JP6949273B2 - Reflection point estimation device and reflection point estimation method - Google Patents

Description

The present invention relates to a reflection point estimation device and a reflection point estimation method.

In the measurement of electromagnetic radiation noise by radio waves having a frequency of 1 GHz or more, the measurement method is defined in the international standard CISPR16-2-3. Further, the anechoic chamber for performing the measurement is defined in Non-Patent Document 1 or Non-Patent Document 2.
Non-Patent Document 1 defines that the anechoic chamber is a non-reflective space in which only electromagnetic radiation noise emitted from the object to be measured and directly reaching the receiving antenna can be measured.
Further, in Non-Patent Document 2, the anechoic chamber is verified by laying a radio wave absorber in a predetermined area on the floor surface of the anechoic chamber or by the SVSWR (Site Voltage Standing Wave Ratio) method specified in Non-Patent Document 1. Therefore, it is required to arrange the radio wave absorber on the floor surface of the anechoic chamber so that the SVSWR value becomes 6 decibels (hereinafter referred to as “dB”) or less.
Further, in recent years, the standard shown in Non-Patent Document 2 has been moving to adopt the time domain SVSWR method using the impulse response obtained from the propagation characteristics between the transmitting antenna and the receiving antenna instead of the SVSWR method.

International Standard CISPR16-1--4: 2010, "Specification for radio disturbance and immunity measuring apparatus and methods --Part 1-4: Radio disturbance and immunity measuring apparatus --Antennas and test sites for radiated disturbance measurements", "IEC", 2010 April, “p.45-p.55” American National Standards ANSI C63.25-2014, "American National Standard for Methods of Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz", "IEEE", July 2014, “P.36-p.40”

However, for example, in the method specified in the American National Standard ANSI C63.25-2014, Section 5.5.1 a) 2), which is Non-Patent Document 2, the anechoic chamber needs to be covered with a radio wave absorber in a predetermined area. be. Therefore, many radio wave absorbers are required, and there is a problem that it takes time or effort to lay or remove the radio wave absorbers.
Further, in order to reduce the SVSWR value to 6 dB or less by the verification by the SVSWR method specified in Non-Patent Document 1, the anechoic chamber is a radio wave absorber on the floor surface corresponding to the intermediate position between the transmitting antenna and the receiving antenna. Is the basis for laying. However, if the SVSWR value does not fall below 6 dB in the state where the radio wave absorber is laid on the floor surface corresponding to the position, the anechoic chamber needs to estimate the reflection position of the electromagnetic radiation noise and add the radio wave absorber. be. In the conventional anechoic chamber, when adding a radio wave absorber, the radio wave absorber is added or the position of the existing radio wave absorber is changed by trial and error. Therefore, it takes time and effort to arrange the radio wave absorber so as to satisfy the condition that the SVSWR value is 6 dB or less under all the verification conditions. This also applies when the time domain SVSWR method is used.

The present invention is for solving the above-mentioned problems, and an object of the present invention is to provide a reflection point estimation device capable of estimating the position of a reflection point on the inner wall of an anechoic chamber of electromagnetic radiation noise.

In the reflection point estimation device according to the present invention, an internal dimension acquisition unit that acquires internal dimension information indicating the internal dimensions of the radio wave anechoic chamber for measuring electromagnetic radiation noise, and an object to be measured inside the radio wave anechoic chamber are arranged in advance. A transmission position acquisition unit that acquires transmission position information indicating the relative position of a transmission antenna that emits a transmission signal in a predetermined area and a predetermined position inside the anechoic chamber. From the reception position acquisition unit that acquires the reception position information indicating the relative position in the anechoic chamber of the reception antenna that receives the transmission signal radiated by the transmission antenna, and the transmission signal received by the reception antenna. The signal identification unit identifies the first transmission signal, which is a transmission signal that is not reflected by the inner wall of the anechoic chamber, and the second transmission signal, which is the transmission signal that is reflected by the inner wall of the anechoic chamber. A signal interval output unit that specifies the time interval between the first transmission signal and the second transmission signal and outputs signal interval information indicating the specified time interval, an internal dimension information acquired by the internal dimension acquisition unit, and transmission. The radio wave of the second transmission signal specified by the signal identification unit based on the transmission position information acquired by the position acquisition unit, the reception position information acquired by the reception position acquisition unit, and the signal interval information output by the signal interval output unit. It is provided with a reflection point estimation unit that estimates the position of the reflection point on the inner wall of the dark room and outputs reflection information indicating the estimated position of the reflection point.

According to the present invention, the position of the reflection point on the inner wall of the anechoic chamber of electromagnetic radiation noise can be estimated.

FIG. 1 is a block diagram showing an example of a configuration of a main part of a measurement system to which the reflection point estimation device according to the first embodiment is applied. FIG. 2 is a block diagram showing an example of the configuration of a main part of the reflection point estimation device according to the first embodiment. FIG. 3 is a diagram showing an example in which the signal information acquired by the signal acquisition unit according to the first embodiment is graphed. FIG. 4 is a block diagram showing an example of the configuration of the main part of the reflection point estimation unit according to the first embodiment. FIG. 5A is a diagram showing an example of the position of the reflection point on the inner wall of the anechoic chamber of the second transmission signal estimated by the reflection point estimation unit in the anechoic chamber in the measurement system shown in FIG. FIG. 5B is an arrow view of the anechoic chamber 10 in the measurement system shown in FIG. 1 from the direction of the arrow X1 shown in FIG. FIG. 5C is an arrow view of the anechoic chamber in the measurement system shown in FIG. 1 from the direction of arrow Y shown in FIG. FIG. 5D is an arrow view of the anechoic chamber in the measurement system shown in FIG. 1 from the direction of arrow X2 shown in FIG. 6A and 6B are diagrams showing an example of the hardware configuration of the main part of the reflection point estimation device according to the first embodiment. FIG. 7 is a flowchart illustrating an example of processing of the reflection point estimation device according to the first embodiment. FIG. 8 is a flowchart illustrating an example of processing of the reflection point estimation unit in the reflection point estimation device according to the first embodiment. FIG. 9 is a block diagram showing an example of the configuration of a main part of the measurement system to which the reflection point estimation device according to the second embodiment is applied. FIG. 10 is a block diagram showing an example of the configuration of a main part of the measurement system to which the reflection point estimation device according to the second embodiment is applied. FIG. 11 is a block diagram showing an example of the configuration of the main part of the reflection point estimation device according to the second embodiment. FIG. 12 is a block diagram showing an example of the configuration of the main part of the reflection point estimation unit according to the second embodiment. FIG. 13A is a diagram showing an example of the position of the reflection point on the inner wall of the anechoic chamber of the second transmission signal estimated by the reflection point estimation unit in the anechoic chamber in the measurement system shown in FIG. FIG. 13B is an arrow view of the anechoic chamber in the measurement system shown in FIG. 9 from the direction of arrow X1 shown in FIG. FIG. 13C is an arrow view of the anechoic chamber in the measurement system shown in FIG. 9 from the direction of arrow Y shown in FIG. FIG. 13D is an arrow view of the anechoic chamber in the measurement system shown in FIG. 9 from the direction of arrow X2 shown in FIG. FIG. 14A is a diagram showing an example of the position of the reflection point on the inner wall of the anechoic chamber of the second transmission signal estimated by the reflection point estimation unit in the anechoic chamber in the measurement system shown in FIG. FIG. 14B is an arrow view of the anechoic chamber in the measurement system shown in FIG. 14A from the direction of arrow X1 shown in FIG. 14A. 14C is an arrow view of the anechoic chamber in the measurement system shown in FIG. 14A from the direction of arrow Y shown in FIG. 14A. FIG. 14D is an arrow view of the anechoic chamber in the measurement system shown in FIG. 14A from the direction of arrow X2 shown in FIG. 14A. FIG. 15 is a flowchart illustrating an example of processing of the reflection point estimation device according to the second embodiment. 16A, 16B, and 16C are flowcharts illustrating an example of processing of the reflection point estimation unit in the reflection point estimation device according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1.
The reflection point estimation device 100 according to the first embodiment will be described with reference to FIGS. 1 to 8.

With reference to FIG. 1, a configuration of a main part of the measurement system 1 to which the reflection point estimation device 100 according to the first embodiment is applied will be described.
FIG. 1 is a block diagram showing an example of the configuration of a main part of the measurement system 1 according to the first embodiment.
The measurement system 1 is composed of an anechoic chamber 10, a transmitting antenna 20, a transmitting cable 21, a receiving antenna 30, a receiving cable 31, a network analyzer 40, a storage device 50, and a reflection point estimation device 100.

The anechoic chamber 10 is a space for measuring electromagnetic radiation noise, which is radio waves emitted by an object to be measured (not shown).
The anechoic chamber 10 is designed so that, for example, the floor, ceiling, and four walls are made of metal plates or the like to block electromagnetic waves from the outside of the anechoic chamber 10 and not to leak the electromagnetic waves to the outside of the anechoic chamber 10. And it was constructed. The anechoic chamber 10 is, for example, a semi-anechoic chamber or the like.
The anechoic chamber 10 shown in FIG. 1 is a view of the anechoic chamber 10 from the ceiling surface to the floor surface.
The anechoic chamber 10 includes a floor surface radio wave absorber 11, a ceiling surface radio wave absorber 12 (not shown in FIG. 1), and a wall surface radio wave absorber 13 inside the anechoic chamber 10.
The floor surface radio wave absorber 11, the ceiling surface radio wave absorber 12, and the wall surface radio wave absorber 13 are composed of a radio wave absorber such as a conductive radio wave absorber, a dielectric radio wave absorber, or a magnetic radio wave absorber.
The floor surface radio wave absorber 11 is attached to the floor surface, which is the inner wall of the anechoic chamber 10, absorbs the radio waves received by the floor surface, and suppresses the reflection of electromagnetic radiation noise on the floor surface.
The ceiling surface radio wave absorber 12 is attached to the ceiling surface, which is the inner wall of the anechoic chamber 10, absorbs the radio waves received by the ceiling surface, and suppresses the reflection of electromagnetic radiation noise on the ceiling surface.
The wall surface radio wave absorber 13 is attached to the four wall surfaces which are the inner walls of the anechoic chamber 10 and absorbs the radio waves received by the wall surface to suppress the reflection of electromagnetic radiation noise on the wall surface.

The transmitting antenna 20 is an antenna for radiating a transmitting signal.
The transmission signal is, for example, a sweep signal in which a sine wave in a predetermined frequency range is continuously changed within a predetermined period.
The transmission cable 21 is a cable for transmitting the transmission signal radiated by the transmission antenna 20 to the transmission antenna 20.
The receiving antenna 30 is an antenna for receiving the transmission signal radiated by the transmitting antenna 20.
The reception cable 31 is a cable for transmitting the transmission signal received by the reception antenna 30.

The network analyzer 40 is a measuring instrument for measuring the propagation characteristics of the transmitted signal transmitted and received between the transmitting antenna 20 and the receiving antenna 30.
The network analyzer 40 outputs a sweep signal as a transmission signal. The transmission signal output by the network analyzer 40 is radiated from the transmission antenna 20 via the transmission cable 21.
The transmission signal received by the receiving antenna 30 is input to the network analyzer 40 via the receiving cable 31.
The network analyzer 40 obtains an impulse response by measuring the propagation characteristics of the transmitted signal transmitted and received between the transmitting antenna 20 and the receiving antenna 30.

Among the measurement systems 1 shown in FIG. 1, the measurement system 1 composed of the anechoic chamber 10, the transmission antenna 20, the transmission cable 21, the reception antenna 30, the reception cable 31, and the network analyzer 40 described above includes the measurement system 1. It is the same as the measurement system 1 by the SVSWR method described in Non-Patent Document 1.
The measurement by the SVSWR method described in Non-Patent Document 1 will be described.
In FIG. 1, the closed curve 14 shown by the alternate long and short dash line including the transmitting antenna 20 indicates the test volume in the SVSWR method described in Non-Patent Document 1. The test volume is an area where the object is placed when measuring the electromagnetic radiation noise emitted by the object.

In the SVSWR method, the SVSWR value is measured by arranging the transmitting antenna 20 at a predetermined position inside the test volume and radiating a predetermined polarized wave from the transmitting antenna 20. In the SVSWR method, there are a plurality of predetermined positions where the transmitting antenna 20 is arranged, and in the SVSWR method, the SVSWR value is measured by radiating a predetermined polarized wave from the transmitting antenna 20 at each of the plurality of predetermined positions. Further, in the SVSWR method, there are a plurality of predetermined polarized waves radiated from the transmitting antenna 20, and in the SVSWR method, the SVSWR value is measured for each of the plurality of predetermined polarized waves at each predetermined position.
When the SVSWR value is measured by radiating a certain polarization from the transmitting antenna 20 arranged at a certain position by the SVSWR method and the SVSWR value becomes larger than 6 dB, the SVSWR at the position and the polarization It is necessary to carry out construction such as adding a radio wave absorber so that the value is 6 dB or less.

In the following description, the network analyzer 40 according to the first embodiment A / D-converts the input transmission signal to generate signal information indicating the transmission signal received by the reception antenna 30. It will be described as assuming that signal information is output.

The storage device 50 displays the internal size information indicating the internal dimensions of the anechoic chamber 10, the transmission position information indicating the relative position of the transmitting antenna 20 in the anechoic chamber 10, and the relative position of the receiving antenna 30 in the anechoic chamber 10. It stores information such as reception position information to be shown.
The storage device 50 outputs the information in accordance with a request from the outside.

The reflection point estimation device 100 transmits the signal reflected by the inner wall of the anechoic chamber 10 based on the signal information acquired from the network analyzer 40, the internal dimension information, the transmission position information, the reception position information, and the like acquired from the storage device 50. The position of the reflection point on the inner wall of the anechoic chamber 10 of the signal (hereinafter referred to as "second transmission signal") is estimated.

The configuration of the main part of the reflection point estimation device 100 according to the first embodiment will be described with reference to FIG.
FIG. 2 is a block diagram showing an example of the configuration of the main part of the reflection point estimation device 100 according to the first embodiment.
The reflection point estimation device 100 includes an internal dimension acquisition unit 101, a transmission position acquisition unit 102, a reception position acquisition unit 103, a signal acquisition unit 110, a signal identification unit 111, a signal interval output unit 120, a propagation distance calculation unit 121, and a reflection point estimation unit. A unit 130 and an estimation information output unit 140 are provided.

The internal dimension acquisition unit 101 acquires internal dimension information indicating the internal dimensions of the anechoic chamber 10 from the storage device 50. The internal dimension information is not limited to the information indicating the internal dimensions of the anechoic chamber 10 as long as it is information indicating the internal structure and size of the anechoic chamber 10.
The transmission position acquisition unit 102 acquires transmission position information indicating a relative position of the transmission antenna 20 in the anechoic chamber 10 from the storage device 50. The relative position in the anechoic chamber 10 is, for example, a point indicated by the coordinates in the Cartesian coordinate system of the three-dimensional space with the predetermined position in the anechoic chamber 10 as the origin.
The reception position acquisition unit 103 acquires reception position information indicating a relative position of the reception antenna 30 in the anechoic chamber 10 from the storage device 50. The relative position in the anechoic chamber 10 is, for example, a point indicated by the coordinates in the Cartesian coordinate system of the three-dimensional space with the predetermined position in the anechoic chamber 10 as the origin.

The signal acquisition unit 110 acquires signal information indicating a transmission signal received by the reception antenna 30 from the network analyzer 40.
The signal identification unit 111 includes a transmission signal (hereinafter referred to as “first transmission signal”) which is a direct wave not reflected by the inner wall of the anechoic chamber 10 and an anechoic chamber 10 from among the transmission signals received by the receiving antenna 30. The transmission signal (hereinafter referred to as "second transmission signal") which is the reflected wave reflected by the inner wall of the above is specified.
Specifically, the signal identification unit 111 identifies the first transmission signal and the second transmission signal by using the signal information acquired by the signal acquisition unit 110 from the network analyzer 40.

A method of specifying the first transmission signal and the second transmission signal will be described with reference to FIG.
FIG. 3 is a diagram showing an example in which the signal information acquired by the signal acquisition unit 110 according to the first embodiment is graphed.
In FIG. 3, the horizontal axis represents the elapsed time, and the vertical axis represents the magnitude of the amplitude of the transmitted signal received by the receiving antenna 30 indicated by the signal information.
FIG. 3 shows three transmission signals.
The first transmission signal is a direct wave in which the transmission signal radiated from the transmission antenna 20 travels on the line segment connecting the transmission antenna 20 and the reception antenna 30 and reaches the reception antenna 30. Therefore, the first transmission signal reaches the receiving antenna 30 earlier than the other two transmission signals shown in FIG.
In FIG. 3, the transmission signal having the largest amplitude is the first transmission signal.

Since the second transmission signal is a transmission signal reflected by the inner wall of the anechoic chamber 10, the propagation distance Dr from the transmission antenna 20 to the reception antenna 30 is longer than the propagation distance Dd of the first transmission signal. Therefore, the second transmission signal reaches the receiving antenna 30 after the first transmission signal.
In FIG. 3, the two transmission signals shown to the right of the first transmission signal are the second transmission signals. Although two transmission signals are shown in FIG. 3, in the first embodiment, the transmission signal shown on the left of the two transmission signals is the second transmission signal to be removed or reduced. It will be explained as a thing.

The signal identification unit 111 identifies the first transmission signal and the second transmission signal based on the time difference between the first transmission signal and the second transmission signal reaching the receiving antenna 30, respectively. That is, the signal identification unit 111 identifies the first transmission signal and the second transmission signal based on the impulse response when the transmission signal radiated from the transmission antenna 20 reaches the reception antenna 30.

The signal interval output unit 120 measures the time interval Δt between the first transmission signal and the second transmission signal specified by the signal identification unit 111, and generates signal interval information indicating the measured time interval Δt.
Specifically, for example, in the signal interval output unit 120, the time when the amplitude of the first transmission signal specified by the signal identification unit 111 is maximum and the amplitude of the second transmission signal specified by the signal identification unit 111 are maximum. The time interval Δt is measured by calculating the difference from the time when the time becomes.

The propagation distance calculation unit 121 signals based on the transmission position information acquired by the transmission position acquisition unit 102, the reception position information acquired by the reception position acquisition unit 103, and the signal interval information output by the signal interval output unit 120. The propagation distance Dr from the transmitting antenna 20 to the receiving antenna 30 of the second transmission signal specified by the specific unit 111 is calculated. The propagation distance calculation unit 121 generates propagation distance information indicating the propagation distance Dr.
Specifically, the propagation distance calculation unit 121 determines the relative position of the transmitting antenna 20 in the anechoic chamber 10 indicated by the transmitting position information and the relative position of the receiving antenna 30 in the anechoic chamber 10 indicated by the receiving position information. Based on this, the distance between the transmitting antenna 20 and the receiving antenna 30, that is, the propagation distance Dd of the first transmission signal is calculated. The propagation distance calculation unit 121 is between the value obtained by multiplying the time interval Δt between the first transmission signal and the second transmission signal specified by the signal interval output unit 120 by the light speed c, and the transmission antenna 20 and the reception antenna 30. The propagation distance Dr from the transmitting antenna 20 to the receiving antenna 30 of the second transmitting signal is calculated by adding the distance of the first transmitting signal, that is, the propagation distance Dd of the first transmitting signal.

The reflection point estimation unit 130 includes internal dimension information acquired by the internal dimension acquisition unit 101, transmission position information acquired by the transmission position acquisition unit 102, reception position information acquired by the reception position acquisition unit 103, and a signal interval output unit. Based on the signal interval information output by 120, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated, and the reflection information indicating the estimated position of the reflection point is generated. do.
Specifically, the reflection point estimation unit 130 includes internal dimension information acquired by the internal dimension acquisition unit 101, transmission position information acquired by the transmission position acquisition unit 102, and reception position information acquired by the reception position acquisition unit 103. , Transmission position information, reception position information, and propagation distance information output by the propagation distance calculation unit 121 based on the signal interval information, in the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111. Estimate the position of the reflection point.

The configuration of the main part of the reflection point estimation unit 130 according to the first embodiment will be described with reference to FIG.
FIG. 4 is a block diagram showing an example of the configuration of the main part of the reflection point estimation unit 130 according to the first embodiment.
The reflection point estimation unit 130 includes a spheroid surface identification unit 131, a closed curve identification unit 132, and a reflection information generation unit 133.
The rotary elliptical surface identification unit 131 is a receiving antenna indicated by the relative position of the transmitting antenna 20 in the anechoic chamber 10 indicated by the transmitting position information acquired by the transmitting position acquisition unit 102 and the receiving position information acquired by the receiving position acquisition unit 103. An ellipse whose focal point is the relative position in the anechoic chamber 10 of 30 and whose major axis is the length of the propagation distance Dr indicated by the propagation distance information output by the propagation distance calculation unit 121 is the major axis of the ellipse. Identify the rotated elliptical plane that has been rotated as the axis of rotation. That is, the spheroid is a set of points at which the sum of the distance from the transmitting antenna 20 to an arbitrary point and the distance from the receiving antenna 30 to the point is equal to the propagation distance Dr.
The closed curve specifying unit 132 specifies a closed curve at which the spheroid surface specified by the spheroid surface specifying unit 131 intersects with the inner wall of the anechoic chamber 10.
The reflection information generation unit 133 estimates that the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 exists in the vicinity of the closed curve including the closed curve specified by the closed curve specifying unit 132. Then, the reflection information including the information indicating the closed curve specified by the closed curve specifying unit 132 is generated.

A spheroidal surface specified by the spheroidal surface specifying unit 131 and a closed curve specified by the closed curve specifying unit 132 will be described with reference to FIG.
FIG. 5A is a diagram showing an example of the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal estimated by the reflection point estimation unit 130 in the anechoic chamber 10 in the measurement system 1 shown in FIG.
FIG. 5B is an arrow view of the anechoic chamber 10 in the measurement system 1 shown in FIG. 1 from the direction of the arrow X1 shown in FIG.
FIG. 5C is an arrow view of the anechoic chamber 10 in the measurement system 1 shown in FIG. 1 from the direction of the arrow Y shown in FIG.
FIG. 5D is an arrow view of the anechoic chamber 10 in the measurement system 1 shown in FIG. 1 from the direction of the arrow X2 shown in FIG.

In FIGS. 5A, 5B, 5C, and 5D, the closed curve 15 shown by the broken line including the transmitting antenna 20 and the receiving antenna 30 is the outer shape of the spheroid surface specified by the spheroid surface specifying unit 131.
In FIG. 5A, the closed curve 16 indicated by the alternate long and short dash line included by the closed curve 15 is the closed curve specified by the closed curve specifying portion 132.
In the reflection point estimation unit 130, the position on the closed curve 16 specified by the closed curve specifying unit 132 on the inner wall, or the vicinity of the position is the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal specifying unit 111. Estimated to be the position.

The estimation information output unit 140 controls to output the reflection information generated by the reflection point estimation unit 130 to an output device (not shown). The output device is, for example, a display output device such as a display.

The hardware configuration of the main part of the reflection point estimation device 100 according to the first embodiment will be described with reference to FIGS. 6A and 6B.
6A and 6B are diagrams showing an example of the hardware configuration of the main part of the reflection point estimation device 100 according to the first embodiment.

As shown in FIG. 6A, the reflection point estimation device 100 is composed of a computer, which has a processor 201 and a memory 202. In the memory 202, the computer is displayed in the internal dimension acquisition unit 101, the transmission position acquisition unit 102, the reception position acquisition unit 103, the signal acquisition unit 110, the signal identification unit 111, the signal interval output unit 120, the propagation distance calculation unit 121, and the reflection. A program for functioning as the point estimation unit 130 and the estimation information output unit 140 is stored. When the processor 201 reads and executes the program stored in the memory 202, the internal dimension acquisition unit 101, the transmission position acquisition unit 102, the reception position acquisition unit 103, the signal acquisition unit 110, the signal identification unit 111, and the signal interval output. A unit 120, a propagation distance calculation unit 121, a reflection point estimation unit 130, and an estimation information output unit 140 are realized.

Further, as shown in FIG. 6B, the reflection point estimation device 100 may be configured by the processing circuit 203. In this case, the internal dimension acquisition unit 101, the transmission position acquisition unit 102, the reception position acquisition unit 103, the signal acquisition unit 110, the signal identification unit 111, the signal interval output unit 120, the propagation distance calculation unit 121, the reflection point estimation unit 130, and The function of the estimation information output unit 140 may be realized by the processing circuit 203.

Further, the reflection point estimation device 100 may be composed of a processor 201, a memory 202, and a processing circuit 203 (not shown). In this case, the internal dimension acquisition unit 101, the transmission position acquisition unit 102, the reception position acquisition unit 103, the signal acquisition unit 110, the signal identification unit 111, the signal interval output unit 120, the propagation distance calculation unit 121, the reflection point estimation unit 130, and Some of the functions of the estimation information output unit 140 may be realized by the processor 201 and the memory 202, and the remaining functions may be realized by the processing circuit 203.

The processor 201 uses, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a microprocessor, a microcontroller, or a DSP (Digital Signal Processor).

The memory 202 uses, for example, a semiconductor memory or a magnetic disk. More specifically, the memory 202 includes a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Online Memory), and an EEPROM (Electrically Memory). State Drive) or HDD (Hard Disk Drive) or the like is used.

The processing circuit 203 includes, for example, an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field-Programmable Logic Device), an FPGA (Field-Programmable Logic Device), or an ASIC (System) System Is used.

The operation of the reflection point estimation device 100 according to the first embodiment will be described with reference to FIGS. 7 and 8.
FIG. 7 is a flowchart illustrating an example of processing of the reflection point estimation device 100 according to the first embodiment.
The reflection point estimation device 100 repeatedly executes the processing of the flowchart each time the transmission signal generated by the network analyzer 40 is radiated from the transmission antenna 20. The radiation from the transmitting antenna 20 of the transmission signal generated by the network analyzer 40 is generated every time the position of the transmitting antenna 20 is changed, or every time the radio wave absorber is added or the like, the anechoic chamber 10 is constructed. This is performed by a person or the like (hereinafter referred to as “user”) operating the network analyzer 40.

First, in step ST701, the internal dimension acquisition unit 101 acquires the internal dimension information.
Next, in step ST702, the transmission position acquisition unit 102 acquires the transmission position information.
Next, in step ST703, the reception position acquisition unit 103 acquires the reception position information.
Next, in step ST704, the signal acquisition unit 110 acquires signal information.

Next, in step ST705, the signal identification unit 111 identifies the first transmission signal and the second transmission signal.
Next, in step ST706, the signal interval output unit 120 measures the time interval Δt between the first transmission signal and the second transmission signal specified by the signal identification unit 111.
Next, in step ST707, the propagation distance calculation unit 121 calculates the propagation distance Dr from the transmission antenna 20 to the reception antenna 30 of the second transmission signal specified by the signal identification unit 111.
Next, in step ST708, the reflection point estimation unit 130 estimates the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111, and the reflection indicating the estimated position of the reflection point. Generate information.
In step ST709, the estimation information output unit 140 outputs the reflection information generated by the reflection point estimation unit 130 to the output device.

After executing the process of step ST709, the reflection point estimation device 100 ends the process of the flowchart, and repeats the process of the flowchart every time the transmission signal generated by the network analyzer 40 is radiated from the transmission antenna 20. do.
In the processing of the flowchart, the processing from step ST701 to step ST703 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST706 is executed.
Further, in the processing of the flowchart, the processing of step ST704 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST705 is executed.
Further, in the processing of the flowchart, the processing of step ST705 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST706 is executed.

FIG. 8 is a flowchart illustrating an example of processing of the reflection point estimation unit 130 in the reflection point estimation device 100 according to the first embodiment. That is, FIG. 8 is a flowchart illustrating an example of the process of step ST708 shown in FIG.

First, in step ST801, the spheroid surface specifying unit 131 specifies the spheroid surface.
Next, in step ST802, the closed curve specifying unit 132 specifies a closed curve at which the spheroidal surface specified by the spheroidal surface specifying unit 131 intersects with the inner wall of the anechoic chamber 10.
Next, in step ST803, the reflection information generation unit 133 determines that the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is a closed curve including the closed curve specified by the closed curve specifying unit 132. It is presumed that it exists in the vicinity of the closed curve, and the reflection information including the information indicating the closed curve specified by the closed curve specifying unit 132 is generated.
After executing the process of step ST803, the reflection point estimation unit 130 ends the process of the flowchart.

As described above, the reflection point estimation device 100 includes an internal dimension acquisition unit 101 that acquires internal dimension information indicating the internal dimensions of the radio wave anechoic chamber 10 for measuring electromagnetic radiation noise, and an object to be measured inside the radio wave anechoic chamber 10. The transmission position acquisition unit 102 that acquires the transmission position information indicating the relative position of the transmission antenna 20 that emits the transmission signal in the anechoic chamber 10 and the anechoic chamber. A reception position acquisition unit that acquires reception position information indicating a relative position in an anechoic chamber 10 of a reception antenna 30 that receives a transmission signal radiated by a transmission antenna 20 and is arranged at a predetermined position inside the 10. Of the transmission signals received by the receiving antenna 30 and 103, the first transmission signal, which is a transmission signal not reflected by the inner wall of the anechoic chamber 10, and the second transmission, which is a transmission signal reflected by the inner wall of the anechoic chamber 10. The signal identification unit 111 that identifies the signal and the time interval Δt between the first transmission signal and the second transmission signal specified by the signal identification unit 111 are specified, and signal interval information indicating the specified time interval Δt is output. Signal interval output unit 120, internal dimension information acquired by the internal dimension acquisition unit 101, transmission position information acquired by the transmission position acquisition unit 102, reception position information acquired by the reception position acquisition unit 103, and signal interval output. Based on the signal interval information output by the unit 120, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated, and the reflection information indicating the estimated position of the reflection point is obtained. A reflection point estimation unit 130 for output is provided.

With this configuration, the reflection point estimation device 100 can estimate the position of the reflection point on the inner wall of the anechoic chamber 10 of the electromagnetic radiation noise.

Further, in addition to the above configuration, the reflection point estimation device 100 outputs the transmission position information acquired by the transmission position acquisition unit 102, the reception position information acquired by the reception position acquisition unit 103, and the signal interval output unit 120. Propagation that calculates the propagation distance Dr from the transmission antenna 20 to the reception antenna 30 of the second transmission signal specified by the signal identification unit 111 based on the signal interval information, and outputs the propagation distance information indicating the calculated propagation distance Dr. The distance calculation unit 121 is provided, and the reflection point estimation unit 130 acquires the internal dimension information acquired by the internal dimension acquisition unit 101, the transmission position information acquired by the transmission position acquisition unit 102, and the reception position acquired by the reception position acquisition unit 103. Based on the information and the propagation distance information output by the propagation distance calculation unit 121, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated.

With this configuration, the reflection point estimation device 100 can accurately estimate the position of the reflection point on the inner wall of the anechoic chamber 10 of the electromagnetic radiation noise.

Further, in the reflection point estimation device 100, in addition to the above-described configuration, the reflection point estimation unit 130 determines the relative position of the transmission antenna 20 in the anechoic chamber 10 indicated by the transmission position information acquired by the transmission position acquisition unit 102. The propagation distance Dr of the propagation distance Dr. A rotating ellipse surface obtained by rotating an ellipse having a major axis as a major axis with the major axis of the ellipse as a rotation axis is specified, and the reflection point estimation unit 130 has a closed curve at which the rotation ellipse surface and the inner wall of the anechoic chamber 10 intersect. The position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated by specifying the above.

With this configuration, the reflection point estimation device 100 can accurately estimate the position of the reflection point on the inner wall of the anechoic chamber 10 of the electromagnetic radiation noise.
With this configuration, the reflection point estimation device 100 reflects the second transmission signal on the inner wall of the anechoic chamber 10, especially when the electromagnetic radiation noise is a reflected wave reflected only once on the inner wall of the anechoic chamber 10. The position of the reflected point can be estimated accurately.

In the first embodiment, the internal dimension acquisition unit 101 has been described as acquiring the internal dimension information from the storage device 50, but the present invention is not limited to this. The internal dimension acquisition unit 101 may acquire the internal dimension information by receiving the internal dimension information input by the user by operating an input device (not shown) from the input device, for example.
Further, in the first embodiment, the transmission position acquisition unit 102 has been described as acquiring the transmission position information from the storage device 50, but the present invention is not limited to this. The transmission position acquisition unit 102 may acquire the transmission position information by receiving the transmission position information input by the user by operating an input device (not shown) from the input device, for example.
Further, in the first embodiment, the reception position acquisition unit 103 has been described as acquiring the reception position information from the storage device 50, but the present invention is not limited to this. The reception position acquisition unit 103 may acquire the reception position information by receiving the reception position information input by the user by operating an input device (not shown) from the input device, for example.

Further, in the first embodiment, the signal acquisition unit 110 has been described as acquiring signal information from the network analyzer 40, but the present invention is not limited to this. For example, the signal acquisition unit 110 may acquire the signal information stored in the storage device 50 by the network analyzer 40 from the storage device 50.

The user temporarily arranges the radio wave absorber at the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal indicated by the reflection information output by the reflection point estimation device 100, and removes or reduces the second transmission signal again. When the second transmission signal is a reflected wave reflected only once on the inner wall of the anechoic chamber 10, the position of the reflection point reflected by the second transmission signal on the inner wall of the anechoic chamber 10 can be accurately specified. .. Therefore, the user can adjust the SVSWR value to 6 dB or less in a shorter time and with less radio wave absorber than in the conventional trial and error arrangement study of the radio wave absorber.

Embodiment 2.
The reflection point estimation device 100a according to the second embodiment will be described with reference to FIGS. 9 to 16. An example will be described.
A configuration of a main part of the measurement system 1a to which the reflection point estimation device 100a according to the second embodiment is applied will be described with reference to FIGS. 9 and 10.
9 and 10 are block diagrams showing an example of the configuration of the main part of the measurement system 1a according to the second embodiment.
In the measurement system 1a according to the second embodiment, the movable radio wave absorber 60 is added to the measurement system 1 according to the first embodiment, and the reflection point estimation device 100 is changed to the reflection point estimation device 100a.
In the configuration of the measurement system 1a according to the second embodiment, the same components as those of the measurement system 1 according to the first embodiment are designated by the same reference numerals and duplicated description will be omitted. That is, the description of the configuration of FIG. 9 or FIG. 10 having the same reference numerals as those shown in FIG. 1 will be omitted.

The measurement system 1a includes an anechoic chamber 10, a movable radio wave absorber 60, a transmitting antenna 20, a transmitting cable 21, a receiving antenna 30, a receiving cable 31, a network analyzer 40, a storage device 50, and a reflection point estimation device 100a. Will be done.
The movable radio wave absorber 60 is made of a radio wave absorber such as a conductive radio wave absorber, a dielectric radio wave absorber, or a magnetic radio wave absorber, and is located inside the anechoic chamber 10 at a position away from the inner wall of the anechoic chamber 10. Placed in.

The movable radio wave absorber 60 is arranged in a direction capable of absorbing a direct wave of a transmission signal radiated from the transmission antenna 20. As an example, the movable radio wave absorber 60 shown in FIG. 9 is arranged in the vicinity of the transmitting antenna 20. The position where the movable radio wave absorber 60 shown in FIG. 9 is arranged is an example, and is not limited to the position shown in FIG.

Further, the movable radio wave absorber 60 may be arranged in a direction in which the reflected wave of the transmission signal received by the receiving antenna 30 can be absorbed. The movable radio wave absorber 60 shown in FIG. 10 is arranged in the vicinity of the receiving antenna 30. The position where the movable radio wave absorber 60 shown in FIG. 10 is arranged is an example, and is not limited to the position shown in FIG.
In the following description, when the movable radio wave absorber 60 is arranged inside the anechoic chamber 10, the movable radio wave absorber 60 is in a direction capable of absorbing the direct wave of the transmission signal radiated from the transmitting antenna 20 or. , It is assumed that the receiving antenna 30 is arranged in any direction in which the reflected wave of the transmitted signal received can be absorbed.

The storage device 50 includes internal size information, transmission position information, reception position information, and a relative region of the movable radio wave absorber 60 arranged inside the anechoic chamber 10 in the anechoic chamber 10, and the movable type. Information such as radio wave absorber information indicating the direction in which the radio wave absorber 60 is directed is stored.

The configuration of the main part of the reflection point estimation device 100a according to the second embodiment will be described with reference to FIG.
FIG. 11 is a block diagram showing an example of the configuration of the main part of the reflection point estimation device 100a according to the second embodiment.
In the reflection point estimation device 100a according to the second embodiment, a radio wave absorber acquisition unit 150 and a radio wave absorber determination unit 151 are added to the reflection point estimation device 100 according to the first embodiment, and the reflection point estimation unit 130 is a reflection point. It has been changed to the estimation unit 130a.
In the configuration of the measurement system 1a according to the second embodiment, the same components as those of the measurement system 1 according to the first embodiment are designated by the same reference numerals and duplicated description will be omitted. That is, the description of the configuration of FIG. 11 having the same reference numerals as those shown in FIG. 2 will be omitted.
The reflection point estimation device 100a includes an internal dimension acquisition unit 101, a transmission position acquisition unit 102, a reception position acquisition unit 103, a signal acquisition unit 110, a signal identification unit 111, a radio wave absorber acquisition unit 150, a radio wave absorber determination unit 151, and a signal. It includes an interval output unit 120, a propagation distance calculation unit 121, a reflection point estimation unit 130a, and an estimation information output unit 140.

The radio wave absorber acquisition unit 150 provides radio wave absorber information indicating a relative region in the radio wave anechoic chamber 10 of the movable radio wave absorber 60 arranged at a position away from the inner wall of the radio wave anechoic chamber 10 inside the radio wave absorber 10. Obtained from the storage device 50. The relative region in the anechoic chamber 10 is, for example, a region indicated by the coordinates in the Cartesian coordinate system of the three-dimensional space with the predetermined position in the anechoic chamber 10 as the origin.
The radio wave absorber determination unit 151 determines whether or not the movable radio wave absorber 60 is arranged inside the anechoic chamber 10 based on the radio wave absorber information acquired by the radio wave absorber acquisition unit 150.
When the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is not arranged inside the anechoic chamber 10, for example, the signal interval output unit 120 and the propagation distance calculation unit 121 are described in the first embodiment. The same operation as that of the signal interval output unit 120 and the propagation distance calculation unit 121 is performed.

When the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is arranged inside the anechoic chamber 10, the radio wave absorber determination unit 151 and the transmission position information acquired by the transmission position acquisition unit 102 Based on the reception position information acquired by the reception position acquisition unit 103 and the radio wave absorber information acquired by the radio wave absorber acquisition unit 150, the movable radio wave absorber 60 of the transmission signal radiated from the transmission antenna 20 It is determined whether or not the arrangement is directed so that the direct wave can be absorbed.
When the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is arranged in a direction capable of absorbing the direct wave of the transmission signal radiated from the transmission antenna 20, the reflection point estimation unit 130a determines. The signal identification unit 111 is specified based on the internal dimension information acquired by the internal dimension acquisition unit 101, the transmission position information acquired by the transmission position acquisition unit 102, and the radio wave absorber information acquired by the radio wave absorber acquisition unit 150. The position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal is estimated, and the reflection information indicating the position of the estimated reflection point is output.

Specifically, the reflection point estimation unit 130a has the relative position of the transmission antenna 20 in the anechoic chamber 10 indicated by the transmission position information acquired by the transmission position acquisition unit 102 as the apex, and the radio wave absorber acquisition unit 150 has the radio wave absorber acquisition unit 150 as the apex. The conical surface of the conical surface including the outer periphery of the relative region in the anechoic chamber 10 of the movable radio wave absorber 60 indicated by the acquired radio wave absorber information is specified.
Further, the reflection point estimation unit 130a identifies the closed curve at which the conical surface intersects the inner wall of the anechoic chamber 10, so that the reflection point of the second transmission signal specified by the signal identification unit 111 on the inner wall of the anechoic chamber 10 Estimate the position.
More specifically, for example, when the second transmission signal specified by the signal identification unit 111 is reduced due to the arrangement of the movable radio wave absorber 60, the reflection point estimation unit 130a is positioned on the closed curve. Or, it is estimated that there is a reflection point inside the closed curve. Further, for example, when the second transmission signal specified by the signal identification unit 111 is not reduced or increased due to the arrangement of the movable radio wave absorber 60, the reflection point estimation unit 130a reflects the second transmission signal outside the closed curve. Estimate that there is a point.

When the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is not arranged in a direction capable of absorbing the direct wave of the transmission signal radiated from the transmission antenna 20, that is, the radio wave absorber determination unit When it is determined that the movable radio wave absorber 60 is arranged in a direction in which the movable radio wave absorber 60 can absorb the reflected wave of the transmission signal received by the receiving antenna 30, the reflection point estimation unit 130a has the internal dimension acquisition unit 101. The second transmission signal specified by the signal identification unit 111 based on the acquired internal dimension information, the reception position information acquired by the reception position acquisition unit 103, and the radio wave absorber information acquired by the radio wave absorber acquisition unit 150. The position of the reflection point on the inner wall of the anechoic chamber 10 is estimated, and the reflection information indicating the estimated position of the reflection point is output.

Specifically, the reflection point estimation unit 130a has the relative position of the reception antenna 30 in the anechoic chamber 10 indicated by the reception position information acquired by the reception position acquisition unit 103 as the apex, and the radio wave absorber acquisition unit 150 has the radio wave absorber acquisition unit 150 as the apex. The conical surface of the conical surface including the outer periphery of the relative region of the anechoic chamber 10 of the movable radio wave absorber 60 indicated by the acquired radio wave absorber information is specified.
Further, the reflection point estimation unit 130a identifies the closed curve at which the conical surface intersects the inner wall of the anechoic chamber 10, so that the reflection point of the second transmission signal specified by the signal identification unit 111 on the inner wall of the anechoic chamber 10 Estimate the position.
More specifically, for example, when the second transmission signal specified by the signal identification unit 111 is reduced due to the arrangement of the movable radio wave absorber 60, the reflection point estimation unit 130a is positioned on the closed curve. Or, it is estimated that there is a reflection point inside the closed curve. Further, for example, when the second transmission signal specified by the signal identification unit 111 is not reduced or increased due to the arrangement of the movable radio wave absorber 60, the reflection point estimation unit 130a reflects the second transmission signal outside the closed curve. Estimate that there is a point.

With reference to FIG. 12, the configuration of the main part of the reflection point estimation unit 130a according to the second embodiment will be described.
FIG. 12 is a block diagram showing an example of the configuration of the main part of the reflection point estimation unit 130a according to the second embodiment.

The reflection point estimation unit 130a includes a spheroid surface identification unit 131, a conical surface identification unit 134, a closed curve identification unit 132a, and a reflection information generation unit 133a.
When the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is not arranged inside the anechoic chamber 10, the spheroid surface identification unit 131 is a spheroidal ellipsoid as shown in the first embodiment. Identify the face. Since the method of specifying the spheroid surface has been described in the first embodiment, the description thereof will be omitted.

In the cone surface identification unit 134, the radio wave absorber determination unit 151 is for transmitting signals in which the movable radio wave absorber 60 is arranged inside the anechoic chamber 10 and the movable radio wave absorber 60 is radiated from the transmitting antenna 20. When it is determined that the radio wave is arranged in a direction in which the direct wave can be absorbed, the relative position of the transmission antenna 20 indicated by the transmission position information acquired by the transmission position acquisition unit 102 in the anechoic chamber 10 is set as the apex and the radio wave. The cone surface of the cone including the outer periphery of the relative region in the anechoic chamber 10 of the movable radio wave absorber 60 indicated by the radio wave absorber information acquired by the absorber acquisition unit 150 is specified.
In the cone surface specifying unit 134, the radio wave absorber determination unit 151 reflects the transmission signal received by the receiving antenna 30 when the movable radio wave absorber 60 is arranged inside the anechoic chamber 10. When it is determined that the radio wave is arranged in a direction in which the wave can be absorbed, the relative position of the receiving antenna 30 indicated by the reception position information acquired by the reception position acquisition unit 103 in the anechoic chamber 10 is set as the apex and the radio wave is absorbed. The cone surface of the cone including the outer periphery of the relative region in the anechoic chamber 10 of the movable radio wave absorber 60 indicated by the radio wave absorber information acquired by the body acquisition unit 150 is specified.

The closed curve specifying unit 132a specifies a closed curve at which the spheroid surface specified by the spheroidal surface specifying unit 131 or the conical surface specified by the conical surface specifying unit 134 intersects with the inner wall of the anechoic chamber 10.
In the reflection information generation unit 133a, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is the position on the closed curve including the closed curve specified by the closed curve specifying unit 132a, or the position of the closed curve. It is presumed that it exists inside or outside, and reflection information including information indicating the closed curve specified by the closed curve specifying unit 132a is generated.

The conical surface specified by the conical surface specifying portion 134 and the closed curve specified by the closed curve specifying portion 132a will be described with reference to FIGS. 13 and 14.
FIG. 13A is a diagram showing an example of the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal estimated by the reflection point estimation unit 130a in the anechoic chamber 10 in the measurement system 1a shown in FIG.
FIG. 13B is an arrow view of the anechoic chamber 10 in the measurement system 1a shown in FIG. 9 from the direction of the arrow X1 shown in FIG.
FIG. 13C is an arrow view of the anechoic chamber 10 in the measurement system 1a shown in FIG. 9 from the direction of the arrow Y shown in FIG.
FIG. 13D is an arrow view of the anechoic chamber 10 in the measurement system 1a shown in FIG. 9 from the direction of the arrow X2 shown in FIG.

In FIGS. 13A and 13B, the line segment indicated by the broken line extending from the transmitting antenna 20 toward the inner wall of the anechoic chamber 10 is the conical surface specified by the conical surface specifying portion 134.
In FIG. 13C, the closed curve 17 indicated by the alternate long and short dash line including the transmitting antenna 20 is the closed curve specified by the closed curve specifying portion 132a. Although the closed curve 17 is shown by a rectangle in FIG. 13C, this is an example, and the shape of the closed curve 17 is not limited to the rectangle. The shape of the closed curve 17 is determined by the region of the movable radio wave absorber 60, the positional relationship between the movable radio wave absorber 60 and the transmitting antenna 20, the shape of the anechoic chamber 10, and the like.

FIG. 14A is a diagram showing an example of the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal estimated by the reflection point estimation unit 130a in the anechoic chamber 10 in the measurement system 1a shown in FIG.
FIG. 14B is an arrow view of the anechoic chamber 10 in the measurement system 1a shown in FIG. 14A from the direction of the arrow X1 shown in FIG. 14A.
14C is an arrow view of the anechoic chamber 10 in the measurement system 1a shown in FIG. 14A from the direction of the arrow Y shown in FIG. 14A.
FIG. 14D is an arrow view of the anechoic chamber 10 in the measurement system 1a shown in FIG. 14A from the direction of the arrow X2 shown in FIG. 14A.

In FIGS. 14A and 14C, the line segment indicated by the broken line extending from the receiving antenna 30 toward the inner wall of the anechoic chamber 10 is the conical surface specified by the conical surface specifying portion 134.
In FIG. 14B, the closed curve 18 indicated by the alternate long and short dash line including the transmitting antenna 20 is the closed curve specified by the closed curve specifying portion 132a. Although the closed curve 18 is shown by a rectangle in FIG. 14B, this is an example, and the shape of the closed curve 18 is not limited to the rectangle. The shape of the closed curve 18 is determined by the region of the movable radio wave absorber 60, the positional relationship between the movable radio wave absorber 60 and the receiving antenna 30, the shape of the anechoic chamber 10, and the like.

The internal dimension acquisition unit 101, the transmission position acquisition unit 102, the reception position acquisition unit 103, the signal acquisition unit 110, the signal identification unit 111, the radio wave absorber acquisition unit 150, and the radio wave in the reflection point estimation device 100a according to the second embodiment. Each function of the absorber determination unit 151, the signal interval output unit 120, the propagation distance calculation unit 121, the reflection point estimation unit 130a, and the estimation information output unit 140 is shown in FIGS. 6A and 6B in the first embodiment. It may be realized by the processor 201 and the memory 202 in the hardware configuration, or may be realized by the processing circuit 203.

The operation of the reflection point estimation device 100a according to the second embodiment will be described with reference to FIGS. 15 and 16.
FIG. 15 is a flowchart illustrating an example of processing of the reflection point estimation device 100a according to the second embodiment.
The reflection point estimation device 100a repeats the processing of the flowchart every time the transmission signal generated by the network analyzer 40 is radiated from the transmission antenna 20. The radiation of the transmission signal generated by the network analyzer 40 from the transmission antenna 20 is, for example, every time the position of the transmission antenna 20 is changed, every time a radio wave absorber is added, or the like, or the movable radio wave absorber 60. This is performed by the user operating the network analyzer 40 each time the position is changed or the position is changed.

First, in step ST1501, the internal dimension acquisition unit 101 acquires the internal dimension information.
Next, in step ST1502, the transmission position acquisition unit 102 acquires the transmission position information.
Next, in step ST1503, the reception position acquisition unit 103 acquires the reception position information.
Next, in step ST1504, the signal acquisition unit 110 acquires signal information.
Next, in step ST1505, the signal identification unit 111 identifies the first transmission signal and the second transmission signal.
Next, in step ST1506, the radio wave absorber acquisition unit 150 acquires the radio wave absorber information.
Next, in step ST1507, the radio wave absorber determination unit 151 determines whether or not the movable radio wave absorber 60 is arranged.

When the radio wave absorber determination unit 151 determines in step ST1507 that the movable radio wave absorber 60 is not arranged, the signal interval output unit 120 is the first specified by the signal identification unit 111 in step ST1511. The time interval Δt between the transmission signal and the second transmission signal is measured.
After the processing of step ST1511, in step ST1512, the propagation distance calculation unit 121 calculates the propagation distance Dr from the transmission antenna 20 to the reception antenna 30 of the second transmission signal specified by the signal identification unit 111.
After the processing of step ST1512, in step ST1513, the reflection point estimation unit 130a estimates the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111, and the estimated reflection point of the reflection point. Generates reflection information indicating the position.

When the radio wave absorber determination unit 151 determines in step ST1507 that the movable radio wave absorber 60 is arranged, in step ST1508, the radio wave absorber determination unit 151 transmits the movable radio wave absorber 60. It is determined whether or not the antenna 20 is arranged so as to be able to absorb the direct wave of the transmission signal radiated from the antenna 20.
When the radio wave absorber determination unit 151 determines in step ST1508 that the movable radio wave absorber 60 is arranged in a direction capable of absorbing the direct wave of the transmission signal radiated from the transmission antenna 20, step ST1521 The reflection point estimation unit 130a estimates the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111, and generates reflection information indicating the estimated position of the reflection point.
When it is determined in step ST1508 that the radio wave absorber determination unit 151 is not arranged in a direction in which the movable radio wave absorber 60 can absorb the direct wave of the transmission signal radiated from the transmission antenna 20, that is, When the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is arranged in a direction capable of absorbing the reflected wave of the transmission signal received by the receiving antenna 30, the reflection point is estimated in step ST1531. The unit 130a estimates the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111, and generates reflection information indicating the position of the estimated reflection point.
After the processing of step ST1513, step ST1521, or step ST1531, in step ST1541, the estimation information output unit 140 outputs the reflection information generated by the reflection point estimation unit 130a to the output device.
After executing the process of step ST1541, the reflection point estimation device 100a ends the process of the flowchart, and repeats the process of the flowchart every time the transmission signal generated by the network analyzer 40 is radiated from the transmission antenna 20. do.

In the processing of the flowchart, the processing of step ST1501 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST1511, step ST1521 or step ST1531 is executed.
Further, in the processing of the flowchart, the processing of step ST1502 or step ST1502 may not be executed in the order shown in the flowchart as long as the processing of step ST1502 is processed before the processing of step ST1507 is executed.
Further, in the processing of the flowchart, the processing of step ST1504 may not be executed in the order shown in the flowchart as long as it is processed before the processing of step ST1505 is executed.

Further, in the processing of the flowchart, the processing of step ST1505 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST1511, step ST1521 or step ST1531 is executed.
Further, in the processing of the flowchart, the processing of step ST1506 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST1507 is executed.
Further, in the processing of the flowchart, the processing of step ST1507 is not limited to the order shown in the flowchart as long as it is processed before the processing of step ST1511, step ST1521 or step ST1531 is executed.

16A, 16B, and 16C are flowcharts illustrating an example of processing of the reflection point estimation unit 130a in the reflection point estimation device 100a according to the second embodiment. Specifically, FIG. 16A is a flowchart illustrating an example of the process of step ST1513 shown in FIG. FIG. 16B is a flowchart illustrating an example of the process of step ST1521 shown in FIG. FIG. 16B is a flowchart illustrating an example of the process of step ST1531 shown in FIG.

In FIG. 16A, that is, when the radio wave absorber determination unit 151 determines that the movable radio wave absorber 60 is not arranged, first, in step ST1601, the spheroid surface identification unit 131 determines the spheroid surface. Identify.
Next, in step ST1602, the closed curve specifying unit 132a specifies a closed curve at which the spheroidal surface specified by the spheroidal surface specifying unit 131 intersects with the inner wall of the anechoic chamber 10.
Next, in step ST1603, the reflection information generation unit 133a has the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 near the closed curve including the closed curve. It is presumed that the reflection information including the information indicating the closed curve is generated.
After executing the process of step ST1603, the reflection point estimation unit 130a ends the process of the flowchart.

In FIG. 16B, that is, in the radio wave absorber determination unit 151, the movable radio wave absorber 60 is arranged inside the anechoic chamber 10, and the movable radio wave absorber 60 directly emits a transmission signal emitted from the transmission antenna 20. When it is determined that the conical surface identification portion 134 is arranged in a direction capable of absorbing waves, first, in step ST1611, the conical surface specifying portion 134 has the position of the transmitting antenna 20 as the apex and the movable radio wave absorber 60. Identify the conical surface of the conical that includes the outer circumference of the region in the conical surface.
Next, in step ST1612, the closed curve specifying portion 132a identifies the closed curve at which the conical surface specified by the conical surface specifying portion 134 intersects with the inner wall of the anechoic chamber 10.
Next, in step ST1613, in the reflection information generation unit 133a, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is located on the closed curve or inside the closed curve. Alternatively, it is presumed that it exists on the outside, and reflection information including information indicating the closed curve is generated.
The reflection point estimation unit 130a ends the processing of the flowchart after executing the processing of step ST1613.

In FIG. 16C, that is, in the radio wave absorber determination unit 151, the movable radio wave absorber 60 is arranged inside the anechoic chamber 10, and the movable radio wave absorber 60 directly emits a transmission signal emitted from the transmission antenna 20. When it is determined that the wave is not arranged in a direction capable of absorbing waves, that is, in a direction in which the radio wave absorber determination unit 151 can absorb the reflected wave of the transmission signal received by the receiving antenna 30 by the movable radio wave absorber 60. When it is determined that they are arranged toward each other, first, in step ST1621, the cone surface specifying portion 134 has the position of the receiving antenna 30 as the apex and the outer periphery of the region of the movable radio wave absorber 60 is the cone surface. Identify the cone surface of the cone contained in.
Next, in step ST1622, the closed curve specifying portion 132a identifies the closed curve at which the conical surface specified by the conical surface specifying portion 134 intersects with the inner wall of the anechoic chamber 10.
Next, in step ST1623, in the reflection information generation unit 133a, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is located on the closed curve or inside the closed curve. Alternatively, it is presumed that it exists on the outside, and reflection information including information indicating the closed curve is generated.
The reflection point estimation unit 130a ends the processing of the flowchart after executing the processing of step ST1623.

The reflection point estimation device 100a according to the second embodiment has been described as having the function of the reflection point estimation device 100 according to the first embodiment, but the present invention is not limited to this. For example, the reflection point estimation device 100a may not have the function of the reflection point estimation device 100 according to the first embodiment.

Further, in the reflection point estimation device 100a according to the second embodiment, the conical surface of the conical surface having the position of the transmitting antenna 20 as the apex and the outer periphery of the region of the movable radio wave absorber 60 as the conical surface, and the anechoic chamber Information indicating the closed curve by identifying the closed curve that intersects the inner wall of 10 and presuming that the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal exists outside the closed curve including the closed curve. A function of generating reflection information including the above (hereinafter referred to as "first function"), and a conical cone having the position of the receiving antenna 30 as the apex and including the outer periphery of the region of the movable radio wave absorber 60 in the conical surface. The closed curve where the surface and the inner wall of the anechoic chamber 10 intersect is specified, and it is estimated that the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal exists outside the closed curve including the closed curve. Although it has been described as having a function of generating reflection information including information indicating the closed curve (hereinafter referred to as “second function”), the present invention is not limited to this. For example, the reflection point estimation device 100a may have either a first function or a second function.

When the reflection point estimation device 100a has only the first function, the reflection point estimation device 100a has an internal dimension acquisition unit 101, a transmission position acquisition unit 102, a reception position acquisition unit 103, a radio wave absorber acquisition unit 150, and a signal acquisition unit 110. , The signal identification unit 111, the reflection point estimation unit 130a, and the estimation information output unit 140 may be provided. Further, in this case, the reflection point estimation unit 130a may have a conical surface identification unit 134, a closed curve identification unit 132a, and a reflection information generation unit 133a.
When the reflection point estimation device 100a has only the second function, the reflection point estimation device 100a has an internal dimension acquisition unit 101, a transmission position acquisition unit 102, a reception position acquisition unit 103, a radio wave absorber acquisition unit 150, and a signal acquisition unit. Any unit may include a unit 110, a signal identification unit 111, a reflection point estimation unit 130a, and an estimation information output unit 140. Further, in this case, the reflection point estimation unit 130a may have a conical surface identification unit 134, a closed curve identification unit 132a, and a reflection information generation unit 133a.

In the second embodiment, the radio wave absorber acquisition unit 150 has been described as acquiring the radio wave absorber information from the storage device 50, but the present invention is not limited to this. The radio wave absorber acquisition unit 150 may acquire the radio wave absorber information by receiving the radio wave absorber information input by the user by operating an input device (not shown) from the input device, for example.

As described above, the reflection point estimation device 100a includes the inner size acquisition unit 101 that acquires the inner size information indicating the inner size of the anechoic chamber 10 for measuring the electromagnetic radiation noise, and the object to be measured inside the anechoic chamber 10. The transmission position acquisition unit 102 that acquires transmission position information indicating the relative position of the transmission antenna 20 that emits the transmission signal in the anechoic chamber 10 and the anechoic chamber. A reception position acquisition unit that acquires reception position information indicating a relative position in the anechoic chamber 10 of a reception antenna 30 that receives a transmission signal radiated by the transmission antenna 20 and is arranged at a predetermined position inside the 10. Of the transmission signals received by the receiving antenna 30 and 103, the first transmission signal, which is a transmission signal not reflected by the inner wall of the anechoic chamber 10, and the second transmission, which is the transmission signal reflected by the inner wall of the anechoic chamber 10. Radio wave absorption indicating a relative region in the anechoic chamber 10 of the signal identification unit 111 for specifying the signal and the movable radio wave absorber 60 arranged at a position away from the inner wall of the anechoic chamber 10 inside the anechoic chamber 10. The radio wave absorber acquisition unit 150 that acquires body information, the internal dimension information acquired by the internal dimension acquisition unit 101, the transmission position information acquired by the transmission position acquisition unit 102, and the radio wave absorption acquired by the radio wave absorber acquisition unit 150. Based on the body information, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated, and the reflection point estimation unit 130a that outputs the reflection information indicating the estimated position of the reflection point is output. And equipped with.

With this configuration, in the reflection point estimation device 100a, even if the electromagnetic radiation noise is a reflected wave reflected not only once but twice or more on the inner wall of the anechoic chamber 10, the electromagnetic radiation noise is reflected in the anechoic chamber 10 The position of the first reflection point can be accurately estimated on the inner wall of the.

Further, in the above configuration, the reflection point estimation unit 130a has the relative position of the transmission antenna 20 in the anechoic chamber 10 indicated by the transmission position information acquired by the transmission position acquisition unit 102 as the apex, and the radio wave absorber acquisition unit The conical surface of the conical surface including the outer periphery of the relative region in the anechoic chamber 10 of the movable radio wave absorber 60 indicated by the radio wave absorber information acquired by 150 is specified, and the reflection point estimation unit 130a identifies the conical surface. By specifying the closed curve where the surface and the inner wall of the anechoic chamber 10 intersect, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal specifying unit 111 is estimated.

With this configuration, in the reflection point estimation device 100a, even if the electromagnetic radiation noise is a reflected wave reflected not only once but twice or more on the inner wall of the anechoic chamber 10, the electromagnetic radiation noise is reflected in the anechoic chamber 10 The position of the first reflection point can be accurately estimated on the inner wall of the.

Further, in the above configuration, when the movable radio wave absorber 60 is arranged in a direction capable of absorbing the direct wave of the transmission signal radiated from the transmission antenna 20, the reflection point estimation unit 130a moves to the transmission position. The movable radio wave absorber 60 whose apex is the relative position of the transmission antenna 20 indicated by the transmission position information acquired by the acquisition unit 102 in the anechoic chamber 10 and which is indicated by the radio wave absorber information acquired by the radio wave absorber acquisition unit 150. The cone surface of the cone including the outer periphery of the relative region in the anechoic chamber 10 is specified, and the reflection point estimation unit 130a specifies the closed curve where the cone surface and the inner wall of the anechoic chamber 10 intersect. Therefore, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated.

With this configuration, in the reflection point estimation device 100a, even if the electromagnetic radiation noise is a reflected wave reflected not only once but twice or more on the inner wall of the anechoic chamber 10, the electromagnetic radiation noise is reflected in the anechoic chamber 10 The position of the first reflection point can be accurately estimated on the inner wall of the.

A method of using the reflection point estimation device 100a configured as described above will be described.
For example, the user arranges the movable radio wave absorber 60 at a position inside the anechoic chamber 10 away from the inner wall of the anechoic chamber 10 (hereinafter referred to as "first position"), and emits a transmission signal from the transmission antenna 20. .. The reflection point estimation device 100a determines whether or not there is a second transmission signal to be removed or reduced at the first position. For example, the signal identification unit 111 that specifies the second transmission signal determines whether or not there is a second transmission signal to be removed or reduced.
When it is determined that the second transmission signal does not exist, for example, the reflection information generation unit 133a outputs reflection information indicating that the second transmission signal to be removed or reduced does not exist.
Further, for example, when it is determined that the second transmission signal does not exist, the reflection information generation unit 133a indicates that there is no second transmission signal to be removed or reduced, and the position of the movable radio wave absorber 60. The reflection information may be output to the effect that the signal is changed to a direction away from the transmitting antenna 20 and is instructed to be arranged.

Next, the user changes the position of the movable radio wave absorber 60 in a direction away from the transmitting antenna 20 and arranges the movable radio wave absorber 60 at the second position, and radiates the transmission signal from the transmitting antenna 20. The reflection point estimation device 100a determines whether or not there is a second transmission signal to be removed or reduced at the second position.
When it is determined that the second transmission signal exists, for example, the reflection information generation unit 133a identifies the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal to be removed or reduced to be a closed curve at the first position. It exists in the region between the closed curve specified by the part 132a (hereinafter referred to as "first closed curve") and the closed curve specified by the closed curve specifying part 132a at the second position (hereinafter referred to as "second closed curve"). It may be estimated to generate reflection information including information indicating the region.

In the above description, an example is shown in which the reflection point estimation device 100a is performed by the signal identification unit 111 to determine whether or not there is a second transmission signal to be removed or reduced, but the determination is limited to this. is not it. For example, the determination may be made by the user confirming the magnitude of the amplitude of the second transmission signal.
Further, in the above description, an example is shown in which the reflection information generation unit 133a presumes that it exists in a region between the first closed curve and the second closed curve, and generates reflection information including information indicating the region. However, it is not limited to this. For example, the region may be specified by the user based on the information indicating the first closed curve and the information indicating the second closed curve included in the reflection information.

By using the reflection point estimation device 100a in this way, the user can place the radio wave absorber at the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal indicated by the reflection information output by the reflection point estimation device 100. By temporarily arranging and confirming the removal or reduction of the second transmission signal again, even if the second transmission signal is a reflected wave reflected not only once but also twice or more on the inner wall of the anechoic chamber 10, the second transmission signal is the second. 2 The position of the reflection point where the transmission signal is first reflected on the inner wall of the anechoic chamber 10 can be accurately specified. Therefore, the user can adjust the SVSWR value to 6 dB or less with a shorter time and less radio wave absorber than in the conventional trial and error arrangement study of the radio wave absorber.

Further, in the reflection point estimation device 100a, an inner size acquisition unit 101 for acquiring inner size information indicating the inner size of the anechoic chamber 10 for measuring electromagnetic radiation noise and an object to be measured inside the anechoic chamber 10 are arranged. The transmission position acquisition unit 102 that acquires transmission position information indicating the relative position of the transmission antenna 20 that emits the transmission signal in the anechoic chamber 10 and the inside of the anechoic chamber 10 arranged in a predetermined area. The reception position acquisition unit 103 that acquires the reception position information indicating the relative position in the anechoic chamber 10 of the reception antenna 30 that receives the transmission signal radiated by the transmission antenna 20 arranged at the predetermined position in the above. Among the transmission signals received by the receiving antenna 30, the first transmission signal, which is a transmission signal not reflected by the inner wall of the anechoic chamber 10, and the second transmission signal, which is the transmission signal reflected by the inner wall of the anechoic chamber 10, are selected. Radio wave absorber information indicating a relative region in the anechoic chamber 10 of the signal specifying unit 111 to be specified and the movable radio wave absorber 60 arranged at a position away from the inner wall of the anechoic chamber 10 inside the anechoic chamber 10. The radio wave absorber acquisition unit 150 to be acquired, the internal dimension information acquired by the internal size acquisition unit 101, the reception position information acquired by the reception position acquisition unit 103, and the radio wave absorber information acquired by the radio wave absorber acquisition unit 150. Based on this, a reflection point estimation unit 130a that estimates the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 and outputs reflection information indicating the estimated position of the reflection point is provided. rice field.

With this configuration, in the reflection point estimation device 100a, even if the electromagnetic radiation noise is a reflected wave reflected not only once but twice or more on the inner wall of the anechoic chamber 10, the electromagnetic radiation noise is reflected in the anechoic chamber 10 The position of the last reflection point can be estimated accurately on the inner wall of.

Further, in the above configuration, the reflection point estimation unit 130a has the relative position of the reception antenna 30 in the anechoic chamber 10 indicated by the reception position information acquired by the reception position acquisition unit 103 as the apex, and the radio wave absorber acquisition unit The conical surface of the conical surface including the outer periphery of the relative region in the anechoic chamber 10 of the movable radio wave absorber 60 indicated by the radio wave absorber information acquired by 150 is specified, and the reflection point estimation unit 130a identifies the conical surface. By specifying the closed curve where the surface and the inner wall of the anechoic chamber 10 intersect, the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal specifying unit 111 is estimated.

With this configuration, in the reflection point estimation device 100a, even if the electromagnetic radiation noise is a reflected wave reflected not only once but twice or more on the inner wall of the anechoic chamber 10, the electromagnetic radiation noise is reflected in the anechoic chamber 10 The position of the last reflection point can be estimated accurately on the inner wall of.

Further, in the above configuration, when the movable radio wave absorber 60 is arranged in a direction capable of absorbing the reflected wave of the transmission signal received by the receiving antenna 30, the reflection point estimation unit 130a acquires the reception position. The movable radio wave absorber 60 whose apex is the relative position of the receiving antenna 30 indicated by the reception position information acquired by the unit 103 in the anechoic chamber 10 and which is indicated by the radio wave absorber information acquired by the radio wave absorber acquisition unit 150. By specifying the cone surface of the cone whose cone surface includes the outer periphery of the relative region in the anechoic chamber 10, and the reflection point estimation unit 130a specifying the closed curve where the cone surface and the inner wall of the anechoic chamber 10 intersect. , The position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal specified by the signal identification unit 111 is estimated.

With this configuration, in the reflection point estimation device 100a, even if the electromagnetic radiation noise is a reflected wave reflected not only once but twice or more on the inner wall of the anechoic chamber 10, the electromagnetic radiation noise is reflected in the anechoic chamber 10 The position of the last reflection point can be estimated accurately on the inner wall of.

A method of using the reflection point estimation device 100a configured as described above will be described.
For example, the user arranges the movable radio wave absorber 60 at a position inside the anechoic chamber 10 away from the inner wall of the anechoic chamber 10 (hereinafter referred to as “third position”), and emits a transmission signal from the transmission antenna 20. .. The reflection point estimation device 100a determines whether or not there is a second transmission signal to be removed or reduced at the third position. For example, the signal identification unit 111 that specifies the second transmission signal determines whether or not there is a second transmission signal to be removed or reduced.
When it is determined that the second transmission signal does not exist, for example, the reflection information generation unit 133a outputs reflection information indicating that the second transmission signal to be removed or reduced does not exist.
Further, for example, when it is determined that the second transmission signal does not exist, the reflection information generation unit 133a indicates that there is no second transmission signal to be removed or reduced, and the position of the movable radio wave absorber 60. The reflection information may be output to the effect that the signal is changed to a direction away from the receiving antenna 30 and is instructed to be arranged.

Next, for example, the user changes the position of the movable radio wave absorber 60 in a direction away from the receiving antenna 30 and arranges the movable radio wave absorber 60 at the fourth position, and radiates the transmission signal from the transmitting antenna 20. The reflection point estimation device 100a determines whether or not there is a second transmission signal to be removed or reduced at the fourth position.
When it is determined that the second transmission signal exists, for example, the reflection information generation unit 133a identifies the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal to be removed or reduced to be a closed curve at the third position. It exists in the region between the closed curve specified by the part 132a (hereinafter referred to as the "third closed curve") and the closed curve specified by the closed curve specifying part 132a at the fourth position (hereinafter referred to as the "fourth closed curve"). It may be estimated to generate reflection information including information indicating the region.

In the above description, an example is shown in which the reflection point estimation device 100a is performed by the signal identification unit 111 to determine whether or not there is a second transmission signal to be removed or reduced, but the determination is limited to this. is not it. For example, the determination may be made by the user confirming the magnitude of the amplitude of the second transmission signal.
Further, in the above description, an example is shown in which the reflection information generation unit 133a presumes that it exists in a region between the third closed curve and the fourth closed curve, and generates reflection information including information indicating the region. However, it is not limited to this. For example, the region may be specified by the user based on the information indicating the third closed curve and the information indicating the fourth closed curve included in the reflection information.

By using the reflection point estimation device 100a in this way, the user can place the radio wave absorber at the position of the reflection point on the inner wall of the anechoic chamber 10 of the second transmission signal indicated by the reflection information output by the reflection point estimation device 100. By temporarily arranging and confirming the removal or reduction of the second transmission signal again, even if the second transmission signal is a reflected wave reflected not only once but also twice or more on the inner wall of the anechoic chamber 10, the second transmission signal is the second. 2 The position of the reflection point where the transmitted signal is reflected last on the inner wall of the anechoic chamber 10 can be accurately specified. Therefore, the user can adjust the SVSWR value to 6 dB or less with a shorter time and less radio wave absorber than in the conventional trial and error arrangement study of the radio wave absorber.

It should be noted that, within the scope of the invention, any combination of the embodiments can be freely combined, any component of each embodiment can be modified, or any component can be omitted in each embodiment. ..

The reflection point estimation device according to the present invention can be applied to estimate the reflection point on the inner wall of the anechoic chamber of electromagnetic radiation noise.

1,1a measurement system, 10 anechoic chamber, 11 floor radio wave absorber, 12 ceiling radio wave absorber, 13 wall radio wave absorber, 14, 15, 16, 17, 18 closed curve, 20 transmitting antenna, 21 transmitting cable, 30 receiving antenna, 31 receiving cable, 40 network analyzer, 50 storage device, 60 movable radio wave absorber, 100, 100a reflection point estimation device, 101 internal dimension acquisition unit, 102 transmission position acquisition unit, 103 reception position acquisition unit, 110 signal acquisition unit, 111 signal identification unit, 120 signal interval output unit, 121 propagation distance calculation unit, 130, 130a reflection point estimation unit, 131 rotating elliptical surface identification unit, 132, 132a closed curve identification unit, 133, 133a reflection information generation Unit, 134 cone surface identification unit, 140 estimation information output unit, 150 radio wave absorber acquisition unit, 151 radio wave absorber determination unit, 201 processor, 202 memory, 203 processing circuit, Dd propagation distance, Dr propagation distance, Δt time interval.

Claims (10)

An internal dimension acquisition unit that acquires internal dimension information indicating the internal dimensions of the anechoic chamber for measuring electromagnetic radiation noise, and an internal dimension acquisition unit.
Transmission that acquires transmission position information indicating the relative position in the anechoic chamber of the transmitting antenna that radiates the transmission signal, which is arranged in a predetermined area where the object to be measured is placed inside the anechoic chamber. Position acquisition section and
A receiving position for acquiring reception position information indicating a relative position in the anechoic chamber of a receiving antenna that receives the transmission signal radiated by the transmitting antenna, which is arranged at a predetermined position inside the anechoic chamber. Acquisition department and
Among the transmission signals received by the receiving antenna, the first transmission signal which is the transmission signal not reflected by the inner wall of the anechoic chamber and the second transmission which is the transmission signal reflected by the inner wall of the anechoic chamber. A signal identification unit that identifies a signal,
A signal interval output unit that specifies the time interval between the first transmission signal and the second transmission signal specified by the signal identification unit and outputs signal interval information indicating the specified time interval.
The internal dimension information acquired by the internal dimension acquisition unit, the transmission position information acquired by the transmission position acquisition unit, the reception position information acquired by the reception position acquisition unit, and the signal interval output unit output. Based on the signal interval information, the position of the reflection point of the second transmission signal specified by the signal identification unit on the inner wall of the anechoic chamber is estimated, and the reflection information indicating the estimated position of the reflection point is output. Reflection point estimation part and
A reflection point estimator characterized by being equipped with. Based on the transmission position information acquired by the transmission position acquisition unit, the reception position information acquired by the reception position acquisition unit, and the signal interval information output by the signal interval output unit, the signal identification unit It is provided with a propagation distance calculation unit that calculates the propagation distance of the specified second transmission signal from the transmission antenna to the reception antenna and outputs the propagation distance information indicating the calculated propagation distance.
The reflection point estimation unit includes the internal dimension information acquired by the internal dimension acquisition unit, the transmission position information acquired by the transmission position acquisition unit, the reception position information acquired by the reception position acquisition unit, and the reception position information. The claim is characterized in that the position of the reflection point on the inner wall of the anechoic chamber of the second transmission signal specified by the signal identification unit is estimated based on the propagation distance information output by the propagation distance calculation unit. 1. The reflection point estimation device according to 1. The reflection point estimation unit is the relative position of the transmission antenna indicated by the transmission position information acquired by the transmission position acquisition unit in the anechoic chamber and the reception position information acquired by the reception position acquisition unit. An ellipse whose focal point is the relative position of the receiving antenna in the anechoic chamber and whose major axis is the length of the propagation distance indicated by the propagation distance information output by the propagation distance calculation unit is the length of the ellipse. Identify the rotating ellipse that was rotated with the axis as the axis of rotation,
The reflection point estimation unit identifies the closed curve at which the spheroid surface and the inner wall of the anechoic chamber intersect, so that the reflection point of the second transmission signal specified by the signal identification unit on the inner wall of the anechoic chamber. The reflection point estimation device according to claim 2, wherein the position of the reflection point is estimated. An internal dimension acquisition unit that acquires internal dimension information indicating the internal dimensions of the anechoic chamber for measuring electromagnetic radiation noise, and an internal dimension acquisition unit.
Transmission that acquires transmission position information indicating the relative position in the anechoic chamber of the transmitting antenna that radiates the transmission signal, which is arranged in a predetermined area where the object to be measured is placed inside the anechoic chamber. Position acquisition section and
A receiving position for acquiring reception position information indicating a relative position in the anechoic chamber of a receiving antenna that receives the transmission signal radiated by the transmitting antenna, which is arranged at a predetermined position inside the anechoic chamber. Acquisition department and
Among the transmission signals received by the receiving antenna, the first transmission signal which is the transmission signal not reflected by the inner wall of the anechoic chamber and the second transmission which is the transmission signal reflected by the inner wall of the anechoic chamber. A signal identification unit that identifies a signal,
A radio wave absorber acquisition unit that acquires radio wave absorber information indicating a relative region in the anechoic chamber of a movable radio wave absorber arranged at a position away from the inner wall of the anechoic chamber inside the anechoic chamber.
The internal dimension information acquired by the internal dimension acquisition unit, the transmission position information acquired by the transmission position acquisition unit, the radio wave absorber information acquired by the radio wave absorber acquisition unit, or the internal dimension acquisition unit. Based on the internal dimension information acquired by the signal identification unit, the reception position information acquired by the reception position acquisition unit, and the radio wave absorber information acquired by the radio wave absorber acquisition unit, the signal identification unit identifies the first. (2) A reflection point estimation unit that estimates the position of the reflection point on the inner wall of the anechoic chamber of the transmission signal and outputs reflection information indicating the estimated position of the reflection point.
A reflection point estimator characterized by being equipped with. When the reflection point estimation unit estimates the position of the reflection point based on the internal dimension information, the transmission position information, and the radio wave absorber information.
The reflection point estimation unit has the relative position of the transmitting antenna indicated by the transmission position information acquired by the transmission position acquisition unit as an apex in the anechoic chamber, and the radio wave acquired by the radio wave absorber acquisition unit. The conical surface of the conical surface including the outer periphery of the relative region of the movable radio wave absorber in the anechoic chamber indicated by the absorber information is specified.
The reflection point estimation unit of the reflection point on the inner wall of the anechoic chamber of the second transmission signal specified by the signal identification unit by specifying a closed curve where the conical surface intersects the inner wall of the anechoic chamber. The reflection point estimation device according to claim 4, wherein the position is estimated. The fifth aspect of claim 5, wherein the movable radio wave absorber is arranged so that the movable radio wave absorber is arranged in a direction capable of absorbing a direct wave of the transmitted signal radiated from the transmitting antenna. Reflection point estimator. When the reflection point estimation unit estimates the position of the reflection point based on the internal dimension information, the reception position information, and the radio wave absorber information.
The reflection point estimation unit has the relative position of the receiving antenna indicated by the reception position information acquired by the reception position acquisition unit as the apex in the anechoic chamber, and the radio wave acquired by the radio wave absorber acquisition unit. The conical surface of the conical surface including the outer periphery of the relative region of the movable radio wave absorber in the anechoic chamber indicated by the absorber information is specified.
The reflection point estimation unit of the reflection point on the inner wall of the anechoic chamber of the second transmission signal specified by the signal identification unit by specifying a closed curve where the conical surface intersects the inner wall of the anechoic chamber. The reflection point estimation device according to claim 4, wherein the position is estimated. The reflection according to claim 7, wherein the movable radio wave absorber is arranged so that the movable radio wave absorber is arranged in a direction capable of absorbing the reflected wave of the transmission signal received by the receiving antenna. Point estimator. The internal dimension acquisition unit acquires the internal dimension information indicating the internal dimension of the anechoic chamber for measuring electromagnetic radiation noise, and the internal dimension acquisition step.
The transmission position acquisition unit indicates the relative position in the anechoic chamber of the transmission antenna that radiates the transmission signal, which is arranged in the predetermined area where the object to be measured is placed inside the anechoic chamber. The transmission position acquisition step to acquire the position information and
A receiving position in which the receiving position acquisition unit is arranged at a predetermined position inside the anechoic chamber and indicates a relative position in the anechoic chamber of the receiving antenna that receives the transmission signal radiated by the transmitting antenna. The reception position acquisition step to acquire information and
Among the transmission signals received by the reception antenna, the signal identification unit includes a first transmission signal that is the transmission signal that is not reflected by the inner wall of the anechoic chamber and the transmission signal that is reflected by the inner wall of the anechoic chamber. A signal identification step for identifying the second transmission signal, which is
The signal interval output unit specifies the time interval between the first transmission signal and the second transmission signal specified by the signal identification unit, and outputs signal interval information indicating the specified time interval. Steps and
The reflection point estimation unit has the internal dimension information acquired by the internal dimension acquisition unit, the transmission position information acquired by the transmission position acquisition unit, the reception position information acquired by the reception position acquisition unit, and the signal. Based on the signal interval information output by the interval output unit, the position of the reflection point of the second transmission signal specified by the signal identification unit on the inner wall of the anechoic chamber is estimated, and the estimated position of the reflection point is estimated. A reflection point estimation step that outputs the reflected reflection information to be shown, and
A reflection point estimation method characterized by being equipped with. The internal dimension acquisition unit acquires the internal dimension information indicating the internal dimension of the anechoic chamber for measuring electromagnetic radiation noise, and the internal dimension acquisition step.
The transmission position acquisition unit indicates the relative position in the anechoic chamber of the transmission antenna that radiates the transmission signal, which is arranged in the predetermined area where the object to be measured is placed inside the anechoic chamber. The transmission position acquisition step to acquire the position information and
A receiving position in which the receiving position acquisition unit is arranged at a predetermined position inside the anechoic chamber and indicates a relative position in the anechoic chamber of the receiving antenna that receives the transmission signal radiated by the transmitting antenna. The reception position acquisition step to acquire information and
Among the transmission signals received by the reception antenna, the signal identification unit includes a first transmission signal that is the transmission signal that is not reflected by the inner wall of the anechoic chamber and the transmission signal that is reflected by the inner wall of the anechoic chamber. A signal identification step for identifying the second transmission signal, which is
The radio wave absorber acquisition unit acquires radio wave absorber information indicating a relative region in the radio wave anechoic chamber of a movable radio wave absorber arranged at a position away from the inner wall of the radio wave anechoic chamber inside the radio wave absorber. Radio wave absorber acquisition step and
The reflection point estimation unit is the internal dimension information acquired by the internal dimension acquisition unit, the transmission position information acquired by the transmission position acquisition unit, and the radio wave absorber information acquired by the radio wave absorber acquisition unit, or the radio wave absorber information. , The signal identification based on the internal dimension information acquired by the internal dimension acquisition unit, the reception position information acquired by the reception position acquisition unit, and the radio wave absorber information acquired by the radio wave absorber acquisition unit. A reflection point estimation step that estimates the position of the reflection point on the inner wall of the anechoic chamber of the second transmission signal specified by the unit and outputs reflection information indicating the estimated position of the reflection point.
To have
A reflection point estimation method characterized by.

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