JP6928509B2 - Power measuring device - Google Patents

Description

The present invention relates to a power measuring device for measuring power leaked from a receiving facility for satellite broadcasting or the like.

Conventionally, in preparation for the start of practical broadcasting using 4K / 8K Super Hi-Vision satellites, in addition to the BS / CS right-handed (right-handed circularly polarized wave) band, BS / CS left-handed (left-handed circularly polarized wave) as a transmission path for broadcast waves. ) Bands have been added. After the BS / CS wave in the 12 GHz band is received by the parabolic antenna, the frequency band is converted to generate a BS / CS-IF signal. Then, the BS / CS-IF signal is input to the receiver via the equipment of each receiving facility.

The band of the BS / CS-IF signal for BS / CS right-handed rotation has been 1.0 GHz-2.1 GHz band. With the addition of BS / CS left-handed, the band of the BS / CS-IF signal of BS / CS left-handed has been standardized to use the 2.2 GHz-3.3 GHz band (see, for example, Non-Patent Document 1). ).

On the other hand, in the receiving equipment for satellite broadcasting that receives BS / CS waves, there is a radio wave (leaked radio wave) that leaks from the receiving equipment. There is a concern that other wireless systems using the same frequency band as the IF signal of the BS / CS wave will be affected by the interference of the leaked radio waves.

Therefore, in the newly added BS / CS left-handed BS / CS-IF signal band, there is a tendency that a permissible value is defined for the radiation power level of radio waves leaking from the receiving equipment (for example, Non-Patent Document 2). See). Therefore, it is necessary to measure the level in order to confirm whether or not the radio wave leaking from the installed receiving equipment is within the permissible value with the start of broadcasting by BS / CS left-handed rotation.

As a technique for measuring the level of received radio waves, for example, a method using conversion data preset according to the transmission method or the like has been proposed so as not to be affected by the difference in the transmission method or the transmission speed (for example). See Patent Document 1). In this method, the IF signal of the received radio wave is detected to obtain the detection voltage, the detection voltage is corrected with the predetermined calibration data to calculate the reference level, and the conversion data preset according to the transmission method or the like is used. It is used to correct the reference level and obtain the reception level.

Japanese Patent No. 3713359

ARIB STD-B63 "Information and Communication Council Information and Communication Technology Subcommittee Broadcasting System Committee Satellite Broadcasting Reception Equipment Working Group (8th)", [onloine], June 1, 2017, Ministry of Internal Affairs and Communications, [July 5, 2017 Day search], Internet <URL: http://www.soumu.go.jp/main_content/000488634.pdf>

As a means for measuring the electric power of radio waves leaking from the receiving equipment, it is desirable that the electric power measuring device can be easily handled by an electric appliance store or the like, which is a contractor of the receiving equipment. Currently, a simple power measuring device for broadcasting on the market mainly measures the terminal voltage of a received radio wave.

However, the radio waves leaked from the receiving equipment are weak, and the reception level of the leaked radio waves is low. Therefore, when the reception level of the leaked radio wave is close to the noise level, it becomes difficult to measure the terminal voltage. As described above, the conventional power measuring device has a problem that weak power cannot be measured with high accuracy.

Further, in order to calculate the radiated power of the leaked radio wave from the terminal voltage, the gain of the antenna used for receiving the leaked radio wave and the distance between the antenna and the receiving equipment are required. Furthermore, in order to measure weak leaked radio waves, it is necessary to bring the antenna closer to the receiving equipment to some extent, but the terminal voltage changes significantly as the distance increases, so in order to measure radiant power with high accuracy. , It is necessary to measure the distance with high accuracy.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a power measuring device capable of easily and accurately measuring weak power leaking from a receiving facility for satellite broadcasting or the like. There is.

In order to solve the above problem, the power measuring device according to claim 1 is a power measuring device that receives a leaked radio wave radiated from a device that inputs a signal of the received radio wave and measures the power of the leaked radio wave. A power measuring unit that inputs an output signal based on a predetermined signal from the device and uses a signal of a predetermined frequency in the output signal as a device side signal to measure the power of the device side signal, and a receiving antenna that receives the leaked radio wave. In addition to inputting the device side signal and the device side signal, a signal having a predetermined frequency in the leaked radio wave signal received by the receiving antenna unit is input as a leak signal, and the device side signal and the leaked signal are mixed. The power of the mixer that generates the mixing signal and the power of the mixing signal generated by the mixer are calculated, and based on the power of the mixing signal and a predetermined parameter, between the device side signal and the leakage signal. The power of the leaked radio wave is calculated based on the power ratio measuring unit for measuring the power ratio, the power of the device side signal measured by the power measuring unit, and the power ratio measured by the power ratio measuring unit. It is characterized in that it is equipped with a power calculation unit and a power calculation unit.

Further, the power measuring device according to claim 2 is the power measuring device according to claim 1, further inputting predetermined phase information and changing the phase of the leaked signal based on the phase information. The mixer comprises a phase shifter and a first filter that inputs the mixing signal generated by the mixer and performs LPF (low pass filter) filtering on the mixed signal. The leak signal whose phase has changed is input by the leak signal variable phase shifter, the device side signal and the leak signal whose phase have changed are mixed, and the mixed signal is generated in the first filter. Output, the power ratio measuring unit generates the phase information for changing the phase of the leaked signal, outputs the phase information to the leaked signal variable phase shifter, and for each of the phase information, the first The mixed signal after filtering is input from the filter of 1, the power of the mixed signal is calculated, the maximum value of the power of the mixed signal for each phase information is specified, and the maximum value of the power of the mixed signal is specified. And the power ratio is measured based on a predetermined parameter.

Further, the power measuring device according to claim 3 is the power measuring device according to claim 1, further inputting predetermined phase information, and changing the phase of the device side signal based on the phase information. The power measuring unit includes a signal variable phase shifter and a second filter that inputs the mixed signal generated by the mixer and performs LPF (low pass filter) filtering on the mixed signal. However, the device-side signal whose phase has been changed by the device-side signal variable phase shifter is input, the power of the device-side signal is measured, and the mixer uses the device-side signal variable phase shifter to measure the phase. Is input, the device side signal and the leak signal are mixed, the mixed signal is generated and output to the second filter, and the power ratio measuring unit performs the leak signal. The phase information for changing the phase of is generated, the phase information is output to the device side signal variable phase shifter, and the mixed signal after filtering is output from the second filter for each phase information. Input, calculate the power of the mixed signal, specify the maximum value of the power of the mixed signal for each phase information, and set the power ratio based on the maximum value of the power of the mixed signal and a predetermined parameter. It is characterized by measuring.

Further, the power measuring device according to claim 4 further inputs the mixed signal generated by the mixer in the power measuring device according to claim 1, and applies an HPF (high-pass filter) to the mixed signal. A third filter for filtering is provided, and the power ratio measuring unit inputs the filtered mixed signal from the third filter, calculates the power of the mixed signal, and obtains the power of the mixed signal and the power of the mixed signal. It is characterized in that the power ratio is measured based on a predetermined parameter.

The power measuring device according to claim 5 is the power measuring device according to claim 1, further comprising an oscillator that outputs an oscillator signal for shifting the frequency of the device side signal, the device side signal, and the oscillator. HPF for the device-side signal mixer that mixes the oscillator signal output by A fourth filter for filtering (high-pass filter) and a fifth filter for inputting the mixed signal generated by the mixer and performing LPF (low-pass filter) filtering on the mixed signal. , The power measuring unit inputs the filter-processed device-side signal from the fourth filter, measures the power of the device-side signal, and the mixer filters from the fourth filter. The device-side signal after processing is input, the device-side signal and the leakage signal are mixed, the mixed signal is generated and output to the fifth filter, and the power ratio measuring unit performs the fifth. The mixed signal after filtering is input from the filter of the above, the power of the mixed signal is calculated, and the power ratio is measured based on the power of the mixed signal and a predetermined parameter.

The power measuring device according to claim 6 is the power measuring device according to any one of claims 1 to 5, further measuring a distance between the receiving antenna unit and the device. And a radiated power calculation unit that calculates the radiated power of the leaked radio wave based on the power of the leaked radio wave calculated by the power calculating unit and the distance measured by the distance measuring unit. It is characterized by.

Further, the power measuring device according to claim 7 is the power measuring device according to claim 6, wherein the distance measuring unit irradiates a predetermined laser light toward the device, and the laser light reflected by the device is emitted. It is characterized in that the phase difference between the input and irradiated laser light and the input laser light is obtained, and the distance is measured based on the phase difference.

Further, the power measuring device according to claim 8 receives a leaked radio wave radiated from a device that inputs a signal of the received radio wave, and is a power measuring device that measures the power of the leaked radio wave. A first antenna that receives the same radio wave as the signal and a signal of the radio wave received by the first antenna are input, and a signal of a predetermined frequency in the signal of the radio wave is used as a radio wave signal, and the power of the radio wave signal is used. Is input as the power measuring unit that measures the power of the device side signal, which is the signal power of the device, the second antenna that receives the leaked radio wave, and the radio wave signal, and is received by the second antenna. A mixer that inputs a signal of a predetermined frequency in the leaked radio wave signal as a leak signal, mixes the radio wave signal and the leaked signal to generate a mixed signal, and the mixed signal generated by the mixer. A power ratio measuring unit that calculates the power and measures the power ratio between the radio wave signal and the leaked signal based on the power of the mixed signal and a predetermined parameter, and the device measured by the power measuring unit. Based on the power of the side signal and the power ratio measured by the power ratio measuring unit, the phase difference between the power calculation unit that calculates the power of the leaked radio wave and the radio wave signal and the leaked signal is obtained. , The distance measuring unit that measures the distance between the second antenna and the device based on the phase difference, the power of the leaked radio wave calculated by the power calculation unit, and the distance measuring unit. It is characterized by including a radiated power calculation unit that calculates the radiated power of the leaked radio wave based on the distance.

As described above, according to the present invention, the weak power leaked from the receiving equipment for satellite broadcasting can be measured easily and with high accuracy.

It is an image diagram showing the state of measuring the antenna reception power of the leaked radio wave using the power measuring apparatus of Example 1. FIG. It is a block diagram which shows the structural example of the electric power measuring apparatus of 1st Embodiment in Example 1. FIG. It is a block diagram which shows the structural example of the electric power measuring apparatus of 2nd Embodiment in Example 1. FIG. It is a block diagram which shows the structural example of the electric power measuring apparatus of 3rd Embodiment in Example 1. FIG. It is an image diagram showing the state of measuring the radiated power of the leaked radio wave using the power measuring apparatus of Example 2. FIG. It is a block diagram which shows the structural example of the electric power measuring apparatus of Example 2. It is a figure explaining the configuration example of the table provided in the data storage part. It is an image diagram showing the state of measuring the radiated power of the leaked radio wave using the power measuring apparatus of Example 3. FIG. It is a block diagram which shows the structural example of the electric power measuring apparatus of Example 3. FIG.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The present invention receives a leaked radio wave radiated from a device such as a receiving facility that inputs a signal of the received radio wave, and uses the leaked radio wave signal (leakage signal) and the output signal of the device (device side signal). It is characterized in that the power ratio between the signals of is calculated and the power of the leaked radio wave is measured based on the power ratio.

As a result, the power of the leaked radio wave is measured based on the power ratio between the leaked signal and the device side signal, so even if the reception level of the leaked radio wave is low and close to the noise level, the weak power can be measured. It can be measured easily and with high accuracy.

[Example 1]
First, Example 1 will be described. The first embodiment is an example of measuring the antenna reception power of the radio wave leaking from the receiving equipment by using the output signal of the receiving equipment that receives a predetermined radio wave. FIG. 1 is an image diagram showing how the antenna received power of the leaked radio wave is measured by using the power measuring device of the first embodiment.

The user connects the power measuring device 1 for measuring the antenna received power of the radio wave leaking from the receiving equipment 100 to the receiving equipment 100 via the coaxial cable 101.

The receiving equipment 100 is, for example, equipment for satellite broadcasting that receives BS / CS waves, and inputs BS / CS-IF signals of BS / CS waves received via an antenna (not shown). Then, the receiving equipment 100 performs processing such as amplification and distribution on the BS / CS-IF signal, and outputs the output signal generated based on the BS / CS-IF signal as the receiving equipment signal to the subsequent device. .. At this time, the receiving equipment signal is output to the power measuring device 1 via the coaxial cable 101.

Further, in the receiving equipment 100, radio waves are radiated (leaked) with the input of the BS / CS-IF signal. That is, the leaked radio wave is radiated from the receiving equipment 100.

The power measuring device 1 inputs a receiving equipment signal from the receiving equipment 100 via the coaxial cable 101, and receives the leaked radio wave radiated from the receiving equipment 100 via the antenna 3. Then, the power measuring device 1 measures the antenna received power of the leaked radio wave based on the receiving equipment signal and the leaked signal.

Hereinafter, the power measuring device 1 of the first embodiment shown in FIG. 1 will be described with reference to specific examples of the first form, the second form, and the third form. The first embodiment of the first embodiment is an example in which the receiving equipment signal and the leaked signal are mixed, the power ratio of the mixed signal is measured using an LPF (low-pass filter), and the antenna received power is measured. The second embodiment of the first embodiment is an example in which the reception equipment signal and the leakage signal are mixed, the power ratio of the mixed signal is measured using an HPF (high-pass filter), and the antenna reception power is measured. The third embodiment of the first embodiment is an example in which the frequency-shifted receiving equipment signal and the leaked signal are mixed, the power ratio of the mixed signal is measured using the LPF, and the antenna received power is measured.

[First form of Example 1]
The first embodiment of the power measuring device 1 of the first embodiment shown in FIG. 1 will be described. As described above, in the first embodiment of the first embodiment, the receiving equipment signal and the leaked signal are mixed, the power ratio of the mixed signal of the low frequency component is measured by using the LPF, and the power ratio of the receiving equipment signal is used. Measure the antenna received power.

FIG. 2 is a block diagram showing a configuration example of the power measuring device 1 of the first embodiment in the first embodiment. The power measuring device 1-1 includes BPF (bandpass filter) 10, 14, AMP (amplifier) 11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixer (mixer) 17, and the like. It includes an LPF 18, a power ratio measurement unit 19, and an antenna reception power calculation unit 20.

The BPF 10 inputs a reception equipment signal from the reception equipment 100 via the coaxial cable 101, performs a filter process for selecting a predetermined measurement frequency on the reception equipment signal, and obtains a signal in the frequency band after the filter processing. Output to AMP11. As a result, a signal having a measurement frequency is selected from the reception equipment signals.

The AMP 11 inputs a signal in the (selected) frequency band after filtering from the BPF 10, amplifies the signal in the frequency band after filtering, and uses the amplified signal as a facility side signal in the power measuring unit 12 and the mixer. Output to 17.

The power measuring unit 12 inputs the equipment side signal from the AMP 11 and measures the power of the equipment side signal. Then, the power measurement unit 12 outputs the power of the equipment side signal to the antenna reception power calculation unit 20.

The receiving antenna unit 13 receives the leaked radio wave radiated from the receiving equipment 100. The BPF 14 inputs a leaked radio signal from the receiving antenna unit 13, filters the leaked radio signal to select a predetermined measurement frequency, and AMP15 filters the leaked radio signal in the frequency band after the filter processing. Output to. As a result, a signal having a measurement frequency is selected from the leaked radio wave signal.

The AMP 15 inputs the leaked radio wave signal in the filtered (selected) frequency band from the BPF 14, amplifies the leaked radio wave signal in the filtered frequency band, and variably transfers the amplified leaked radio wave signal. Output to the phase unit 16.

The variable phase shifter 16 inputs the signal of the leaked radio wave after amplification from the AMP 15, and also inputs the phase information from the power ratio measuring unit 19. Then, the variable phase shifter 16 changes the phase of the signal of the leaked radio wave after amplification based on the phase information, and outputs the signal after the phase change to the mixer 17 as a leak signal.

The mixer 17 inputs the equipment side signal from the AMP 11, and also inputs the leakage signal from the variable phase shifter 16, mixes the equipment side signal and the leakage signal, and outputs the mixing signal to the LPF 18.

The LPF 18 inputs a mixed signal from the mixer 17, filters the mixed signal to remove a predetermined high frequency component, and performs a filtering process for removing a predetermined high frequency component to obtain a low frequency component (having a DC component having a large amplitude at a predetermined frequency). The mixed signal is output to the power ratio measuring unit 19.

The power ratio measuring unit 19 inputs a mixed signal of the low frequency component from the LPF 18 and measures the power of the mixed signal of the low frequency component. Then, the power ratio measuring unit 19 holds the measured power of the mixed signal of the low frequency component as the power corresponding to the already output phase information.

The power ratio measuring unit 19 changes the phase, outputs the phase information to the variable phase shifter 16, and inputs the mixed signal of the low frequency component corresponding to the phase information from the LPF 18. Then, the power ratio measuring unit 19 measures the power of the mixed signal of the low frequency component, and holds the measured power of the mixed signal of the low frequency component as the power corresponding to the already output phase information. The power ratio measuring unit 19 performs such processing for each of the different phases, and specifies the maximum value of the power in the mixed signal of the low frequency component.

The power ratio measuring unit 19 sets the equipment side signal before the amplification process by the AMP 11 and the leakage signal before the amplification process by the AMP 15 based on the maximum value of the power in the mixed signal of the low frequency components and the preset parameters. The power ratio R between them is measured. Then, the power ratio measuring unit 19 outputs the power ratio R to the antenna receiving power calculation unit 20. Details of the power ratio R and preset parameters will be described later.

The antenna reception power calculation unit 20 inputs the power ratio R (power ratio R between the equipment side signal before amplification and the leakage signal before amplification) from the power ratio measurement unit 19, and also inputs the power ratio R from the power measurement unit 12 to the equipment side. Enter the power of the signal. Then, the antenna reception power calculation unit 20 calculates the power of the leakage signal based on the power ratio R and the power of the equipment side signal, and outputs this as the antenna reception power of the leakage radio wave received by the reception antenna unit 13. ..

Here, the equipment side signal generated by the AMP 11, the leakage signal generated by the variable phase shifter 16, the mixed signal calculated by the mixer 17, the mixed signal of the low frequency components generated by the LPF 18, and the power ratio. The maximum value of the power of the mixed signal calculated by the measuring unit 19 and the power ratio R will be described.

In general, assuming that the symbol points on the Cartesian coordinates of the I-axis and the Q-axis in IQ modulation (quadrature modulation) are I (t) and Q (t), I (t) and Q (t) are expressed by the following equations. expressed.
[Number 1]
I (t) = A (t) cosφ (t)
Q (t) = A (t) sinφ (t) ・ ・ ・ (1)
A (t) is the amplitude and φ (t) is the phase.

Further, the modulated wave is obtained by multiplying I (t) and Q (t) by the carrier signal cos (ωt) and the signal −sin (ωt) which is phase-shifted by 90 degrees, respectively, and the signals resulting from the two multiplications. Is added and is expressed by the following formula. ω is the angular frequency.
[Number 2]
I (t) cos (ωt) −Q (t) sin (ωt)
= A (t) cosφ (t) cos (ωt) −A (t) sinφ (t) sin (ωt) ・ ・ ・ (2)

Here, from cos (α + β) = cos (α) cos (β) −sin (α) sin (β), the modulated wave is represented by the following equation.
[Number 3]
I (t) cos (ωt) −Q (t) sin (ωt)
= A (t) cos (ωt ＋ φ (t)) ・ ・ ・ (3)

Therefore, the equipment-side signal generated by the AMP 11 is represented by the following equation.
[Number 4]
(Equipment side signal) = A (t) G ₁ cos (ωt ＋ φ (t)) ・ ・ ・ (4)
G ₁ is the gain of AMP 11.

The leakage signal generated by the variable phase shifter 16 is represented by the following equation.
[Number 5]
(Leakage signal) = A (t ＋ Δt) G ₂ Rcos (ωt ＋ ωΔt ＋ φ (t ＋ Δt)) ・ ・ ・ (5)
G ₂ is the gain of AMP 15, and R is the power ratio between the equipment side signal before the amplification process by AMP 11 and the leakage signal before the amplification process by AMP 15, and is measured by the power ratio measuring unit 19 described above. Will be done.

Δt is the time difference between the reception equipment signal output from the reception equipment 100 and the leaked radio wave radiated from the reception equipment 100 until they are input to the power measuring device 1-1, respectively. This time difference corresponds to the difference (road length difference) between the road length of the reception equipment signal output from the reception equipment 100 and the road length of the leaked radio wave radiated from the reception equipment 100. When this time difference is sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal, it can be regarded as the following equation.
[Number 6]
A (t) ＝ A (t ＋ Δt) ＝ A
φ (t) ＝ φ (t ＋ Δt) ＝ φ ・ ・ ・ (6)

For example, in the ISDB-S3 standard that defines the satellite transmission system, the symbol rate is 33.7561 Mbaud, so the duration of one symbol is about 30 ns.

The equipment-side signal generated by the AMP 11 at this time is represented by the following equation.
[Number 7]
(Equipment side signal) = AG ₁ cos (ωt + φ) ・ ・ ・ (7)
G ₁ is the gain of AMP 11.

The leakage signal generated by the variable phase shifter 16 at this time is represented by the following equation.
[Number 8]
(Leakage signal) = AG ₂ Rcos (ωt ＋ ωΔt ＋ φ) ・ ・ ・ (8)

The mixed signal calculated by the mixer 17 is obtained by multiplying the equipment side signal and the leakage signal, and is represented by the following equation.
[Number 9]
(Mixed signal) = AG ₁ cos (ωt ＋ φ) × AG ₂ Rcos (ωt ＋ ωΔt ＋ φ)
= A ² G ₁ G ₂ R cos (ωt ＋ φ) cos (ωt ＋ ωΔt ＋ φ) ・ ・ ・ (9)

Here, from cos (α) cos (β) = (1/2) {cos (α + β) + cos (α−β)}, the mixed signal is expressed by the following equation.
[Number 10]
(Mixed signal) = AG ₁ cos (ωt ＋ φ) × AG ₂ Rcos (ωt ＋ ωΔt ＋ φ)
= (A ² G ₁ G ₂ R / 2) {cos (2ωt ＋ ωΔt ＋ 2φ) ＋ cos (−ωΔt)}
... (10)

The low-frequency component mixed signal generated by the LPF18 is a signal obtained by removing the high-frequency component from the mixed signal, and is represented by the following equation.
[Number 11]
(Mixed signal of low frequency components) = (A ² G ₁ G ₂ R / 2) cos (ωΔt) ・ ・ ・ (11)
Here, when Δt = 0, the maximum value of the power in the mixed signal of the low frequency component is (A ² G ₁ G ₂ R / 2).

The power ratio measuring unit 19 adjusts the phase of the leaked signal with the variable phase shifter 16 in order to obtain the maximum value of the power in the mixed signal of the low frequency component. As a result, the maximum value of power (A ² G ₁ G ₂ R / 2) in the mixed signal of low frequency components can be obtained.

Here, the gain G ₁ of the amplitude A, AMP11 symbol points on the orthogonal coordinate of the I-axis and Q axis in IQ modulation, and since the gain G ₂ of _{^{AMP15, (A 2 G 1 G}} 2/2) is Known or calculable. Therefore, the power ratio R is measured by obtaining ^{the maximum value (A 2} G ₁ G ₂ R / 2) of the power in the mixed signal of the low frequency components.

In other words, the power ratio measuring unit 19, based on the maximum value of the power in the mixed signal of the low frequency component ^{_{(A 2 G 1 G 2 R}} / 2) and pre-set parameters ^{_{(A 2 G 1 G 2/}} 2) , Measure the power ratio R.

As described above, according to the power measuring device 1-1 of the first embodiment in the first embodiment, the power measuring unit 12 refers to the receiving equipment signal input from the receiving equipment 100 via the coaxial cable 101 to the equipment side signal. Measure power. The mixer 17 mixes the equipment side signal with the signal of the leaked radio wave radiated from the receiving equipment 100 and received by the receiving antenna unit 13 to generate a mixed signal. The LPF18 extracts a mixed signal of low frequency components from the mixed signal.

The power ratio measuring unit 19 outputs the phase information to the variable phase shifter 16 to change the phase of the leaked signal, and the maximum value of the power in the mixed signal of the low frequency component (A ² G ₁ G ₂ R / 2) get. The power ratio measuring unit 19, based on the maximum value of the power in the mixed signal of the low frequency component _{^{(A 2 G 1 G 2 R}} / 2) and pre-set parameters _{^{(A 2 G 1 G 2/}} 2) , Measure the power ratio R.

The antenna reception power calculation unit 20 calculates the power of the leaked signal based on the power ratio R and the power of the equipment side signal, and outputs this as the antenna received power of the leaked radio wave.

As a result, the antenna received power of the leaked radio wave is measured based on the power ratio R between the equipment side signal and the leaked signal, so that even if the reception level of the leaked radio wave is low and close to the noise level, the power is measured. Weak power can be measured with high accuracy.

Further, the measurement of the antenna received power of the leaked radio wave by the power measuring device 1-1 is realized by the configuration as shown in FIG. As a result, a user such as a contractor of the receiving equipment 100 can easily handle the power measuring device 1-1 in the same manner as the conventional power measuring device for measuring the terminal voltage. Further, since the power measuring device 1-1 is a simple device, even an electric appliance store that actually constructs the receiving equipment 100 or a user without specialized knowledge can use the power measuring device 1-1. The leakage level can be measured.

Therefore, the weak power leaking from the receiving equipment 100 for satellite broadcasting can be measured easily and with high accuracy. Then, it is possible to confirm whether or not the radio wave leaking from the installed receiving equipment is within the permissible value or less with the start of broadcasting by BS / CS left-handed rotation.

The power measuring device 1-1 shown in FIG. 2 is provided with a variable phase shifter 16 between the AMP 15 and the mixer 17 so as to change the phase of the leakage signal. This is when the length of the coaxial cable 101 between the receiving equipment 100 and the power measuring device 1-1 is longer than the distance between the receiving equipment 100 and the antenna 3 provided in the power measuring device 1-1. It is valid. This is because the reception timing of the leaked radio wave of the latter is earlier than the input timing of the reception equipment signal of the former, and the delay of the leaked signal is small. Therefore, by delaying the phase of the leaked signal, the phase difference becomes small and the maximum power is specified. This is because it becomes easier to do. In actual operation, it is assumed that the length of the coaxial cable 101 is longer than the distance between the receiving equipment 100 and the antenna 3 provided in the power measuring device 1-1.

On the other hand, the power measuring device 1-1 is provided with a variable phase shifter 16 between the AMP 11 and the branch point of the power measuring unit 12 and the mixer 17, so that the phase of the equipment side signal is changed. You may. This is effective when the length of the coaxial cable 101 is shorter than the distance between the receiving equipment 100 and the antenna 3 provided in the power measuring device 1-1. This is because the reception timing of the leaked radio wave of the latter is later than the input timing of the reception equipment signal of the former, and the delay of the signal on the equipment side is small. Therefore, by delaying the phase of the signal on the equipment side, the phase difference becomes small and the maximum power This is because it becomes easier to identify.

In this case, the power ratio measuring unit 19 provides phase information to the variable phase shifter 16 provided between the AMP 11 and the branch point of the power measuring unit 12 and the mixer 17 in order to change the phase of the equipment side signal. Output. The same applies to the second embodiment of the first embodiment described later.

[Second embodiment of Example 1]
A second embodiment of the power measuring device 1 of the first embodiment shown in FIG. 1 will be described. As described above, in the second embodiment of the first embodiment, the receiving equipment signal and the leaked signal are mixed, the power ratio of the mixed signal of the high frequency component is measured by using HPF, and the antenna is obtained from the power and the power ratio of the receiving equipment signal. Measure the received power.

FIG. 3 is a block diagram showing a configuration example of the power measuring device 1 of the second embodiment in the first embodiment. The power measuring device 1-2 includes BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixer 17, antenna receiving power calculation unit 20, HPF21, and power ratio measuring unit. 22 is provided.

The power measuring device 1-1 of the first form shown in FIG. 2 and the power measuring device 1-2 of the second form shown in FIG. 3 are compared. Both power measuring devices 1-1 and 1-2 include BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixer 17, and antenna receiving power calculation unit 20. It is common in that it is. On the other hand, the power measuring device 1-2 is different in that the HPF 21 and the power ratio measuring unit 22 are provided instead of the LPF 18 and the power ratio measuring unit 19 of the power measuring device 1-1. In FIG. 3, the parts common to FIG. 2 are designated by the same reference numerals as those in FIG. 2, and detailed description thereof will be omitted.

The HPF 21 inputs a mixed signal from the mixer 17, filters the mixed signal to remove a predetermined low frequency component, and measures the mixed signal of the high frequency component (having a constant bandwidth) by power ratio measurement. Output to unit 22.

The power ratio measuring unit 22 inputs the mixed signal of the high frequency component from the HPF 21 and measures the power of the mixed signal of the high frequency component. Then, the power ratio measuring unit 22 determines the equipment side signal before the amplification process by the AMP 11 and the leakage signal before the amplification process by the AMP 15 based on the power of the measured mixed signal of the high frequency components and the preset parameters. The power ratio R between them is measured. Then, the power ratio measuring unit 22 outputs the power ratio R to the antenna receiving power calculation unit 20. Details of the power ratio R and preset parameters will be described later.

When the time difference Δt described above is not sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal, the power ratio measuring unit 22 changes the phase and outputs the phase information to the variable phase shifter 16. do. The time difference Δt is the time difference between the reception equipment signal output from the reception equipment 100 and the leaked radio wave radiated from the reception equipment 100 before being input to the power measuring device 1-2, respectively.

In this case, the power ratio measuring unit 22 inputs the mixed signal of the high frequency component corresponding to the phase information from the HPF 21, measures the power, and outputs the power of the measured mixed signal of the high frequency component to the already output phase. Hold as power corresponding to information. The power ratio measuring unit 22 performs such processing for each of different phases to specify the maximum value of the power in the mixed signal of the high frequency components. When the phase difference between the equipment side signal and the leakage signal is the minimum, the power is maximized.

The power ratio measuring unit 22 measures the power ratio R based on the maximum value of the power in the mixed signal of the high frequency components and the preset parameters.

Here, the mixing signal calculated by the mixer 17 is as shown in the above equation (10). The mixed signal of the high frequency component generated by the HPF 21 is a signal obtained by removing the low frequency component from the mixed signal, and is represented by the following equation.
[Number 12]
(Mixed signal of high frequency components) = (A ² G ₁ G ₂ R / 2) cos (2ωt ＋ ωΔt ＋ 2φ) ・ ・ ・ (12)

Since ωΔt is a fixed phase difference that does not depend on the time, it does not affect the signal waveform. φ depends on the time and is switched every 1 symbol duration (1 / symbol rate) of the signal. From the expression that is the mixed signal of the high frequency component (12), and the power ratio _{^{R = 1 (A 2 G 1}} G 2/2) cos (2ωt + ωΔt + 2φ) is a signal having a frequency band width due to 2 [phi, the power Is known or can be calculated. Therefore, the power ratio R is measured by obtaining (A ² G ₁ G ₂ R / 2) cos (2ωt + ωΔt + 2φ).

In other words, the power ratio measuring unit 22, the equation power and preset parameters of the mixed signal of the high frequency components shown in _{^{(12) (A 2 G 1}} G 2/2) based on cos (2ωt + ωΔt + 2φ) , power ratio R To measure.

As described above, according to the power measuring device 1-2 of the second embodiment in the first embodiment, the HPF 21 extracts the mixed signal of the high frequency component from the mixed signal generated by the mixer 17. Ratio measuring unit 22, the mixed signal of the high frequency component power ^{_{(A 2 G 1 G 2 R}} / 2) cos (2ωt + ωΔt + 2φ) and pre-set parameters ^{_{(A 2 G 1 G 2/}} 2) cos (2ωt + ωΔt + 2φ) Based on this, the power ratio R is measured. The antenna reception power calculation unit 20 calculates the power of the leaked signal based on the power ratio R and the power of the equipment side signal, and outputs this as the antenna received power of the leaked radio wave.

As a result, the antenna received power of the leaked radio wave is measured based on the power ratio R between the equipment side signal and the leaked signal as in the first mode, so that the received level of the leaked radio wave is low and close to the noise level. Even in this case, the weak power can be measured with high accuracy. Further, a user such as a contractor of the receiving equipment 100 can easily handle the power measuring device 1-2 in the same manner as the conventional power measuring device for measuring the terminal voltage.

Therefore, as in the first embodiment, the weak power leaking from the receiving equipment 100 for satellite broadcasting can be measured easily and with high accuracy.

[Third form of Example 1]
A third embodiment of the power measuring device 1 of the first embodiment shown in FIG. 1 will be described. As described above, in the third embodiment of the first embodiment, the frequency-shifted receiving equipment signal and the leaked signal are mixed, and the power ratio of the mixed signal of the low frequency component is measured by using the LPF, and the receiving equipment signal is measured. The antenna received power is measured from the power and power ratio of.

FIG. 4 is a block diagram showing a configuration example of the power measuring device 1 of the third embodiment in the first embodiment. The power measuring devices 1-3 include BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixers 17, 24, LPF18, antenna receiving power calculation unit 20, and oscillator 23. , HPF25 and power ratio measuring unit 26.

The power measuring device 1-1 of the first form shown in FIG. 2 and the power measuring device 1-3 of the third form shown in FIG. 4 are compared. Both power measuring devices 1-1, 1-3 include BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixer 17, LPF18, and antenna receiving power calculation unit 20. It is common in that it has. On the other hand, the power measuring device 1-3 includes a power ratio measuring unit 26 instead of the power ratio measuring unit 19 of the power measuring device 1-1, and further includes an oscillator 23, a mixer 24, and an HPF 25. It's different. In FIG. 4, the parts common to FIG. 2 are designated by the same reference numerals as those in FIG. 2, and detailed description thereof will be omitted.

The oscillator 23 outputs a predetermined oscillator signal for shifting the frequency of the equipment side signal to the mixer 24. The mixer 24 inputs the equipment side signal from the AMP 11 and the oscillator signal from the oscillator 23, mixes the equipment side signal and the oscillator signal, and outputs the mixed equipment side signal (equipment side signal whose frequency is shifted). Output to HPF25. The frequency of the predetermined oscillator signal is the frequency of the component having a large amplitude in the mixed signal of the low frequency component output from the LPF18.

The HPF 25 inputs the equipment-side signal after mixing from the mixer 24, performs a filter process on the equipment-side signal after mixing to remove a predetermined low-frequency component, and measures the power of the equipment-side signal of the high-frequency component. Output to unit 12 and mixer 17.

The mixer 17 inputs the equipment side signal of the high frequency component from the HPF 25, inputs the leakage signal from the variable phase shifter 16, mixes the equipment side signal and the leakage signal of the high frequency component in the same manner as described above, and mixes the signals. Is output to the LPF18.

The LPF 18 inputs a mixed signal from the mixer 17, performs a filter process on the mixed signal to remove a predetermined high frequency component, and sends the mixed signal of the low frequency component to the power ratio measuring unit 26 in the same manner as described above. Output.

The power ratio measuring unit 26 inputs the mixed signal of the low frequency component from the LPF 18 and measures the power of the mixed signal of the low frequency component. Then, the power ratio measuring unit 26 determines the equipment side signal before the amplification process by the AMP 11 and the leakage signal before the amplification process by the AMP 15 based on the measured power of the mixed signal of the low frequency components and the preset parameters. The power ratio R between is measured. Then, the power ratio measuring unit 26 outputs the power ratio R to the antenna receiving power calculation unit 20. Details of the power ratio R and preset parameters will be described later.

When the time difference Δt described above is not sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal, the power ratio measuring unit 26 changes the phase and outputs the phase information to the variable phase shifter 16. do. The time difference Δt is the time difference between the reception equipment signal output from the reception equipment 100 and the leaked radio wave radiated from the reception equipment 100 before being input to the power measuring device 1-3, respectively.

In this case, the power ratio measuring unit 26 inputs the mixed signal of the low frequency component corresponding to the phase information from the LPF 18, measures the power, and has already output the power of the measured mixed signal of the low frequency component. It is held as the power corresponding to the phase information of. The power ratio measuring unit 26 performs such processing for each of the different phases, and specifies the maximum value of the power in the mixed signal of the low frequency component. When the phase difference between the equipment side signal after mixing and the leakage signal is the minimum, the power is maximized.

The power ratio measuring unit 26 measures the power ratio R based on the maximum value of the power in the mixed signal of the low frequency component and the preset parameters.

Here, the equipment-side signal generated by the AMP 11 is as shown in the above formula (7), and the leak signal generated by the variable phase shifter 16 is as shown in the above formula (8). The oscillator signal output from the oscillator 23 is as follows.
[Number 13]
(Oscillator signal) = AR'cos (ω't) ・ ・ ・ (13)
R'is the power ratio between the equipment side signal and the oscillator signal, and ω'is the angular frequency of the oscillator signal.

The equipment-side signal after mixing calculated by the mixer 24 is obtained by multiplying the equipment-side signal and the oscillator signal, and is represented by the following equation.
[Number 14]
(Equipment side signal after mixing)
= AG ₁ cos (ωt ＋ φ) × AR'cos (ω't)
= (A ² G ₁ R'/2) {cos (ωt ＋ φ ＋ ω't) ＋ cos (ωt ＋ φ−ω't)}
... (14)

The equipment-side signal of the high-frequency component generated by the HPF25 is a signal obtained by removing the low-frequency component from the equipment-side signal after mixing, and is represented by the following equation.
[Number 15]
(Equipment side signal of high frequency component) = (A ² G ₁ R'/2) cos (ωt ＋ φ ＋ ω't)
... (15)

The mixed signal calculated by the mixer 17 is obtained by multiplying the equipment side signal and the leakage signal of the high frequency component, and is represented by the following equation.
[Equation 16]
(Mixed signal)
= (A ² G ₁ R'/2) cos (ωt ＋ φ ＋ ω't) × AG ₂ Rcos (ωt ＋ ωΔt ＋ φ)
= (A ³ G ₁ G ₂ RR'/4) {cos (2ωt ＋ ω't ＋ ωΔt ＋ 2φ) ＋ cos (ω't−ωΔt)}
... (16)

The low-frequency component mixed signal generated by the LPF18 is a signal obtained by removing the high-frequency component from the mixed signal, and is represented by the following equation.
[Number 17]
(Mixed signal of low frequency components) = (A ³ G ₁ G ₂ RR'/4) cos (ω't−ωΔt) ・ ・ ・ (17)

Since ωΔt is a fixed phase difference that does not depend on the time, it does not affect the amplitude value. ^{The (A 3} G ₁ G ₂ R'/4) cos (ω't−ωΔt) in which the power ratio R = 1 in the above equation (17) showing the mixed signal of the low frequency components is known or can be calculated. Therefore, the power ratio R is measured by obtaining (A ³ G ₁ G ₂ RR'/4) cos (ω't−ωΔt).

That is, the power ratio measuring unit 26 uses the power of the mixed signal of the low frequency component represented by the equation (17) and the preset parameters (A ³ G ₁ G ₂ R'/4) cos (ω't−ωΔt). The power ratio R is measured based on.

As described above, according to the power measuring device 1-3 of the third embodiment in the first embodiment, the mixer 24 mixes the equipment side signal and the oscillator signal output from the oscillator 23, and the HPF 25 is after mixing. The equipment side signal of the high frequency component is extracted from the equipment side signal of. The mixer 17 mixes the equipment side signal and the leakage signal of the high frequency component to generate a mixed signal, and the LPF 18 extracts the mixed signal of the low frequency component from the mixed signal.

The power ratio measuring unit 26 uses the power (A ³ G ₁ G ₂ RR'/4) cos (ω't−ωΔt) ^{of the mixed signal of the low frequency component and the preset parameters (A 3} G ₁ G ₂ R'. / 4) Measure the power ratio R based on cos (ω't−ωΔt). The antenna reception power calculation unit 20 calculates the power of the leaked signal based on the power ratio R and the power of the equipment side signal, and outputs this as the antenna received power of the leaked radio wave.

As a result, the antenna received power of the leaked radio wave is measured based on the power ratio R between the equipment side signal and the leaked signal as in the first and second forms, so that the reception level of the leaked radio wave is low. Even when the noise level is close to the noise level, the weak power can be measured with high accuracy. Further, a user such as a contractor of the receiving equipment 100 can easily handle the power measuring device 1-3 in the same manner as the conventional power measuring device for measuring the terminal voltage.

Therefore, as in the first and second forms, the weak power leaking from the receiving equipment 100 for satellite broadcasting can be measured easily and with high accuracy.

[Example 2]
Next, Example 2 will be described. In the second embodiment, the output signal of the receiving equipment 100 is used to measure the antenna reception power of the radio wave leaking from the receiving equipment 100 (Example 1), and further, the distance to the receiving equipment 100 is determined by laser light. This is an example of measuring the radiated power of leaked radio waves by measuring using. FIG. 5 is an image diagram showing how the radiant power of the leaked radio wave is measured by using the power measuring device of the second embodiment.

The user connects the power measuring device 2 for measuring the radiated power of the radio wave leaking from the receiving equipment 100 to the receiving equipment 100 via the coaxial cable 101.

As described with reference to FIG. 1, the receiving equipment 100 is, for example, equipment for satellite broadcasting that receives BS / CS waves, and performs predetermined processing on the BS / CS-IF signals of the received BS / CS waves. After that, the reception equipment signal is output to the subsequent device. At this time, the receiving equipment signal is output to the power measuring device 2 via the coaxial cable 101. Further, the receiving equipment 100 radiates the leaked radio wave accompanying the input of the BS / CS-IF signal.

The power measuring device 2 is a device in which the power measuring device 1 of the first embodiment shown in FIG. 1 and the device having a distance measuring function are integrated. The antenna 3 and the distance measuring unit 32, which will be described later, which realizes the distance measuring function, are integrated with the power measuring device 2 and are fixedly installed at predetermined positions.

Similar to the power measuring device 1, the power measuring device 2 receives the leaked radio wave radiated from the receiving equipment 100 via the antenna 3, and inputs the receiving equipment signal from the receiving equipment 100 via the coaxial cable 101. .. Then, the power measuring device 2 measures the antenna received power of the leaked radio wave based on the leaked radio wave signal and the receiving equipment signal, similarly to the power measuring device 1.

The power measuring device 2 outputs the laser light to the receiving equipment 100 and inputs the laser light reflected by the receiving equipment 100 to input the distance (measurement distance) between the antenna 3 of the power measuring device 2 and the receiving equipment 100. ) Is measured. Then, the power measuring device 2 calculates the terminal voltage based on the antenna received power of the leaked radio wave, calculates the electric field strength based on the terminal voltage, the antenna gain, and the like, and based on the electric field strength and the measurement distance, the leaked radio wave. Calculate the radiated power. The power measuring device 2 displays the terminal voltage, the electric field strength, the radiated power, and the measured distance on the display 4.

[Embodiment of Example 2]
The power measuring device 2 of the second embodiment shown in FIG. 5 will be described with reference to specific embodiments. In the second embodiment, the reception equipment signal and the leaked radio wave signal are mixed, the power ratio of the mixed signal is measured, the antenna reception power is measured, and the distance between the antenna 3 and the reception equipment 100 is determined. Calculated using laser light and measure the radiated power of leaked radio waves.

FIG. 6 is a block diagram showing a configuration example of the power measuring device 2 of the second embodiment. The power measuring device 2 includes BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, and variable phase shifter 16 of the power measuring device 1-1 of the first embodiment shown in FIG. , Mixer 17, LPF18, power ratio measurement unit 19, antenna reception power calculation unit 20 (constituent part of α), data storage unit 31, distance measurement unit 32, terminal voltage calculation unit 33, electric field strength calculation unit. 34, a radiated power calculation unit 35 and a display unit 36 are provided.

The power measuring device 1-1 of the first embodiment shown in FIG. 2 and the power measuring device 2 of the second embodiment shown in FIG. 6 are compared. Both power measuring devices 1-1 and 2 include BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixer 17, LPF18, power ratio measuring unit 19, and antenna receiving power. It is common in that it includes a calculation unit 20. On the other hand, in addition to the configuration of the power measuring device 1-1, the power measuring device 2 further includes a data storage unit 31, a distance measuring unit 32, a terminal voltage calculation unit 33, an electric field strength calculation unit 34, a radiated power calculation unit 35, and a display. It differs in that it includes a portion 36. In FIG. 6, the parts common to FIG. 2 are designated by the same reference numerals as those in FIG. 2, and detailed description thereof will be omitted.

The BPF 14 inputs a signal of the leaked radio wave from the receiving antenna unit 13, and also inputs a preset selection signal. Then, the BPF 14 filters the leaked radio wave signal according to the measurement frequency indicated by the selection signal, and outputs the leaked radio wave signal in the frequency band after the filter processing to the AMP 15.

The data storage unit 31 reads various data (wavelength, antenna gain, loss, gain G _{2 of} AMP 15) corresponding to the measurement frequency indicated by the preset selection signal from the table (not shown), and reads various data. Output to the electric field strength calculation unit 34.

FIG. 7 is a diagram illustrating a configuration example of a table provided in the data storage unit 31. This table is composed of various data of _{wavelength, antenna gain, loss, and gain G 2} of AMP 15 for each measurement frequency a, b, c, etc. These various data are stored in the table in advance.

The wavelength is the wavelength in the signal of the leaked radio wave after the filtering generated by the BPF 14, the antenna gain is the gain of the antenna 3 provided in the power measuring device 2, and the loss is the cable loss and insertion by the coaxial cable 101. It is a loss.

Returning to FIG. 6, the distance measuring unit 32 measures the distance between the antenna 3 of the power measuring device 2 and the receiving equipment 100 using laser light, and measures the measured distance d by the radiant power calculating unit 35 and the display unit. Output to 36.

The distance measuring unit 32 includes a light emitting unit 40, a light receiving unit 41, and a distance calculating unit 42. The light emitting unit 40 irradiates a predetermined laser beam toward the receiving equipment 100. The laser light emitted from the light emitting unit 40 is reflected by the receiving equipment 100 toward the power measuring device 2.

The light receiving unit 41 inputs the laser light reflected by the receiving equipment 100, obtains the phase difference between the laser light output by the light emitting unit 40 and the laser light input by the light receiving unit 41, and obtains the phase difference. Output to the distance calculation unit 42. The distance calculation unit 42 inputs the phase difference from the light receiving unit 41, and calculates the distance between the antenna 3 of the power measuring device 2 and the receiving equipment 100 from the phase difference. The distance calculation unit 42 outputs the measurement distance d to the radiant power calculation unit 35 and the display unit 36.

Since the method of measuring the distance using laser light is known, the description thereof will be omitted. For details, refer to, for example, Japanese Patent No. 3307730.

The terminal voltage calculation unit 33 inputs the antenna reception power Pr [dBm] from the antenna reception power calculation unit 20, calculates the terminal voltage Et [dBμV] by the following formula, and uses the terminal voltage Et as the electric field strength calculation unit 34 and the electric field strength calculation unit 34. Output to the display unit 36.
[Equation 18]
Et = Pr + 108.8 ・ ・ ・ (18)

The electric field strength calculation unit 34 inputs various data (wavelength, antenna gain, loss, gain G _{2 of} AMP 15) according to the measurement frequency from the data storage unit 31, and inputs the terminal voltage Et from the terminal voltage calculation unit 33. ..

The electric field strength calculation unit 34 calculates the electric field strength E [dBμV / m] by the following formula based on the terminal voltage Et, the wavelength, the antenna gain, the loss, and the gain G _{2 of the AMP 15.} Then, the electric field strength calculation unit 34 outputs the electric field strength E to the radiant power calculation unit 35 and the display unit 36.
[Number 19]
E = Et− (20log (λ / π) + G _ANT + G ₂ −L-6) ・ ・ ・ (19)
λ [m] is the wavelength, G _ANT [dBi] is the antenna gain, and L [dB] is the loss.

The radiant power calculation unit 35 inputs the electric field strength E from the electric field strength calculation unit 34, inputs the measurement distance d [km] from the distance measurement unit 32, and calculates the radiant power Pt [dBm] by the following formula. .. Then, the radiant power calculation unit 35 outputs the radiant power Pt to the display unit 36.
[Number 20]
Pt = E + 20log (d) + 74.8 ・ ・ ・ (20)

The display unit 36 inputs the measurement distance d from the distance measurement unit 32, the terminal voltage Et from the terminal voltage calculation unit 33, the electric field strength E from the electric field strength calculation unit 34, and the radiated power Pt from the radiated power calculation unit 35. .. Then, the display unit 36 displays the measurement distance d, the terminal voltage Et, the electric field strength E, and the radiated power Pt.

As described above, according to the power measuring device 2 of the second embodiment, the data storage unit 31 has various data (wavelength, antenna gain, loss, gain G of AMP15) corresponding to the measurement frequency indicated by the preset selection signal. ₂ ) is read from the table. The distance measuring unit 32 measures the distance between the antenna 3 of the power measuring device 2 and the receiving equipment 100 by using the laser beam.

The terminal voltage calculation unit 33 calculates the terminal voltage Et based on the antenna reception power Pr calculated by the antenna reception power calculation unit 20. The electric field strength calculation unit 34 calculates the electric field strength E based on the terminal voltage Et and various data (wavelength, antenna gain, loss, gain G _{2 of AMP 15) corresponding to the measurement frequency.} The radiant power calculation unit 35 calculates the radiant power Pt based on the electric field strength E and the measurement distance d.

As a result, the radiated power Pt of the leaked radio wave is the antenna received power Pr measured from the power ratio R between the equipment side signal and the leaked signal in the first embodiment, and various data (wavelength, antenna gain, etc.) corresponding to the measured frequency. Since the measurement is based on the loss, the gain G ₂ ) of the AMP 15, and the measurement distance d, even when the reception level of the leaked radio wave is low and close to the noise level, the weak power can be measured with high accuracy. Further, a user such as a contractor of the receiving equipment 100 can easily handle the power measuring device 2 in the same manner as the conventional power measuring device for measuring the terminal voltage.

Therefore, similarly to the first embodiment, the weak power leaking from the receiving equipment 100 for satellite broadcasting can be measured easily and with high accuracy.

Generally, in order to measure weak leaked radio waves, it is necessary to bring the antenna 3 closer to the receiving equipment 100 to some extent, but if the distance is shortened, the changes in the antenna receiving power Pr, the terminal voltage Et, and the electric field strength E become large. It ends up. Therefore, in order to measure the radiant power Pt with high accuracy, it is necessary to measure the distance with high accuracy. Since the measurement distance d is measured by the power measuring device 2 using the laser beam, the accuracy can be improved, and as a result, the radiated power Pt can be measured with high accuracy.

Further, since the power measuring device 2 is configured by integrating the power measuring device 1 of the first embodiment shown in FIG. 1 and the device having a function of measuring the measurement distance d, the antenna received power Pr and the terminal The voltage Et and the electric field strength E can be measured and the measurement distance d can be measured at the same time. Since the measured antenna reception power Pr, terminal voltage Et, and electric field strength E correspond to the measurement distance d measured at that time, the radiated power Pt can be measured with higher accuracy.

Further, in the power measuring device 2, the antenna 3 is fixedly installed integrally with the power measuring device 2, and the distance measuring unit 32 is also fixedly installed integrally with the power measuring device 2. Therefore, the positional relationship between the position of the antenna 3 and the distance measuring unit 32 can be kept constant according to the form of the housing of the integrated power measuring device 2, and is known. Therefore, the accuracy of the measurement distance d can be further improved, and as a result, the radiant power Pt can be measured with higher accuracy.

The power measuring device 2 of the second embodiment shown in FIG. 6 is provided with the configuration of the power measuring device 1-1 of the first embodiment shown in the first embodiment shown in FIG. 2 (α in FIG. 6). Instead of this, the power measuring device 2 may include the power measuring device 1-2 of the second embodiment shown in FIG. Further, the power measuring device 2 may include the power measuring device 1-3 of the third embodiment shown in the first embodiment shown in FIG.

[Example 3]
Next, Example 3 will be described. The third embodiment is an example of measuring the radiated power of the leaked radio wave by using the output signal of its own antenna instead of the output signal of the receiving equipment 100 when the output signal of the receiving equipment 100 cannot be acquired. Realize outdoor measurement away from equipment 100. FIG. 8 is an image diagram showing how the radiant power of the leaked radio wave is measured by using the power measuring device of the third embodiment.

The receiving equipment 100 is equipment for satellite broadcasting that receives satellite broadcasting of BS / CS waves from BS / 110 degree CS60. In the third embodiment, the output signal of the receiving equipment 100 is not used. Leaked radio waves accompanying the input of the BS / CS-IF signal are radiated from the receiving equipment 100.

The measuring vehicle 61 is equipped with a power measuring device 5 including antennas 3 and 6 and a distance measuring device 62. The user measures the radiated power of the leaked radio wave from the receiving equipment 100 in the field by using the power measuring device 5 mounted on the measuring vehicle 61.

The power measuring device 5 includes antennas 3 and 6 and a distance measuring device 62 having a distance measuring function. The antenna 3 is an antenna for receiving leaked radio waves radiated from the receiving equipment 100, and the antenna 6 is an antenna for receiving satellite broadcasts that directly receives satellite broadcasts from BS / 110 degree CS60. The distance measuring device 62 corresponds to a distance measuring unit 32 (see FIG. 6) that measures a distance using a laser beam in the power measuring device 2 of the second embodiment shown in FIG.

The power measuring device 5 receives the leaked radio wave radiated from the receiving equipment 100 via the antenna 3 and inputs the satellite broadcast signal received by the antenna 6. Then, the power measuring device 5 measures the antenna received power of the leaked radio wave based on the leaked radio wave signal and the satellite broadcasting signal, similarly to the power measuring device 1.

The power measuring device 5 outputs the laser light to the receiving equipment 100 by the distance measuring device 62, and inputs the laser light reflected by the receiving equipment 100 to connect the antenna 3 of the power measuring device 5 and the receiving equipment 100. Measure the distance between (measurement distance). Then, the power measuring device 5 calculates the terminal voltage based on the antenna received power of the leaked radio wave, calculates the electric field strength based on the terminal voltage, the antenna gain, and the like, and based on the electric field strength and the measurement distance, the leaked radio wave. Calculate the radiated power. The power measuring device 2 displays the terminal voltage, the electric field strength, the radiated power, and the measurement distance.

[Embodiment of Example 3]
The power measuring device 5'excluding the distance measuring device 62 from the power measuring device 5 of the third embodiment shown in FIG. 8 will be described with reference to a specific embodiment. In the embodiment of the third embodiment, the satellite broadcast signal received by itself and the leaked radio wave signal are mixed, the power ratio of the mixed signal is measured, the antenna received power is measured, and further, the antenna 3 and the receiving equipment 100 are combined. The distance between them is calculated using the phase difference between the satellite broadcast signal and the leaked radio wave signal, and the radiated power of the leaked radio wave is measured.

The power measuring device 5'is in place of the distance measuring device 62 shown in FIG. 8, that is, in place of the distance measuring unit 32 (see FIG. 6) in the power measuring device 2 of the second embodiment shown in FIG. It is equipped with a distance measuring unit that measures the distance using the phase difference between the received satellite broadcast signal and the leaked radio wave signal.

FIG. 9 is a block diagram showing a configuration example of the power measuring device 5'of the third embodiment. This power measuring device 5'corresponds to BPF10, 14, AMP11, 15, power measuring unit 12, and antenna 3 (corresponding to receiving antenna unit 13) of the power measuring device 1-1 of the first embodiment shown in FIG. ), Variable phase shifter 16, mixer 17, LPF18, power ratio measurement unit 19, antenna reception power calculation unit 20 (β component), variable delay device 50, data storage unit 31, terminal. It includes a voltage calculation unit 33, an electric field strength calculation unit 34, a radiated power calculation unit 35, a display unit 36, and a distance measurement unit 51.

The power measuring device 2 of Example 2 shown in FIG. 6 and the power measuring device 5'of Example 3 shown in FIG. 9 are compared. Both power measuring devices 2, 5'are BPF10, 14, AMP11, 15, power measuring unit 12, receiving antenna unit 13, variable phase shifter 16, mixer 17, LPF18, power ratio measuring unit 19, antenna receiving power calculation. It is common in that it includes a unit 20, a data storage unit 31, a terminal voltage calculation unit 33, an electric field strength calculation unit 34, a radiated power calculation unit 35, and a display unit 36. On the other hand, the power measuring device 5'is different in that the distance measuring unit 51 is provided instead of the distance measuring unit 32 of the power measuring device 2, and the variable delay device 50 is further provided. In FIG. 9, the parts common to FIG. 6 are designated by the same reference numerals as those in FIG. 6, and detailed description thereof will be omitted.

The BPF 10 inputs the satellite broadcast signal received by the antenna 6, filters the satellite broadcast signal to select a predetermined measurement frequency, and outputs the filtered frequency band signal to the AMP 11. do. As a result, a signal having a measurement frequency is selected from the satellite broadcast signal.

The AMP 11 inputs a signal of the filtered (selected) frequency band from the BPF 10, amplifies the signal of the filtered frequency band, and uses the amplified signal as a satellite broadcast signal for the variable delay device 50 and distance measurement. Output to unit 51.

The variable delayer 50 delays the satellite broadcasting signal by inputting the satellite broadcasting signal from the AMP 11 and inputting the phase information from the distance measuring unit 51 and adjusting the phase of the satellite broadcasting signal based on the phase information. Then, the variable delay device 50 outputs the phase-adjusted satellite broadcast signal to the power measuring unit 12 and the mixer 17.

As will be described later, the phase information output by the distance measuring unit 51 is the phase information of the satellite broadcasting signal so that the time difference between the satellite broadcasting signal and the leaked radio wave is sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal. This is adjustment information for delaying the phase. Therefore, the variable delayer 50 has the phase of the satellite broadcast signal based on this phase information so that the time difference between the satellite broadcast signal and the leaked radio wave is sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal. To adjust.

The distance measuring unit 51 measures the distance between the antenna 3 of the power measuring device 5'and the receiving equipment 100, and outputs the measured distance d to the radiated power calculation unit 35 and the display unit 36.

The distance measuring unit 51 includes A / D conversion units 52 and 53, a phase comparison unit 54, a delay amount calculation unit 55, and a distance calculation unit 56. The A / D conversion unit 52 inputs a satellite broadcast signal from the AMP 11, A / D converts the analog satellite broadcast signal into a digital satellite broadcast signal, and outputs the digital satellite broadcast signal to the phase comparison unit 54.

The A / D conversion unit 53 inputs a leaked radio wave signal from the AMP 15, A / D converts the analog leaked radio wave signal into a digital leaked radio wave signal, and transmits the digital leaked radio wave signal to the phase comparison unit 54. Output.

The phase comparison unit 54 inputs a digital satellite broadcast signal from the A / D conversion unit 52 and a digital leaked radio signal from the A / D conversion unit 53, and receives a characteristic signal sequence of the satellite broadcast signal ( For example, TMCC (transmission control signal)) or the like is used to calculate the phase difference between the two signals. Then, the phase comparison unit 54 outputs the phase difference to the delay amount calculation unit 55.

The delay amount calculation unit 55 inputs the phase difference from the phase comparison unit 54, calculates the delay amount between the two signals based on the phase difference, and outputs the delay amount to the distance calculation unit 56. Further, the delay amount calculation unit 55 calculates the time difference Δt from the delay amount.

The time difference Δt means that, assuming that the power measuring device 5'inputs the receiving equipment signal from the receiving equipment 100, the receiving equipment signal output from the receiving equipment 100 and the leaked radio wave radiated from the receiving equipment 100 correspond to each other. It corresponds to the time difference until it is input to the power measuring device 5.

The delay amount calculation unit 55 generates phase information for delaying the phase of the equipment-side signal so that the time difference Δt is sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal, and the phase information Is output to the variable delay device 50. As a result, the time difference between the satellite broadcast signal and the leaked radio wave output by the variable delay device 50 becomes sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal.

The distance calculation unit 56 inputs the delay amount from the delay amount calculation unit 55, and calculates the distance between the antenna 3 of the power measuring device 5'and the receiving equipment 100 based on the delay amount. Then, the distance calculation unit 56 outputs the measurement distance d to the radiant power calculation unit 35 and the display unit 36.

The terminal voltage calculation unit 33 calculates the terminal voltage Et by the above formula (18), and outputs the terminal voltage Et to the electric field strength calculation unit 34 and the display unit 36.

The electric field strength calculation unit 34 calculates the electric field strength E by the above formula (19), and outputs the electric field strength E to the radiant power calculation unit 35 and the display unit 36.

The radiant power calculation unit 35 inputs the electric field strength E from the electric field strength calculation unit 34, inputs the measurement distance d from the distance calculation unit 56 of the distance measurement unit 51, and calculates the radiant power Pt by the above formula (20). Calculate and output the radiant power Pt to the display unit 36.

The display unit 36 inputs the measurement distance d from the distance measurement unit 56, the terminal voltage Et from the terminal voltage calculation unit 33, the electric field strength E from the electric field strength calculation unit 34, and the radiated power Pt from the radiated power calculation unit 35. .. Then, the display unit 36 displays the measurement distance d, the terminal voltage Et, the electric field strength E, and the radiated power Pt.

As described above, according to the power measuring device 5'of the third embodiment, the distance measuring unit 51 sets the distance (measured distance d) between the antenna 3 and the receiving equipment 100 as the signal of the satellite broadcast and the leaked radio wave. Measure using the phase difference of the signal.

The terminal voltage calculation unit 33 calculates the terminal voltage Et based on the antenna reception power Pr calculated by the antenna reception power calculation unit 20. The electric field strength calculation unit 34 calculates the electric field strength E based on the terminal voltage Et and various data (wavelength, antenna gain, loss, gain G _{2 of AMP 15) corresponding to the measurement frequency.} The radiant power calculation unit 35 calculates the radiant power Pt based on the electric field strength E and the measurement distance d.

As a result, when the power measuring device 5'cannot acquire the output signal of the receiving equipment 100, the receiving equipment 100 uses the output signal (satellite broadcasting signal) of its own antenna 6 instead of the output signal of the receiving equipment 100. Weak radio waves leaking from the antenna can be measured easily and with high accuracy. This measuring method is effective when the power measuring device 5'is located outdoors away from the receiving equipment 100. The same applies to the power measuring device 5 provided with the distance measuring device 62 shown in FIG.

Generally, in order to measure weak leaked radio waves, it is necessary to bring the antenna 3 closer to the receiving equipment 100 to some extent, but if the distance is shortened, the changes in the antenna receiving power Pr, the terminal voltage Et, and the electric field strength E become large. It ends up. Therefore, in order to measure the radiant power Pt with high accuracy, it is necessary to measure the distance with high accuracy. Since the measurement distance d is measured by the power measuring device 5'using the phase difference between the satellite broadcast signal and the leaked radio signal, the accuracy can be improved, and as a result, the radiated power Pt is measured with high accuracy. can do.

Further, the power measuring device 5'measures the antenna reception power Pr, the terminal voltage Et, the electric field strength E and the measurement distance d at the same time. Since the measured antenna reception power Pr, terminal voltage Et, and electric field strength E correspond to the measurement distance d measured at that time, the radiated power Pt can be measured with higher accuracy. The same applies to the power measuring device 5 provided with the distance measuring device 62 shown in FIG.

Further, this power measuring device 5'is a component unit that handles laser light in order to measure the distance between the antenna 3 and the receiving equipment 100 as compared with the power measuring device 2 of the second embodiment shown in FIG. Is unnecessary. As a result, the size of the entire device is reduced, and the configuration is simple.

The power measuring device 5'of Example 3 shown in FIG. 9 is provided with the configuration of the power measuring device 1-1 of the first embodiment shown in FIG. 2 (β in FIG. 9). .. Instead of this, the power measuring device 5'may include the power measuring device 1-2 of the second embodiment shown in FIG. Further, the power measuring device 5'may include the power measuring device 1-3 of the third embodiment shown in the first embodiment shown in FIG.

On the other hand, the power measuring device 2 of the second embodiment shown in FIG. 6 further includes the variable delay device 50 provided in the power measuring device 5'of the third embodiment shown in FIG. 9, the AMP 11 and the power measuring unit 12 and the power measuring unit 12. It may be provided between the branch point of the mixer 17 and the branch point. In this case, the distance calculation unit 42 of the distance measurement unit 32 calculates the delay amount between the equipment side signal and the leaked radio wave signal based on the phase difference input from the light receiving unit 41, and calculates the time difference Δt from the delay amount. do. Then, the distance calculation unit 42 generates phase information so that the time difference Δt is sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal, and outputs the phase information to the variable delay device 50.

The variable delay device 50 inputs a satellite broadcast signal from the AMP 11, and also inputs phase information from the distance calculation unit 42 of the distance measurement unit 32, and adjusts the phase of the satellite broadcast signal based on the phase information to perform satellite broadcasting. Delay the signal. Then, the variable delay device 50 outputs the phase-adjusted satellite broadcast signal to the power measuring unit 12 and the mixer 17.

As a result, the variable delay device 50 outputs the satellite broadcast signal when the time difference between the satellite broadcast signal and the leaked radio wave is sufficiently smaller than the one-symbol duration (1 / symbol rate) of the signal.

Although the present invention has been described above with reference to Examples 1 to 3, the present invention is not limited to the above Examples 1 to 3, and can be variously modified without departing from the technical idea. For example, in the first to third embodiments, the receiving equipment 100 may be equipment for satellite broadcasting that receives BS / CS waves, or may be equipment that receives radio waves other than BS / CS waves. Further, in the first to third embodiments, the power of the leaked radio wave radiated from the receiving equipment 100 is measured, but it is radiated from equipment other than the receiving equipment 100 (including various equipments such as receiving equipment). The power of the leaked radio wave may be measured.

There is a tendency that the permissible value is specified for the level of the electric wave of the radio wave leaking from the receiving equipment 100, and in the future, it will be necessary to confirm whether the radio wave leakage is within the permissible value from the installed receiving equipment 100. The present invention is used as a power measuring device capable of easily and accurately measuring the power of leaked radio waves.

1,2,5 Power measuring device 3,6 Antenna 4 Display 10,14 BPF (Bandpass filter)
11,15 AMP (amplifier)
12 Power measurement unit 13 Reception antenna unit 16 Variable phase shifters 17, 24 Mixer 18 LPF (low-pass filter)
19, 22, 26 Power ratio measurement unit 20 Antenna reception power calculation unit 21, 25 HPF (high-pass filter)
23 Oscillator 31 Data storage unit 32,51 Distance measurement unit 33 Terminal voltage calculation unit 34 Electric field strength calculation unit 35 Radiant power calculation unit 36 Display unit 40 Light emitting unit 41 Light receiving unit 42,56 Distance calculation unit 50 Variable delay device 52, 53 A / D conversion unit 54 Phase comparison unit 55 Delay amount calculation unit 60 BS / 110 degree CS
61 Measuring vehicle 62 Distance measuring device 100 Reception equipment 101 Coaxial cable

Claims (8)

In a power measuring device that receives leaked radio waves radiated from a device that inputs the signal of the received radio waves and measures the power of the leaked radio waves.
An output signal based on the radio wave signal is input from the device, and a signal having a predetermined frequency in the output signal is used as a device side signal to measure the power of the device side signal.
The receiving antenna unit that receives the leaked radio waves and
Along with inputting the device side signal, a signal having a predetermined frequency in the leaked radio signal received by the receiving antenna unit is input as a leak signal, the device side signal and the leak signal are mixed, and the mixed signal is produced. With the mixer to generate
A power ratio measuring unit that calculates the power of the mixed signal generated by the mixer and measures the power ratio between the device side signal and the leaked signal based on the power of the mixed signal and a predetermined parameter. When,
A power calculation unit that calculates the power of the leaked radio wave based on the power of the device-side signal measured by the power measurement unit and the power ratio measured by the power ratio measurement unit.
A power measuring device characterized by being equipped with. In the power measuring device according to claim 1,
Further, a leak signal variable phase shifter that inputs predetermined phase information and changes the phase of the leak signal based on the phase information.
A first filter that inputs the mixed signal generated by the mixer and performs LPF (low-pass filter) filtering on the mixed signal is provided.
The mixer
The leak signal whose phase has changed is input by the leak signal variable phase shifter, the device side signal and the leak signal whose phase have changed are mixed, and the mixed signal is generated to generate the first filter. Output to
The power ratio measuring unit
The phase information for changing the phase of the leaked signal is generated, and the phase information is output to the leaked signal variable phase shifter.
The mixed signal after filtering is input from the first filter for each phase information, the power of the mixed signal is calculated, and the maximum value of the power of the mixed signal for each phase information is specified. A power measuring device for measuring the power ratio based on a maximum value of the power of the mixed signal and a predetermined parameter. In the power measuring device according to claim 1,
Further, a device-side signal variable phase shifter that inputs predetermined phase information and changes the phase of the device-side signal based on the phase information,
A second filter that inputs the mixed signal generated by the mixer and performs LPF (low-pass filter) filtering on the mixed signal is provided.
The power measuring unit
The device-side signal whose phase has changed is input by the device-side signal variable phase shifter, and the power of the device-side signal is measured.
The mixer
The device-side signal whose phase has changed by the device-side signal variable phase shifter is input, the device-side signal and the leakage signal are mixed, and the mixed signal is generated and output to the second filter. ,
The power ratio measuring unit
The phase information for changing the phase of the leaked signal is generated, and the phase information is output to the device-side signal variable phase shifter.
The mixed signal after filtering is input from the second filter for each phase information, the power of the mixed signal is calculated, and the maximum value of the power of the mixed signal for each phase information is specified. A power measuring device for measuring the power ratio based on a maximum value of the power of the mixed signal and a predetermined parameter. In the power measuring device according to claim 1,
Further, a third filter for inputting the mixed signal generated by the mixer and performing HPF (high-pass filter) filtering on the mixed signal is provided.
The power ratio measuring unit
The mixed signal after filtering is input from the third filter, the power of the mixed signal is calculated, and the power ratio is measured based on the power of the mixed signal and a predetermined parameter. Power measuring device. In the power measuring device according to claim 1,
Further, an oscillator that outputs an oscillator signal for shifting the frequency of the device side signal, and an oscillator that outputs an oscillator signal.
A device-side signal mixer that mixes the device-side signal and the oscillator signal output by the oscillator and generates the device-side signal after mixing.
A fourth filter that performs HPF (high-pass filter) filtering on the mixed device-side signal generated by the device-side signal mixer, and
A fifth filter, which inputs the mixed signal generated by the mixer and performs LPF (low-pass filter) filtering on the mixed signal, is provided.
The power measuring unit
The device-side signal after filtering is input from the fourth filter, and the power of the device-side signal is measured.
The mixer
The device-side signal after filtering is input from the fourth filter, the device-side signal and the leakage signal are mixed, the mixed signal is generated, and the signal is output to the fifth filter.
The power ratio measuring unit
The mixed signal after filtering is input from the fifth filter, the power of the mixed signal is calculated, and the power ratio is measured based on the power of the mixed signal and a predetermined parameter. Power measuring device. In the power measuring device according to any one of claims 1 to 5.
Further, a distance measuring unit that measures the distance between the receiving antenna unit and the device,
A radiant power calculation unit that calculates the radiant power of the leaked radio wave based on the power of the leaked radio wave calculated by the power calculation unit and the distance measured by the distance measuring unit.
A power measuring device characterized by being equipped with. In the power measuring device according to claim 6,
The distance measuring unit
A predetermined laser light is irradiated toward the device, the laser light reflected by the device is input, the phase difference between the irradiated laser light and the input laser light is obtained, and the phase difference is based on the phase difference. A power measuring device characterized in that the distance is measured. In a power measuring device that receives leaked radio waves radiated from a device that inputs the signal of the received radio waves and measures the power of the leaked radio waves.
A first antenna that receives the same radio wave signal as the radio wave signal input by the device, and
The signal of the radio wave received by the first antenna is input, the signal of a predetermined frequency in the signal of the radio wave is used as the radio wave signal, and the power of the radio wave signal is the power of the device side signal which is the signal power of the device. And the power measuring unit to measure as
The second antenna that receives the leaked radio waves and
Along with inputting the radio wave signal, a signal having a predetermined frequency in the leaked radio wave signal received by the second antenna is input as a leaked signal, and the radio wave signal and the leaked signal are mixed to generate a mixed signal. Mixer and
A power ratio measuring unit that calculates the power of the mixed signal generated by the mixer and measures the power ratio between the radio wave signal and the leaked signal based on the power of the mixed signal and a predetermined parameter. ,
A power calculation unit that calculates the power of the leaked radio wave based on the power of the device-side signal measured by the power measurement unit and the power ratio measured by the power ratio measurement unit.
A distance measuring unit that obtains a phase difference between the radio wave signal and the leaked signal and measures the distance between the second antenna and the device based on the phase difference.
A radiant power calculation unit that calculates the radiant power of the leaked radio wave based on the power of the leaked radio wave calculated by the power calculation unit and the distance measured by the distance measuring unit.
A power measuring device characterized by being equipped with.

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