JP2570352B2 - Radio wave radiation source guidance device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave radiation source guidance device, such as a radio wave radiation source missile, which requires tracking guidance for a radio wave radiation source.

[Conventional technology]

FIG. 5 is a configuration diagram of a conventional radiation source guiding apparatus. In the figure, (1) is an antenna that receives radio waves from a plurality of radio wave radiation sources that generate pulses and can form two antenna beams that are partially overlapped, and (2) is an external control. A receiver that processes only a specific frequency band by a signal and generates a sum signal and a difference signal of two beams of the antenna (1), (3) an antenna servo for controlling the angle of the antenna (1), (4) Is an A / D converter that converts analog video signals from the receiver (2) to digital,
(5) a tracking gate for tracking only a signal having a specific pulse repetition number with respect to the signal from the A / D converter (4);
(6) a gate generator for generating the gate of the tracking gate (5); (7) indicates a difference in the direction of the radio wave radiation source with respect to the antenna (1) from the sum signal and the difference signal passing through the tracking gate (5). Angle error detector to calculate angle error, (8)
Is a lock-on determination unit for determining whether or not the tracking gate (5) is locked on a target signal which has detected whether or not the amplitude of the signal is greater than or equal to a predetermined value with respect to the sum signal passed through the tracking gate (5). From the lock-on information from the lock-on determiner (8) and the angle error information from the angle error detector (7), the angle control of the antenna servo (3), the frequency control of the receiver (2), and the control of the gate generator (6) A tracking guidance controller that controls the gate position, performs tracking control of the entire guidance system, and simultaneously transmits guidance control information to the mother machine.
Reference numeral 0) denotes a tracking data memory for storing a transmission frequency, a transmission pulse repetition number, and an initial position of a tracking target.

FIGS. 6 (a) and 6 (b) are diagrams for explaining the operation principle of the receiver (2) of the conventional radiation source guiding device, wherein (a) shows the frequency spectrum of the transmission wave of the radio wave radiation source, and (b) shows the receiver (2). This is the frequency spectrum of the output. When the target 1 is transmitting at the frequency of the band f4 as shown by X in FIG. 5A and the target 2 is transmitting at the band f7 as shown by Y in FIG. When a control signal is issued so as to select the frequency of f4, the output becomes as shown by Z in FIG. Utilizing the above principle, the conventional radiation source guidance apparatus has a configuration in which the tracking guidance control unit (9) designates the frequency band of the target to be tracked to the receiver (2) and performs the frequency tracking.

FIG. 7 shows a tracking gate (5) of a conventional radiation source guiding apparatus.
FIG. 9 is a diagram for explaining the operation principle of a gate generator (6) and a lock-on determination unit (8). In the figure, for example, when there is an input as shown in (a) and the gate generator (6) generates the gate timing as shown in (b), the output of the tracking gate (5) becomes the same. Since only one of the three pulses is output as shown in FIG. 3 (c), the lock-on determiner (8) does not make a lock-on determination. At the gate timing as shown in FIG. 3D, all three of the three pulses have outputs, and the lock-on determiner (8) makes a lock-on determination. As described above, in the conventional radiation source guidance device, the tracking guidance controller (9) instructs the gate generator (6) to generate a tracking gate signal corresponding to the number of pulse repetitions of the target to be tracked. If the output of the tracking gate (5) coincides with the received pulse, the lock-on decision unit (8) makes a lock-on decision.

FIG. 8 explains the operation of the entire conventional radiation source guiding apparatus based on the operating principle of the receiver (2), tracking gate (5), gate generator (6), and lock-on decision unit (8). This is an operation flowchart. In step (23), the tracking guidance controller (9) reads from the tracking data memory (10) the transmission frequency band of the target to be tracked, the pulse repetition number,
Select the approximate direction, and in step (24), first select the receiver (2).
Frequency band to be tracked, pulse repetition number to be tracked to gate generator (6) in step (25), step (26)
Sets the approximate direction data of the target to be tracked by the antenna servo (3). The reception frequency from the radio wave radiation source and the pulse repetition number match the data set by the tracking guidance controller (9), and the lock-on decision unit (8) performs the step (27).
When the lock-on determination is made in step (28), the angle error is detected in the angle error detector (7) for the data in step (28), and the tracking guidance controller (9) determines the target lock-on determination in step (29). Then, at the same time as entering angle tracking using the angle error detection data, a guidance control signal for accurately guiding the base unit to radio wave emission is output to the base unit.

[Problems to be solved by the invention]

In the above radio wave radiation source guidance device, for example, when the radio wave radiation source transmits by switching a plurality of transmission frequencies,
Since the lock-on of the lock-on determiner (8) goes off every time the transmission frequency of the radio wave radiation source is switched, the tracking dielectric controller (6) performs the tracking operation again from the beginning. There is a problem in that the time during which the tracking is performed is reduced, and it is difficult to track the stable radio wave radiation source and to guide the stable base unit.

Further, for example, when the radio wave radiation source transmits a plurality of transmission pulse repetitions, the tracking guidance performance is deteriorated for the same reason as described above.

For example, when there are a plurality of radio wave radiation sources, the conventional device has a configuration in which only one radio wave radiation source is angle-tracked, so that only a single target can be identified. .

For example, in the case where the radio wave radiation source transmits while switching radio wave parameters other than the transmission frequency and the transmission pulse repetition number, for example, the transmission pulse width, the gate width of the tracking gate (5) is fixed in the conventional device. However, there is a problem that only the transmission wave having a single pulse width can be dealt with because the tracking is performed while the tracking is performed.

In addition, when the radio wave radiation source transmits a signal having a special pulse interval such as a pulse compression wave by linear FM modulation or Barker code, the tracking gate (5) immediately follows the same tracking gate timing as the reception wave. There was a drawback that it was not possible to generate and tracking was not possible.

Also, for example, in the case where a radio wave radiation source interferes with a radio wave using a plurality of transmission frequencies, a plurality of pulse repetitions, and a plurality of pulse widths, the conventional apparatus does not want to track a signal processor. As a result, the amount of data to be processed increases, and it takes too much time to enter the tracking state, or the tracking state cannot be entered.

In addition, for example, a large number of radio wave radiation sources have the same transmission frequency,
Even if the same pulse repetition rate and the same pulse width are transmitted and the guiding device interferes with the tracking of the radio emission source that the user wants to track, the processing is performed in the same manner as when the radio interference is received. The amount of data to be recorded increases, and it takes a long time to enter the tracking state, or there is a problem that the tracking is mistakenly performed for another target.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a target memory has a structure in which a pulse arrival time and a pulse amplitude of a radio wave radiation source are continuously changed according to a frequency, a pulse width, and an angle of a radio wave radiation source with respect to an antenna. By writing multiple radio wave radiation sources and multiple transmission frequencies,
An object of the present invention is to continuously track a radio wave radiation source emitting a large number of transmission pulse repetitions and a plurality of pulse widths, and to stably and accurately guide the mother device to the radio wave radiation source.

Also, by performing a correlation processing operation on the target memory data, an object is to accurately identify even a special pulse repetition number pattern such as linear FM modulation or a Barker code.

In addition, by using an unnecessary wave remover that removes unnecessary reception waves such as jamming waves, the number of data handled in the subsequent signal processing is reduced, and the purpose is to accurately and quickly identify a target radio wave radiation source. I do.

[Means for solving the problem]

The radio wave radiation source guiding apparatus according to the present invention has an antenna whose angle is controlled by an antenna servo, has a receiver that inputs a received signal from the antenna, and outputs a sum signal and a difference signal of the received signal. , Has a frequency discriminator that discriminates the frequency of the received wave received by the antenna, and has an amplitude detector, pulse arrival time detector, pulse width detector, and angle error detector after the A / D converter. Eliminate unnecessary outputs from the discriminator output, pulse arrival time detector output, pulse width detector output, and angle error detector output, that is, the frequency and pulse arrival of the radio wave radiation source required for each received radio wave radiation source It has an unnecessary wave remover that does not output any data other than the data corresponding to the time, pulse width, and angle error signals. The frequency control data and pulse width data that passed through the unnecessary wave remover, the angle control data, and the angle It has an address generator that generates an address to be written to the memory from the error data, and has a target memory that writes the amplitude data and the pulse arrival time based on the address generated by the address generator. It has a tracking data memory that stores the time, and has a pulse analyzer that identifies the transmitted wave of the radio wave radiation source by correlating the reference data in the tracking data memory with the data of the received wave in the target memory. , Pulse repetition rate data from a pulse analyzer, transmitted wave data such as angular error data and pulse width data written in a target memory, frequency data from a frequency discriminator, and antenna angle data from an antenna servo. It has a tracking guidance controller that guides the mother machine stably to the radio wave radiation source.

[Action]

In the present invention, the tracking guidance controller receives the frequency data output from the frequency discriminator and passed through the unnecessary wave remover, and can immediately control the receiving frequency band of the receiver and the address control of the target memory. Therefore, even when the radio wave radiation source transmits a signal by switching a plurality of transmission frequencies, by immediately controlling the receiver and controlling the address of the target memory, the amplitude and pulse arrival of the transmission wave from the radio wave radiation source can be obtained. Most of the time can be continuously written to the target memory, and by continuously processing the transmission wave data of the target memory, stable tracking of the radio wave radiation source and guidance of the mother machine can be performed. In addition, by storing the long pulse arrival time in the target memory, the pulse arrival time can be recorded continuously even when the radio wave radiation source changes the pulse repetition rate and transmitted. Tracking and guidance of the mother machine can be performed.

The address generator outputs radio waves based on the data output from the pulse width detector and passed through the unnecessary wave remover, the data output from the angle difference detector and passed through the unnecessary wave remover, and the transient control data of the antenna. Since the pulse arrival time and pulse width data of the radio wave radiation source can be written to the target memory in a state where the pulse width and angle of the source are classified, for example, even if a plurality of radio wave emission power sources exist in the antenna beam, a large number of The transmission wave data from the radio wave radiation source can be stored in a state of being divided for each angle. Further, for example, even if the transmission wave is transmitted while switching a plurality of pulse widths, the transmission wave data can be stored in a state classified by the pulse width. For the above reasons, it is possible to track a plurality of radio wave radiation sources, to continuously track a radio wave radiation source generated while switching a plurality of pulse widths, and to guide the mother machine.

In addition, the pulse analyzer performs a convolution integration, that is, a correlation process, on the amplitude data on the time axis written in the target memory with a reference function written in the tracking data memory, thereby obtaining a pulse compression wave. It is also possible to identify a special received wave such as

In addition, the spurious wave remover can remove the information that you do not want to track from among multiple frequency information, multiple pulse repetition rate information, multiple pulse width information, and multiple angle error information. Can provide only the minimum necessary information.

For the above reasons, for example, when a radio wave radiation source interferes using a plurality of pulse repetition rates, a plurality of pulse widths, and a plurality of frequencies, or when a large number of radio wave radiation sources have the same pulse repetition rate and the same pulse width The target can be identified and tracked by performing the minimum necessary signal processing even in the case of interference using the same frequency. It is possible to guide.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
(1) to (4), (7) and (10) are exactly the same as the above-mentioned conventional apparatus. (11) is a frequency discriminator for discriminating the frequency of the received signal input to the antenna (1), and outputs the discriminated frequency information as a digital signal. (12) is A / D
An amplitude detector for detecting the amplitude of the sum signal output of the converter (4), (13) a pulse arrival time detector for detecting a pulse arrival time for the sum signal data, and (14) a pulse arrival time detector for the sum signal data Pulse width detector to detect pulse width, (22
a) (22b) (22c) (22d), output of frequency discriminator (11), output of pulse arrival time detector (13), output of pulse width detector (14), and output of angle error detector (7) For the output, remove unnecessary data for the subsequent processing, that is, output only data corresponding to the frequency, pulse arrival time, pulse width, and angle error signal of the radio wave radiation source required for each received radio wave radiation source. The first, second, third, and fourth unnecessary wave removers (hereinafter, referred to as first, second, third, and fourth removers) and (16) are the output of the amplitude detector (12) and The pulse arriving time detector (13) outputs the second eliminator (22
b) It is a target memory that stores the time of arrival of the pulse that has passed through, and has a sufficient capacity to record the transmission wave data of the radio wave radiation source. (15) is the writing position based on the frequency, pulse width, and angular error after passing through the first, third, and fourth removers (22a), (22c), and (22d) when writing data to the target memory (16). This is an address generator that generates a write address that can classify the data, and generates an address that can freely read only necessary data from the classified data when reading.

(17) is a pulse analyzer for analyzing information such as the pulse repetition number based on the pulse arrival time data written in the target memory (16), and (9) is a target memory (16)
, Amplitude data, frequency data, angle data, frequency data from frequency discriminator (11), antenna angle data from antenna servo (3), and pulse repetition number data from pulse analyzer (17) Thus, the tracking guidance controller which performs tracking of the target radio wave radiation source and guides the mother machine, performs tracking control of the entire apparatus.

FIG. 2 is a diagram showing the internal configuration of the pulse analyzer (17). (18) is an FFT operation circuit that performs FFT signal processing on the pulse arrival time and amplitude data of the target memory (16). ) Is a multiplier that performs multiplication signal processing on the frequency axis, and (20) is an IFFT operation performed on the output of the multiplier (19)
The IFFT operation circuit (21) is a concentrator that outputs 1 when an amplitude equal to or greater than a certain threshold value read from the tracking data memory (10) is output to the output of the IFFT operation circuit (20).

In the radiation source guidance device configured as described above, the frequency discriminator (11) discriminates the frequency of the reception wave received by the antenna (1), and the tracking guidance controller (9)
By performing the reception frequency control so that the receiver (2) receives the discriminated frequency, it is possible to always receive the transmission wave data from the radio wave radiation source.

The sum signal and the difference signal from the receiver (2) are converted into digital data by the A / D converter (4), and the amplitude, pulse arrival time, pulse width, and angle error are detected.

Among the above data, the amplitude data and the second remover (22
The pulse arrival time data passed through b) is written to the target memory (16) having sufficient capacity, and then tracked.
Because it is used as information for guidance,
Even if the number of pulse repetitions of the received wave changes irregularly, it is written in the target memory (16) as the irregular pulse arrival time corresponding to the number of pulse repetitions, and all received pulse information can be recorded. it can.

Furthermore, the address generator (1) of the target memory (16)
5) is the reception frequency data instructed from the tracking guidance controller (9) to the receiver (2), the angle control data instructed to the antenna servo (3) and the angle error data outputted from the angle error detector (7), and the fourth removal. Third error remover (22c) output from the angular error data and pulse width detector (14) passed through the remover (22d)
Since the pulse width data that has passed through is used as an address of the target memory (16), a plurality of radio wave data can be written in a classified form. Fig. 3
FIG. 4 is a diagram illustrating a state in which two radio frequency radiation sources are written in the target memory (16) in a classified form, wherein the two radio frequency radiation sources are written in X and Y in a memory space and are different from each other. This shows that even if signals are transmitted at angles D1 and D2, different transmission frequencies f1 and f2, and different pulse widths W1 and W2, if the respective pulses are not input simultaneously in time, they can be clearly identified in the memory space. .

The address generator (15) is connected to the target memory (1
6) Since time-series data can be written continuously, even if multiple radio wave radiation sources transmit multiple transmission frequency emissions and multiple pulse widths,
The radio wave data is continuously stored in the target memory (16) in an organized manner, and there is no overhead time for tracking the radio wave data of the radio wave radiation source.

In the pulse analyzer (17), for example, when the radio wave radiation source transmits a pulse compression wave modulated by the linear FM modulation method, the signal is first written to the target memory (16) by the FFT operation circuit (18). The amplitude data of the received wave on the time axis is Fourier-transformed and converted into data on the frequency axis. On the other hand, in response to an instruction from the tracking guidance controller (9), the tracking data memory (10) outputs, as reference data, a complex contraction function of the frequency spectrum of the transmission wave of the radio wave radiation source to be tracked, and the multiplier (19) Perform multiplication. Multiplication on the frequency axis has the same meaning as convolution integration on the time axis,
If the reference data matches the complex contract function data of the frequency spectrum of the received wave, the multiplier (1
9) If the output is converted to data on the time axis by the IFFT operation circuit (20), it is output as a compressed pulse.

If the radio wave radiation source is transmitting, for example, with a pre-compression amplitude of 1 and a compression ratio of 10, the comparator (21) determines, for example, 9 as the threshold value, and if the IFFT calculator output is 9 or more, the tracking guidance The controller (9) determines that the specified pulse has been detected, and notifies the tracking guidance controller (9) of the output value 1.

FIG. 4 is a diagram for explaining the correlation calculation in the pulse analyzer (17). When an FFT operation is performed by the FFT operation circuit (18) on the pulse-compressed waveform by the linear FM modulation in the target memory (16) as shown in FIG. 7A, the output becomes as shown in FIG. FIG. 9C shows reference data read from the tracking data memory (10). When the output of FIG. 9B is multiplied by the output of FIG. Is as shown in FIG. 3D, which is the frequency spectrum of the pulse wave having the same phase. By performing the IFFT on the output of FIG. 4D by the IFFT operation circuit (20), the pulse-like compressed waveform shown in FIG. 5E is obtained.

The eliminator (22) is a pulse arrival time detector (1
3), pulse width detector (14), angle error detector (7),
Since the output from the frequency discriminator (11) can be removed from the output that is not desired to be tracked or searched, and can be passed through to subsequent processing, for example, the radio wave radiation source can be used at multiple transmission frequencies and multiple transmission frequencies. In the case where radio interference is caused by mixing the pulse repetition number and multiple pulse widths simultaneously, unnecessary frequency data, pulse repetition number data and pulse width data are removed from the process of identifying the radio emission source. Only necessary data can be used. Therefore, the amount of data used for signal processing for identifying a target radio wave radiation source can be minimized, so that signal processing can be performed quickly and accurately.

Also, for example, when many radio wave radiation sources transmit the same transmission frequency, the same pulse repetition rate, and the same pulse width, and the guiding device originally interferes with the tracking of the radio wave radiation source that you want to track. However, by allowing only the necessary output to pass through the output of the angle error detector (7), the identification processing of the radio wave radiation source can be minimized as in the above example, so that the signal processing can be performed quickly and Can do exactly.

By the way, in the above description, the processing of the antenna angle data is limited to two directions, for example, only one direction in the up and down direction. It goes without saying that the same tracking guidance control can be performed even if the processing of the vertical and horizontal directions is performed.

In the above description, the pulse analyzer (17) performs multiplication on the frequency axis in order to perform the correlation processing operation. However, the same result can be obtained by performing convolution integration on the time axis. It goes without saying that it can be obtained.

In the description of the operation of the remover (22), the case where a single radio wave radiation source interferes at multiple frequencies and the like and the case where multiple radio wave radiation sources interfere at a single frequency etc. are separately described. However, it is needless to say that a similar effect can be obtained even in a case where both types of interference are combined.

〔The invention's effect〕

According to the present invention, as described above, the radio wave radiation source discontinuously changes the transmission frequency and the like mainly by controlling the reception frequency in the receiver and using the target memory capable of efficiently classifying the recorded data. Also in this case, there is an effect that continuous data recording can be performed, stable guidance and tracking can be performed, and a plurality of data from a plurality of radio wave radiation sources can be handled.

Further, according to the present invention, since there is a pulse analysis function capable of discriminating a pulse by performing a correlation processing operation on a special modulation wave such as a pulse compression, there is an effect that accurate tracking can be performed.

Furthermore, according to the present invention, even when a single radio wave radiation source or a large number of radio wave radiation sources receive radio interference, the target radio wave radiation source can be identified more accurately and quickly by removing unnecessary reception waves. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing an embodiment of the present invention, in which a detailed block diagram of a pulse analyzer is shown. FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention. FIG. FIG. 5 is a diagram for explaining the operation of the pulse analyzer, FIG. 5 is a diagram showing a conventional radio wave radiation source guidance device, and FIGS. FIG. 4 is a diagram for explaining the operation of the radio wave radiation source guidance device. In the figure, (1) is an antenna, (2) is a receiver,
(3) Antenna servo, (4) A / D converter, (5)
Is a tracking gate, (6) is a gate generator, (7) is an angle error detector, (8) is a lock-on determination device, (9) is a tracking guidance controller, (10) is a tracking data memory, and (11) is a tracking data memory. Frequency discriminator, (12) amplitude detector, (13) pulse arrival time detector, (14) pulse width detector, (15) address generator, (16) target memory, (17) Pulse analyzer, (18) FFT operation circuit, (19) multiplier, (20) IFF
T operation circuit, (21) is a comparator, (22a) (22b) (2
2c) and (22d) are first, second, third, and fourth unnecessary wave removers. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

Claims (1)

(57) [Claims] An antenna for forming two antenna beams to receive radio waves from a plurality of radio wave radiation sources, an antenna servo for adjusting a direction of a beam of the antenna, and receiving a signal from the antenna. A receiver that outputs a sum signal and a difference signal of the two beams and can switch a frequency band to be received by an external control signal, and a frequency discriminator that discriminates a frequency of a reception signal received by the antenna, An A / D converter that converts the sum signal and the difference signal from the receiver into a digital signal, and calculates an angle error indicating a difference in direction of the radio wave radiation source with respect to the antenna based on the digitized sum signal and the difference signal. Angle error detector, from the digitized sum signal, the sum signal amplitude, pulse arrival time,
An amplitude detector, a pulse arrival time detector, and a pulse width detector that respectively detect a pulse width, and the frequency discriminator output, the pulse arrival time detector output, the pulse width detector output, and the angle error detector output are input, respectively. A first, a second, a third and a fourth remover for storing in a target memory data of a frequency, a pulse arrival time, a pulse width and an angle error signal of a radio wave radiation source necessary for each received radio wave radiation source. And the amplitude detector output and the second remover output,
A target memory for classifying and storing storage locations for each of the frequency, pulse width, and angle error output from the first, third, and fourth removers, and an address for writing and reading data to and from the target memory. An address generator to be generated, a tracking data memory in which the frequency spectrum of the transmission wave of the radio wave radiation source to be tracked is stored as reference data, and an amplitude data for each radio wave radiation source stored in the target memory are used. A frequency spectrum is obtained for each radio wave radiation source, and the frequency spectrum is compared with the reference data stored in the tracking data memory to identify a radio wave radiation source having a specific modulated wave from a plurality of radio wave radiation sources. And the angular error of the antenna with respect to the radio wave source identified by the pulse analyzer Versus radio source guiding apparatus is characterized in that a tracking guidance control unit to the signal for the mother ship derived is read from the target memory.