JPH0738021B2 - Radio wave radiation source induction device - Google Patents

Description

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

[Conventional technology]

FIG. 6 is a block diagram of a conventional radiation source induction device. In the figure, (1) is an antenna capable of receiving radio waves from a plurality of radio wave radiation sources that generate pulses and forming two antenna beams partially overlapped with each other, (2) is an external control The signal processes only certain frequency bands,
A receiver that generates a sum signal and a difference signal of the two beams of the antenna (1), (3) is an antenna servo that controls the angle of the antenna (1), and (4) is an analog video signal from the receiver (2). A / D converter that converts digital to digital, (5)
For the signal from the A / D converter (4), a tracking gate that tracks only a signal having a specific pulse repetition number, (6) is a gate generator that generates the gate of the tracking gate (5),
(7) is an angle error detector that calculates the angle error indicating the difference in the direction of the radio wave radiation source with respect to the antenna (1) from the sum signal and the difference signal that have passed through the tracking gate (5), and (8) is the tracking gate ( 5) A lock-on judger for judging whether or not the tracking gate (5) is locked on to the signal of the target that has detected whether the amplitude of the sum signal having passed through 5) is a certain value or more, and (9) is a lock-on judger. From the lock-on information from (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 gate position control of the gate generator (6). And tracking control of the entire guidance device, and at the same time transmits guidance control information to the mother machine, (10)
Is a tracking data memory that stores the transmission frequency of the tracking target, the number of transmission pulse repetitions, the initial position, and the like.

FIG. 7 is a diagram for explaining the operating principle of a receiver (2) of a conventional radiation source induction device, where (a) is the frequency spectrum of the transmitted wave of the radio wave radiation source, and (b) is the receiver (2). It 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. 7A 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 induction device has a configuration in which the tracking guidance control unit (9) designates the target frequency band receiver (2) to be tracked and performs frequency tracking.

FIG. 8 is a diagram for explaining the operation principle of the tracking gate (5), the gate generator (6) and the lock-on decision device (8) of the conventional radiation source induction device. In the figure, for example (a)
When the gate generator (6) is generating the gate timing as shown in (b) of the figure, the output of the tracking gate (5) is as shown in (c) of the figure. Since only one of the three pulses is output, the lock-on decision unit (8) does not make a lock-on decision. Further, at the gate timing as shown in FIG. 9D, three of the three pulses have outputs, and the lock-on decision unit (8) makes a lock-on decision. As described above, in the conventional radiation source induction device, the tracking induction controller (9) instructs the gate generator (6) to generate a tracking gate signal corresponding to the pulse repetition number of the target to be tracked, If the output of the tracking gate (5) coincides with the received pulse, the lock-on judging device (8) makes a lock-on judgment.

FIG. 9 illustrates the operation of the whole conventional anti-radiation source induction device based on the operation principle of the receiver (2), the tracking gate (5), the gate generator (6), and the lock-on decision device (8). It is an operation flow chart. The tracking guidance controller (9) selects the transmission frequency band, pulse repetition rate, and rough direction of the target to be tracked from the tracking data memory (10) in step (25), and first selects the receiver (2) in step (26). The frequency band to be tracked, the number of pulse repetitions to be tracked to the gate generator (6) at step (27), and the rough direction data of the target to be tracked to the antenna servo (3) at step (28) are set. When the reception frequency from the radio wave radiation source and the pulse repetition rate match the data set by the tracking guidance controller (9), the lock-on judgment device (8) makes a lock-on judgment at step (29), and at step (30) The angle error detector (7) detects the angle error with respect to the data, and the tracking guidance controller (9) makes a target lock-on determination in step (31) and uses the angle error detection data to perform the angle tracking. At the same time as it enters, it sends a guidance control signal to the mother machine to accurately guide the mother machine to radio wave radiation.

[Problems to be Solved by the Invention]

In the above-mentioned induction device for radio wave radiation sources, for example, when the radio wave radiation source switches and transmits a plurality of transmission frequencies, the lock-on of the lock-on judging device (8) is removed every time the transmission frequency of the radio wave radiation source is switched. Since the tracking guidance controller (9) restarts the tracking operation from the beginning again, the time for tracking the target radio wave radiation source is reduced, and stable tracking of the radio wave radiation source and stable guidance of the mother machine are achieved. There was a problem that it was difficult.

Further, for example, when the radio wave radiation source switches and transmits a plurality of transmission pulse repetition numbers, there is a problem that the tracking guidance performance deteriorates for the same reason as above.

Further, 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.

Further, for example, when the radio wave radiation source transmits while switching radio wave specifications other than the transmission frequency and the number of transmission pulse repetitions, for example, the transmission pulse width, the gate width of the tracking gate (5) is fixed in the conventional device. Since the tracking is performed as it is, there is a problem that only the transmitted wave with a single pulse width can be dealt with.

Further, in the conventional device, since the tracking state is entered through the step of setting parameters such as the reception frequency, the number of pulse repetitions and the angle, the radio wave radiation source to be tracked changes parameters such as a plurality of transmission frequencies and pulse widths. The number of combinations of parameters to be set before entering the tracking state when the transmission is performed and the radio wave radiation sources change the parameters such as the transmission frequency and the pulse width. Has become a huge amount, and there is a problem that it takes too much processing time to enter the tracking state.

The present invention has been made to solve the above problems, and the pulse arrival time and pulse amplitude of a radio wave radiation source are continuously stored in a target memory according to frequency, pulse width, and angle of the radio wave radiation source with respect to an antenna. By writing, the radio wave emission source that emits multiple radio wave radiation sources and multiple transmission frequencies, a large number of transmission pulse repetitions, and multiple pulse widths is continuously tracked, and the mother machine is stable and accurate. The purpose is to guide to a radio wave radiation source.

In addition, the purpose is to accurately identify the pulse repetition frequency of the radio wave radiation source by performing FFT processing on the target memory.

Further, the present invention writes the number of arrivals of the transmission pulse of the radio wave radiation source into the index memory in a form classified by frequency, pulse width and angle, so that the transmission of the radio wave radiation source received by the induction device. The purpose is to grasp the situation quickly and to perform the tracking process in the latter stage more accurately.

[Means for Solving the Problems]

The radio wave radiation source induction device according to the present invention has an antenna whose angle is controlled by an antenna servo, and has a receiver which inputs a reception signal from the antenna and outputs a sum signal and a difference signal of the reception 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. A target that has an address generator that generates a memory write address from control data, pulse width data, angle control data, and angle error data, and writes amplitude data and pulse arrival time based on the address generated by the address generator. It has a memory and a tracking data memory that stores the pulse repetition time of the radio wave source to be tracked, and the address generated by the address generator above. It has an index memory that writes the number of received waves above a certain amplitude value, and FFT processing is performed on the target memory data to identify the pulse repetition number of the radio wave radiation source. ，
Received data from the index memory, pulse repetition rate data from the pulse analyzer, transmitted wave data such as angular error data and pulse width data written in the target memory, frequency data from the frequency discriminator, and antenna servo. It has a tracking guidance controller that stably guides the mother machine to the radio wave radiation source based on the antenna angle data from.

[Action]

In this invention, since the tracking guidance controller receives the frequency from the frequency discriminator and can immediately control the reception frequency band of the receiver and the address control of the target memory, a plurality of radio wave radiation sources are provided. Even when the transmission frequency is switched, the receiver memory and the target memory address control are performed immediately, so that most of the amplitude and pulse arrival time of the transmission wave from the radio wave radiation source can be continuously targeted. , And by continuously processing the transmitted wave data in the target memory, stable radio wave radiation source tracking and mother machine guidance are possible. In addition, by recording a long pulse arrival time in the target memory, the pulse arrival time can be recorded continuously even when the radio wave radiation source switches and transmits a plurality of pulse repetition numbers. It is possible to track and guide the mother plane.

In addition, the address generator classifies the pulse width and angle of the radio wave radiation source according to the data of the pulse width detector, the data of the angle error detector, and the angle control data of the antenna, and the pulse arrival time and pulse of the radio wave radiation source are classified. Since the width data can be written in the target memory, for example, even if a plurality of radio wave radiation sources are present in the beam of the antenna, the transmitted wave data from a large number of radio wave radiation sources can be simultaneously stored in a state divided by 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 of being classified by the pulse width. For the above reasons, it becomes possible to track a plurality of radio wave radiation sources, continuously track a radio wave radiation source generated while switching a plurality of pulse widths, and guide the mother machine.

In the pulse analyzer, the pulse arrival time data recorded in the target memory is sampled at a frequency sufficiently higher than the pulse repetition rate of the radio wave radiation source, and then FFT processing is applied to determine the pulse repetition rate of the radio wave radiation source. Can be accurately identified.

Further, since the number of arrivals of the transmission pulse of the radio wave radiation source is stored in the index memory in a form classified by the frequency, the pulse width and the angle, the number of arrivals is the largest when the tracking signal processing is started. By starting processing from the radio wave radiation source, when the radio wave radiation source transmits by changing parameters such as multiple transmission frequencies and pulse widths, and when multiple radio wave radiation sources transmit multiple transmission frequencies and pulse widths, Even if you change the parameter and send it,
It is possible to efficiently determine the priority order to enter the tracking process, and at the same time, it is possible to analyze the data more accurately by performing the processes in order from the radio wave radiation source with the largest number of detections.

〔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 device. Reference numeral (11) is a frequency discriminator that discriminates the frequency of the received signal that has entered 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), a pulse arrival time detector for detecting the pulse arrival time of the sum signal data (13), and a pulse arrival time detector for the sum signal data (14). Pulse width detector for detecting pulse width, (16)
Is the above amplitude detector (12), pulse arrival time detector (13)
This is a target memory that stores the data of, and has sufficient capacity to record the transmitted wave data of the radio wave radiation source.

(22) is an index memory for writing the number of received waves having a predetermined amplitude value or more in the output data of the amplitude detector (12), and (15) is the target memory (16) and index memory (22). Error when writing data to
Generate a write address that can classify the write position by frequency, pulse width, etc., and when reading, generate an address that can freely read only the necessary data from the above classified data. It is an address generator.

(17) is a pulse analyzer that analyzes information such as the pulse repetition rate based on the pulse arrival time data written in the target memory (16), and (9) is amplitude data and frequency written in the target memory (16). Data, angle data,
The target radio wave radiation source is tracked by the frequency data from the frequency discriminator (11), the antenna angle data from the antenna servo (3), and the pulse repetition rate data from the pulse analyzer (17). This is a tracking guidance controller that guides the mother machine, and controls the tracking control of the entire device.

FIG. 2 is a diagram showing the internal structure of the pulse analyzer (17), in which (18) is sufficiently higher than the pulse repetition rate of the radio wave radiation source with respect to the pulse arrival time recorded in the target memory (16). This is an FFT calculation circuit that performs sampling at a frequency and performs FFT calculation. For example, 16-point FFT is performed at a sampling frequency of 16 KHz and frequency bins # 1 to # 4 are output. (19) is a comparator that performs pattern comparison on the output of the FFT operation circuit, for example ± 20% of the comparison value.
If a value within the range is input, 1 is output. Reference numeral (20) is a logical product creation circuit for performing a logical product operation on the output of the comparator (19).

FIG. 3 is a diagram showing the internal structure of the index memory (22), in which (19) is a constant value designated by the tracking guidance controller (9), for example, a value equal to or greater than half the maximum amplitude. Generates 1 when input from the amplitude detector (12), and 0 otherwise.
, (23) is a RAM (random access memory) in which the number of times of arrival of received waves above the certain amplitude value is written, and (24) is a comparator (19) output and a RAM (23) output. It is an adder that performs addition.

In the radiation source induction device configured as described above,
The frequency discriminator (11) discriminates the frequency of the received wave received by the antenna (1), and the tracking guidance controller (9) is set so that the receiver (2) receives at the discriminated frequency. By controlling the reception frequency, it becomes 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 pulse arrival time data are written in the target memory (16) with sufficient capacity and then used as information for tracking and guiding, so that the pulse of the received wave Even if the repetition rate changes irregularly, it is written in the target memory (16) as an irregular pulse arrival time corresponding to the pulse repetition rate, and all received pulse information can be recorded.

Further, the address generator (15) of the target memory (16)
Is the reception frequency data instructed to the receiver (2) from the tracking guidance controller (9), the angle control data instructed to the antenna servo (3), the angle error data and the pulse width detection from the angle error detector (7). Since the pulse width data from the device (14) is used as the address of the target memory (16), a plurality of radio wave data can be efficiently written in a classified form. FIG. 4 is a diagram explaining that two radio wave radiation sources are written in the target memory (16) in a classified manner. The two radio wave radiation sources are arranged in X and Y in the memory space. Even if they are written and transmitted at different angles D1 and D2, different transmission frequencies f1 and f2, and different pulse widths W1 and W2, if each pulse is not input simultaneously in time, it can be clearly identified in the memory space. Is shown.

The address generator (15) is a target memory (16).
Since time-series data can be written continuously in the target memory (16), even if multiple radio wave radiation sources are transmitting mixed transmission frequencies and multiple pulse widths, In this case, the radio wave data will be continuously stored in a organized form, and there is no overhead time for tracking the radio wave data of the radio wave radiation source.

In addition, in the pulse analyzer (17), the FFT operation circuit (1
8) is the FFT calculation after sampling the pulse arrival time data of the target memory (16) at a frequency sufficiently higher than the pulse repetition rate of the radio wave radiation source, for example, if the pulse repetition rate of the radio wave radiation source is about 2 KHz, , For example, 16-point FFT calculation is performed. Since each frequency bin output of the FFT calculator (18) outputs amplitude data only to the frequency bin corresponding to an integer multiple of the pulse repetition number of the radio wave radiation source,
By performing comparison with the comparison data of each frequency bin in the comparator (19) in the subsequent stage, the pattern matching processing of the transmission pulse pattern of the radio wave radiation source can be performed on the frequency axis. The comparison pattern generator (21) outputs the comparison value of the comparator (19) in response to the instruction of the tracking guidance controller (9), and the comparison pattern and the output pattern of the FFT calculator (18) are equal to each other. If so, 1 is output from the logical product creation circuit (20) to notify the tracking guidance controller (9) that the pulse repetition can be identified.

Fig. 4 is a diagram for explaining the operation of the above pulse analyzer (17). Each frequency when 16 KHz sampling and 16-point FFT processing are performed with pulse arrival time data with a pulse width of 1 µsec and a pulse repetition rate of 2 KHz. An example of the output amplitude of a bin is shown. If the FFT operation circuit (18) outputs, for example, frequency bins # 1 to # 4 in the pulse analyzer (17) shown in FIG. 2, the comparison pattern generator (21) outputs # 1 to # 4. For example, # 1 to #
If 0, 0.95, 0, 0.9 are entered in the order of 4, if the comparator (19) is in the range of ± 21% of the comparison value, the output value 1
, All comparators (19) have 1
Is output, the output of the logical product creation circuit (20) becomes 1, and the tracking guidance controller (9) is notified that the pulse has been identified.

In addition, in the index memory (22), the internal RAM
In (23), the number of past received pulses is the frequency, pulse width,
It is stored in the form classified by the angle. When the amplitude of the received wave is newly detected by the amplitude detector (12), it is first compared by the comparator (19) with the value specified by the tracking guidance controller (9), for example, half the maximum amplitude, If it is more than that value, 1 is output. At this time, the number of past received pulses having the same frequency, pulse width, and angle as the new received wave is read from the RAM (23) by the address controlled by the address generator (15). After being added to the output value 1 of the comparator (19) by the adder (24), it is written again at the same address. Tracking guidance controller (9)
Can read the received wave data of any frequency pulse width and angle from the RAM (23) in the index memory (22). The configuration of the memory map of the index memory (22) viewed from the tracking guidance controller (9) is the same as the configuration of the memory map of the target memory (16).

In the index memory (22) having the above-mentioned functions, even when the radio wave radiation source transmits by changing a plurality of transmission frequencies, pulse widths, etc., it is classified by frequency and pulse width. Since the number of incoming received pulses is stored in the form of a random number, the pulse with the highest number of received signals is given priority in the area of the RAM (23), and tracking processing such as pulse repetition number analysis is performed, resulting in an efficient and quick radio wave. The radiation source can be identified. Further, by performing processing such as pulse analysis from a pulse having a large number of received waves, more accurate identification processing becomes possible.

By the way, in the above description, the processing of the antenna angle data is limited to two antenna beams, for example, only in one direction in the upper and lower directions, but a plurality of beams, for example, a total of four antenna beams in the upper, lower, left and right directions are used. Needless to say, the same tracking guidance control can be performed by performing the processing of the angle in the vertical direction and the horizontal direction.

In the above explanation, the pulse analyzer (17) has an example of the data of the pulse repetition number without stagger, but
It goes without saying that even a transmission pattern with a special pulse repetition number such as a jitter can be identified by performing pattern matching processing on the frequency axis.

Further, in the description of the operation of the index memory (21), the case where the received wave is a single pulse has been described, but even in the case of a continuous wave, for example, continuous time is converted into the number of pulses. It goes without saying that efficient processing can be performed by processing.

〔The invention's effect〕

As described above, the present invention mainly uses the reception frequency control in the receiver and the use of the target memory capable of efficiently classifying the recorded data.
Even when the radio wave radiation source changes the transmission frequency discontinuously, continuous data recording can be performed, stable guidance and tracking can be performed, and multiple data from multiple radio wave radiation sources can be supported. The effect is that you can.

Further, according to the present invention, a pulse analyzer capable of accurately discriminating a pulse repetition rate pattern such as stagger or jitter by performing pattern matching processing on the frequency axis after performing FFT signal processing on a target memory. As a result, it has the effect of enabling accurate and stable tracking.

Further, according to the present invention, by using the index memory, the priority order of the radio wave radiation source for performing the tracking process can be efficiently determined, so that the radio wave radiation source can be tracked more quickly and accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is a detailed block diagram of a pulse analyzer according to an embodiment of the present invention, FIG. 3 is a detailed block diagram of an index memory according to an embodiment of the present invention, and FIG. FIG. 6 is a diagram for explaining the operation of the embodiment, an explanatory diagram of the target memory, FIG. 5 is a diagram for explaining one embodiment of the present invention, a diagram for explaining the operation of the pulse analyzer, and FIG. FIG. 7, FIG. 8, FIG. 8, and FIG.
The figure is a figure explaining operation | movement of the conventional radio wave radiation source induction device. In the figure, (1) is an antenna, (2) is a receiver,
(3) is an antenna servo, (4) is an A / D converter, (5)
Is a tracking gate, (6) is a gate generator, (7) is an angle error detector, (8) is a lock-on judger, (9) is a tracking guidance controller, (10) is a tracking data memory, and (11) is 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) comparator, (2
0) is a logical product creation circuit, and (21) is a comparison pattern generator. (22) is index memory, (23) is RAM, (2
4) is an adder. In the drawings, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] 1. An antenna configured to form two antenna beams to receive radio waves from a plurality of radio wave radiation sources, an antenna servo for adjusting the beam direction of the antenna, and a reception signal from the antenna. A receiver that outputs a sum signal and a difference signal of two beams and that can switch the frequency band to be received by a control signal from the outside; a frequency discriminator that discriminates the frequency of the received 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 an angular error that indicates the difference in the direction of the radio wave radiation source with respect to the antenna is calculated by the digitized sum signal and the difference signal. Angle error detector and sum signal amplitude, pulse arrival time from digitized sum signal,
An amplitude detector for detecting the pulse width, a pulse arrival time detector and a pulse width detector, the amplitude detector output and the pulse arrival time detector output, the frequency discriminator, the pulse width detector, the angle error detection The target memory that classifies and stores memory locations for each frequency, pulse width, and angular error detected by the detector, and the number of times of reception waves of a certain amplitude value or more among the output of the amplitude detector that is received is the same as the target memory. An index memory that classifies and stores memory locations according to frequency, pulse width, and angle error, an address generator that generates an address for writing and reading data in the target memory and index memory, and a radio wave radiation source to be tracked Tracking data memory that stores amplitude data corresponding to each frequency bin of The radio wave radiation source to be tracked is created by performing FET calculation after sampling the data at a frequency higher than the pulse repetition rate of the radio wave radiation source, and creating the amplitude data of each frequency bin, and storing the amplitude data in the tracking data memory. A pulse analyzer that identifies a radio wave radiation source having a transmission pattern with a specific pulse repetition number from among multiple radio wave radiation sources by comparing the amplitude data of each frequency bin of Wave reception frequency data is read, multiple radio wave radiation sources are selected in descending order of reception frequency data, and the angular error of the antenna with respect to the radio frequency radiation source identified by the pulse analyzer is read from the target memory and the mother machine induction A radio wave radiation source induction device, comprising: