JPH01210880A - Counter-radio wave radiation source guidance system - Google Patents

Abstract

PURPOSE:To exactly execute the guidance tracking by providing a tracking target memory for storing radio wave particulars, etc., generated by a target to be tracked and a pulse analyzer for analyzing a pulse repeat number, etc., and discriminating a special pulse interval. CONSTITUTION:The title system is provided with a frequency discriminator 11, a target memory 16, a pulse analyzer 17 for analyzing a pulse repeat number and a tracking guidance controller 9, etc. Also, the controller 9 allows a receiver 2 to receive by a discriminated frequency, and also, allows a mother machine to execute tracking of a radio wave radiation source. Subsequently, in the analyzer 17, a pattern of a pulse arrival time interval in a tracking data memory 10 and data recorded in the memory 16 are brought to pattern matching processing and sent to the controller 9, by which a radiation source having a special pulse interval is discriminated. Accordingly, the guidance tracking can be executed exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an anti-radio wave radiation source guidance device such as an anti-radio wave radiation source missile, which requires tracking guidance for a radio wave radiation source.

[Conventional technology]

FIG. 6 is a block diagram of a conventional radiation source guidance device. In the figure, (1) is an antenna that can form two antenna beams that partially overlap.

(2) is a receiver that processes only a specific frequency band using an external control signal and generates a sum signal and a difference signal of the two beams of antenna (1); (3) is an angle control of antenna (1); (4) is an A/D converter that converts the analog video signal from the receiver (2) into digital; (5) is the A/D converter that converts the signal from
+61 is a gate generator that generates the gate of tracking gate (5), and (7) is the sum signal and difference signal that have passed through tracking gate (5). The angle error detector (8) calculates the angle error from the tracking gate (5), and the tracking gate (5) locks on the target signal that detects whether the amplitude of the signal is above a certain value with respect to the sum signal that has passed through the tracking gate (5). A lock-on detector that determines whether the lock is on or not.

(9) is the angle control of the antenna servo (3), the frequency control of the receiver (2), and the gate A tracking guidance controller that controls the gate position of the generator (6), performs tracking control of the entire guidance device, and simultaneously transmits guidance control information to the mother aircraft. aW is the transmission frequency of the tracking target and the number of transmission pulse repetitions.

This is a tracking data memory that stores initial positions and the like.

FIG. 7 is a diagram explaining the operating principle of the receiver (2) of the conventional radiation source guidance device, where (,) is the frequency spectrum of the transmitted wave from the radio wave radiation source, and (b) is the receiver (2). This is the frequency spectrum of the output. When target 1 is transmitting in band f4 as shown by X in the figure (a), and target 2 is transmitting in band f7 as shown in figure Y, receiver (2) If a control signal is issued to select the frequency f4, the output will be as shown in 2 in FIG. 2(b). Using the principles above.

A conventional radiation source guidance device has a configuration in which a tracking guidance control section (9) specifies a frequency band of a target to be tracked to a receiver (2) and performs frequency tracking.

FIG. 8 is a diagram illustrating the operating principle of the tracking gate (5), gate generator (6), and lock-on determination device (8) of the conventional radiation source guidance device. In the same figure, for example (,)
If there is an input as shown in the figure, the gate generator (6) is as shown in the figure (
When the gate timing shown in b) is generated, the tracking gate (51 output is 3 as shown in the same figure (C)).
This is because there is no output for one of the two pulses.

The lock-on determination device (8) does not make a lock-on determination.

In addition, at the gate timing as shown in FIG.
) makes a lock-on judgment. As described above.

In the conventional anti-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, and the tracking gate (5) If the output matches the received pulse, the lock-on determiner (8) makes a lock-on determination.

FIG. 9 shows the receiver (2), the tracking gate 51. It is an operation flowchart illustrating the overall operation of the conventional radiation source guidance device based on the operating principles of the gate generator (6) and the lock-on determination device (8). The tracking guidance controller (9) selects the transmission frequency band, pulse repetition rate, and general direction of the target to be tracked from the tracking data memory αC in step (to), and first tracks the target to the receiver (2) in step (c). Set the frequency band, the number of pulse repetitions to be tracked by the gate generator (6) in step A, and the approximate direction data of the target to be tracked by the antenna servo (3) in step (2). When the reception frequency and pulse repetition rate from the radio wave radiation source match the data set by the tracking guidance controller (9) and the lock-on determination device (8) issues a lock-on determination in step ■, the data is On the other hand, the angle error detector (7) detects the angle error, and the tracking guidance controller (9) makes a target lock-on determination in step (3) and starts angle tracking using the angle error detection data. Sends a guidance control signal to the mother machine to accurately guide it to radio wave radiation.

[Problem to be solved by the invention]

In the above-mentioned radio wave radiation source guiding device, if the radio wave radiation source transmits by switching multiple transmission frequencies, each time the lock-on determination device (8) switches the transmission frequency of the radio wave radiation source, Since it will come off, tracking guidance,
Since the controller (9) slightly resets the tracking operation from the beginning, the time spent tracking the target radio wave emission source decreases, making it difficult to stably track the radio wave emission source and stably guide the mother aircraft. There was a problem with this.

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

Furthermore, for example, when there are multiple radio wave radiation sources, conventional devices are configured to angularly track only one radio wave radiation source, resulting in the problem that only a single target can be identified.

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

In addition, if the radio wave radiation source transmits signals with special pulse intervals, such as staggered, jittered, multi-PRF ranging, or pulse compression waves using parker codes, the tracking gate (5) will immediately detect the received wave. Although it is possible to generate tracking gate timing similar to that of , it has the disadvantage that tracking cannot be performed.

In addition, in conventional devices, the tracking state is entered through a step of setting parameters such as the reception frequency, pulse repetition rate, and angle, so the Xi radiation source to be tracked changes parameters such as multiple transmission frequencies and pulse widths. In some cases, multiple radio wave radiation sources are used to transmit multiple signals with varying parameters such as frequency and pulse width.

The number of parameter combinations that must be set before entering the tracking state is enormous, and the processing time required to enter the tracking state is often too long.

This invention was made in order to solve the above-mentioned problems, and it is possible to achieve a target memory by continuously writing pulse arrival time and pulse amplitude of a radio wave radiation source in terms of frequency, pulse width, angle, etc. , multiple radio wave radiation sources and multiple transmit frequencies, multiple transmit pulse repetition numbers,
The purpose of this system is to continuously track a radio wave radiation source that emits multiple pulse widths and to stably and accurately guide the mother aircraft to the radio wave radiation source.

In addition, by performing pattern matching processing on the pulse arrival time data recorded in the target memory with the data recorded in the tracking data memory, The purpose is to accurately and quickly identify transmitted pulse trains.

Further, according to the present invention, the number of arrivals of the transmission pulses of the radio wave radiation source is written in the index memory in a form classified by nine frequencies, pulse widths, and angles, so that the pulses are received by the guidance device. The purpose is to quickly grasp the transmission status of radio wave radiation sources and perform subsequent tracking processing more accurately.

[Means to solve the problem]

The radio wave radiation source guidance device according to the present invention has an antenna whose angle is controlled by an antenna servo, and a receiver that generates a sum signal and a difference signal from a received signal from the antenna. It has a frequency discriminator that discriminates frequencies.

It has an amplitude detector, pulse arrival time detector, pulse width detector, and angle error detector after the A/D converter.

It has an address generator that generates a memory address from frequency control data, pulse width data, angle control data, and angle error data, and outputs width data and pulse arrival based on the address generated by the address generator. It has a target memory in which time is written, and a tracking data memory in which the pulse repetition time of the radio wave emission source to be tracked is stored.

Based on the address generated by the address generator above.

It has an index memory in which the number of received waves with a certain amplitude value or more is written, and by checking the pattern matching of the data omitted in the /-get memory and the data stored in the tracking target memory, it is possible to identify the source of microwave radiation. It has a pulse analyzer that analyzes the transmitted pulse pattern, and uses the pulse and repetition number data from the pulse analyzer, the transmitted wave data such as angle error data and pulse width data written in the target memory, and one frequency discriminator. It has a tracking guidance controller that stably guides the base aircraft to the radio wave radiation source using frequency data from the antenna servo, antenna angle data from the antenna servo, and data received from the index memory.

[For production]

In this invention, the tracking guidance controller receives the frequency from the frequency discriminator and is configured to immediately control the receiving frequency band of the receiver and the address of the target memory. Even if a radio source transmits by switching multiple transmission frequencies, by immediately controlling the receiver and target memory address, most of the amplitude and pulse arrival time of the transmitted wave from the radio wave radiation source can be changed continuously. By continuously processing the transmitted wave data of the target memory, it can be written to the target memory.

This enables stable tracking of radio wave radiation sources and guidance of the mother aircraft. In addition, by recording the pulse arrival time for a long time in the target memory, even if the radio wave radiation source switches and transmits multiple pulse repetition numbers, the pulse arrival time can be recorded continuously, making it a stable radio wave radiation source. It becomes possible to track the aircraft and guide the mother aircraft.

In addition, the address generator classifies the pulse width and angle of the radio wave radiation source using the data of the pulse width detector, the data of the angle error detector, and the angle control data of the antenna. Width data can be written to the target memory, so even if multiple radio wave radiation sources exist within the antenna beam, the transmitted wave data from multiple radio wave radiation sources can be stored at the same time, separated by angle. can. Furthermore, for example, even if a transmission wave is transmitted while switching between a plurality of pulse widths, the transmission wave data can be stored in a state classified by 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 that is generated while switching a plurality of pulse widths, and to guide the mother aircraft. In addition, the pulse analyzer performs detection processing on the amplitude data written in the target memory, and compares the pattern of the detected pulse arrival time data with the pulse arrival time data written in the tracking data memory. By doing this, the number of pulse repetitions of the transmitted wave of the radio wave radiation source written in the tracking data memory is compared to determine if it matches or does not match.
Fixed PRF, staggered PRF, jitter PRF, multi PR
It becomes possible to analyze the transmitted pulse pattern of the pulse compression wave using the F, Barker code. Therefore, accurate identification of the radio wave emission source and guidance to the radio wave emission source are possible.

In addition, since the index memory stores the arrival circuits of the transmission pulses of the radio wave radiation source classified by frequency, pulse width, and angle, when entering the tracking signal processing, the arrival circuit of the transmission pulse of the radio wave radiation source is By starting processing from the radiation source, it is possible to detect cases where a radio wave radiation source transmits data with varying parameters such as multiple transmission frequencies and pulse widths, or when multiple radio wave radiation sources transmit data with multiple transmission frequencies and parameters such as pulse width Even in cases where radio wave emission sources are transmitted with different values, it is possible to efficiently determine the priority order for entering tracking processing, and at the same time, it is possible to more accurately determine the priority order for starting the tracking process. This makes it possible to analyze various data.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
)~141. +71. The QOI is exactly the same as that of the conventional device. The ring is a frequency discriminator that discriminates the frequency of the received signal that has entered the antenna (11), and outputs the discriminated frequency information as a digital signal.The α force is the amplitude of the sum signal output from the A/D converter (4). Amplitude detector to detect.

(131 is a pulse arrival time detector that detects the pulse arrival time for the sum signal data, and 0 is a pulse width detector that detects the pulse width for the sum signal data.

Oe is a target memory for storing the data of the amplitude detector 03 and the pulse arrival time detector 03, and has a capacity sufficient to record the transmitted wave data of the radio wave radiation source.

Qυ is an index memory in which the number of received waves having a certain amplitude value or more is written in the output data of the amplitude detector a2;
Q5) has an angular error of 9 when writing data to the target memory Qb) and index memory +213.
Generates a write address that allows you to classify the write position by frequency, pulse width, etc., and when reading, generates an address that allows you to freely read only the necessary data from the classified data above. It is an address generator.

aη is a pulse analyzer that analyzes information such as the number of pulse repetitions based on the pulse arrival time data that is abundant in the target memory Q61, and (9) is the amplitude data, frequency data, angle data, and frequency that are praised in the target memory Q61. and frequency data from the discriminator αD.

and antenna angle data from antenna servo (3).

The target radio wave radiation source is tracked using the pulse repetition number data from the pulse analyzer αη, and a tracking guidance controller that guides the mother machine performs tracking control of the entire device.

FIG. 2 is a diagram explaining the configuration of the pulse analyzer αη,
The α mark is an AND creation circuit that takes the AND of the pulse arrival time data from the target memory (161) and the reference data from the tracking data memory αα. A counting counter that counts the number of circuits that have failed, ■ outputs a pulse repetition number detection flag when the value counted by counting counter 09 is a constant value 1, e.g. It is a comparator that

FIG. 3 is a diagram showing the internal configuration of the index memory circle, where ■ indicates a constant value 9 instructed by the tracking guidance controller (9), for example, a value greater than half the maximum amplitude enters from the amplitude detector 0. A comparator that generates 1 and outputs 0 otherwise, (c) is a RAM (random access memory) that stores the number of arrivals of received waves with the above-mentioned fixed amplitude value or more, @ is a comparator ■Output and RAMc! This is an adder that performs addition of 3+ outputs.

In the anti-radiation source guidance device configured as above,
The frequency discriminator αD discriminates the frequency of the received wave received by the antenna (1), and the tracking guidance controller (9) selects the receiving frequency so that the receiver (2) receives the frequency at the discriminated frequency. By performing control, it becomes possible to constantly receive transmitted wave data from the radio wave radiation source.

Further, the sum signal and difference signal from the receiver (2) are each converted into digital data by an A/D converter (4), and the amplitude is determined by the A/D converter (4).

Pulse arrival time, pulse width, and angular error are detected.

Among the above data, the amplitude data and pulse arrival time data are written to the target memory (161) with sufficient capacity and then used as information for tracking and guidance, so the pulse repetition of the received wave Even if the number changes irregularly, it is stored in the target memory αQK as an irregular pulse arrival time corresponding to the pulse repetition number, and all the received pulse information can be recorded.

Further, the address generator α9 of the target memory Q61 generates reception frequency data for instructing the receiver (2) from the tracking guidance controller (9), angle control data for instructing the antenna servo (3), and angle error detector (7). Since the angular error data from the pulse width detector Q4+ and the pulse width data from the pulse width detector Q4+ are used as addresses in the target memory 061, a plurality of radio wave data can be stored in an efficiently classified form. FIG. 4 shows the target memory αe
This is a diagram explaining how two radio wave radiation sources are classified and included in the memo I.
Written in X, Y above between 72 and different angles DI, D
2. Different transmission frequencies fl, f2. This shows that even if the pulses are transmitted with different pulse widths Wl and W2, they can be clearly identified in the memory space as long as they are not input at the same time.

In addition, the address generator α9 is the target memory (161
Since time-series data can be written continuously in the target memory ae, even if multiple radio wave radiation sources transmit a mixture of multiple transmission frequencies and multiple pulse widths, the data will not be stored in the target memory ae. The radio wave data is stored continuously in an organized form, and there is no overhead time for tracking the radio wave data of the radio wave emission source.

The pulse analyzer αη first records the tracking data memo IJQO.
All the pulse arrival time interval patterns stored in I and the data stored in the target memory Qe include radio wave radiation sources that are classified into specific received frequency, 9% constant pulse width, and specific angle. The pulse arrival time is compared with the pulse arrival time, and the number of times where the logical product becomes 1 is counted by a counting counter α9. The count value of the count counter 09) is a constant value, for example 1.
If the number is equal to or greater than 80% of the number of comparisons performed for reference, then the tracking data memory (pulse arrival time pattern quoted from ItN and the pulse arrival time pattern of the radio wave radiation source stored in the target memory) It is determined that there is a high correlation with the target memo I, and a pulse repetition number detection flag is sent to the tracking guidance controller (9).
J (161) is the pulse arrival time data of the received wave, (b) is the pulse arrival time pattern data stored in the tracking data, (C) is the AND creation circuit (161).
This is the output of 8). In this case, the number of comparisons for -times reference is 5, and the count value of the counting counter t19) is 4, so the comparator (4) sends a pulse repetition number detection flag to the tracking guidance controller (9). .

This method of determining the pulse repetition rate makes it possible to identify radio wave radiation sources with special pulse intervals such as staggered, jittered, multi-PRF ranging, Barker code pulse compression, and the like.

Due to the operation of the pulse analyzer α as described above, the υ tracking guidance controller (9) receives nine frequency data and angle data.

In addition to the pulse width data, it is possible to more accurately identify the number of pulse repetitions, which makes it possible to more accurately guide the base aircraft to the II wave radiation source.

Also, in the index memory C211, the internal R
AM (231) stores the number of past received pulses classified by two frequencies, pulse widths, and angles.

When the amplitude of the received wave is newly detected by the amplitude detector α2,
First, the comparator (3) compares the value 2 specified by the tracking guidance controller (9) with, for example, half the maximum amplitude, and outputs 1 if the value is greater than that value.

At this time, RAMC! From 3 onwards, the same frequency as the new received wave is generated by the address controlled by the address generator α9.
The number of past received pulses with pulse width and angle is read out, and after being added to the output value 1 of comparator (1) by adder @, it is written to the same address again. The tracking guidance controller (9) is the RA in the index memo IJ 2υ.
Received wave data of any frequency, pulse width, and angle can be read from M (n).

Index memory 0υ seen from tracking guidance controller (9)
The configuration of the memory map is similar to that of the target memory αG.

In the index memory Qυ having the above function, for example, the radio wave radiation source has multiple transmission frequencies.

9 even if the data is sent with different pulse widths, etc.
Since the number of incoming and received pulses is stored classified by frequency and pulse width, tracking processing such as pulse repetition number analysis can be performed with priority given to the pulses that have been received the most within the RAM (c) area. This makes it possible to efficiently and quickly identify radio wave radiation sources. Also.

By performing processing such as pulse analysis on pulses with a large number of received waves, more accurate identification processing is possible.

By the way, in the above explanation, the antenna angle data is processed in 2 steps.
For example, multiple antenna beams are limited to one direction, for example, only up and down, but in the case of multiple beams, angles in the vertical and horizontal directions are processed using a total of 4 antenna beams (up, down, left and right). Needless to say, similar tracking guidance control can be performed.

Also, the above index memory c! In the explanation of the operation of No. 11, the case where the received wave is a single pulse is given, but an example is also applied to the case of a continuous wave by performing processing such as converting the continuous time into the number of pulses.

It goes without saying that it can perform efficient processing.

〔Effect of the invention〕

As explained above, this invention mainly uses a receiving frequency control in a receiver and a target memory that can efficiently classify recorded data, so that a radio wave radiation source discontinuously changes its transmitting frequency, etc. In this case, continuous data recording can be performed, stable guidance and tracking can be performed, and multiple data from multiple radio wave radiation sources can be handled.

Furthermore, in this invention, by comparing the pulse arrival time of the radio wave radiation source recorded in the target memory and the pulse arrival time pattern stored in the tracking data memory in advance and examining the correlation, t+! This has the effect of making it possible to identify radio wave radiation sources with special pulse intervals.

Further, according to the present invention, by using the INTEX memory, it is possible to efficiently determine the priority order of the radio wave emission sources for which tracking processing is to be performed, so that the wave emission sources can be tracked more quickly and accurately.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional diagram showing an embodiment of the present invention, Fig. 2 is a detailed block diagram of a pulse analyzer showing a 1Mψ model of the invention, and Fig. 3 is a diagram showing an embodiment of the invention. The figures shown are a detailed block diagram of the index memory, FIG. 4 is a diagram for explaining the operation of an embodiment of the present invention, a diagram for explaining the target memory, and FIG. 5 is a diagram for explaining the embodiment of the present invention. A diagram explaining the operation of a pulse analyzer, FIG. 6 is a diagram showing a conventional radio wave radiation source guiding device, and FIGS. 7, 8, and 9 are diagrams explaining the operation of a conventional radio wave radiation source guiding device. This is a diagram. In the figure, (υ is the antenna, (2) is the receiver, (3)
is the antenna servo, (4) is the A/D converter, (5) is the tracking gate, 161 is the gate generator, (7) is the angle error detector, (8) is the lock-on judge, and (9) is the Tracking guidance controller 1 song is tracking data memory, αυ is frequency discriminator, Q
2 is the amplitude detector, αJ is the pulse arrival time detector, α4
1 is the pulse width detector, 051 is the address generator, α61
is the target memo IJ, l? ) is a pulse analyzer, 081
is an AND creation circuit. u9 is a counting counter, ■ is a comparator, α211 is an index memory, @ is an adder, and (2) is a RAM. Note that in FIG. 9, the same or equivalent parts are designated by the same reference numerals.

Claims (1)

[Claims] An antenna that can form two partially overlapping antenna beams, an antenna servo that sets the angle of the antenna, and an antenna that receives signals from the antenna and generates a sum signal and a difference signal of the two beams. A receiver that can switch the received frequency band using a control signal from the receiver, a frequency discriminator that discriminates the frequency of the received signal that has entered the antenna and outputs the discriminated frequency information as a digital signal, and an analog signal from the receiver. An A/D converter that converts the signal into a digital signal, an angular error detector that calculates the angular error from the digitized sum signal and difference signal, and an A/D
An amplitude detector that detects the amplitude of the sum signal data from the converter, a pulse arrival time detector that detects the pulse arrival time of the sum signal data, and a pulse width detector that detects the pulse width of the sum signal data. target memory for writing the amplitude detector output and pulse arrival time detector output, index memory for writing the number of receptions of data greater than a certain amplitude value for the amplitude detector output, and when writing data to the index memory and target memory. , an address generator that makes it possible to classify write positions based on angular error, frequency, pulse width, etc., for target memory data, for tracking data, and for pulse repetition number data written in the tracking data memory. Tracking guidance control for radio wave radiation sources is performed on data from a pulse analyzer, antenna servo, target memory, index memory, frequency discriminator, and pulse analyzer that can analyze the number of pulse repetitions by performing pattern matching processing. What is claimed is: 1. A radio wave radiation source guidance device characterized by comprising a tracking guidance controller for performing tracking, and a tracking target memory for storing radio wave specifications etc. generated by a target to be tracked.