JP2615902B2 - 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. 14 is a block diagram of a conventional radio wave radiation source guidance device. In the figure, (1) is an antenna capable of receiving radio waves from a plurality of radio wave radiation sources generating pulses and forming two partially overlapped antenna beams;
(2) is a receiver that processes only a specific frequency band by an external control signal and generates a sum signal and a difference signal of two beams of the antenna (1), and (3) is an angle control of the antenna (1). (4) is an A / D converter that converts an analog video signal from the receiver (2) to digital, and (5) is a specific signal for the signal from the A / D converter (4). A tracking gate for tracking only a signal having a pulse repetition number (also referred to as a pulse repetition frequency and indicating the number of pulses per unit time); (6) a gate generator for generating the gate of the tracking gate (5); ) Is an angle error detector for calculating an angle error indicating a difference between 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), and (8) is a tracking gate (5) Of the sum signal passed through Detecting whether more than a predetermined value, the lock-on determination unit determines whether the tracking gate to a target signal (5) is locked on, (9)
Is the angle control of the antenna servo (3), the frequency control of the receiver (2) and the gate generator based on the lock-on information from the lock-on determiner (8) and the angle error information from the angle error detector (7). A tracking guidance controller that performs the gate position control of (6) and performs the tracking control of the entire guidance device, and simultaneously transmits the guidance control information to the mother machine. (10) is the transmission frequency of the tracking target, the number of transmission pulse repetitions, and the initial value. This is a tracking data memory that stores a position and the like.

FIGS. 15 (a) and 15 (b) are diagrams for explaining the operation principle of the receiver (2) of the conventional radio wave radiation source guiding device, where (a) is the frequency spectrum of the transmission wave of the radio wave radiation source and (b) is the receiver ( 2) Output frequency spectrum. When the target 1 is transmitting at the frequency of the band f4 as indicated by X in FIG. 9A and the target 2 is transmitting at the band f7 as indicated by Y in FIG. When a control signal is issued so as to select the frequency of the band f4, the output becomes as shown by Z in FIG. Utilizing the above principle, the conventional radio wave radiation source guidance device 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 frequency tracking. I have.

FIG. 16 is a diagram for explaining the operation principle of the tracking gate (5), the gate generator (6) and the lock-on judging device (8) of the conventional radio wave radiation source guidance device. In the figure,
For example, when there is an input as shown in (a) and the gate generator (6) generates a gate timing as shown in FIG. As shown in c), since only one of the three pulses is output, 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 radio wave radiation source guidance device, the tracking guidance 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 determiner (8) makes a lock-on determination.

FIG. 17 shows the operation of the entire conventional radio wave radiation source guidance device based on the operating principle of the receiver (2), tracking gate (5), gate generator (6), and lock-on decision unit (8). It is an operation flowchart to be described. In step (28), the tracking guidance controller (9) selects the transmission frequency band, pulse repetition number, and approximate direction of the target to be tracked from the tracking data memory (10). ) Frequency band to track, step (3
In step (0), the pulse repetition number to be tracked by the gate generator (6) is set, and in step (31), the approximate direction data of the target to be tracked by the antenna servo (3) is set. When 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 determination unit (8) issues a lock-on determination in step (25), the step (33) is performed. In step (34), the angle error is detected by the angle error detector (7). The tracking guidance controller (9) makes a target lock-on determination in step (34), and uses the angle error detection data. At the same time as entering angle tracking, 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) is released every time the transmission frequency of the radio wave radiation source is switched, the tracking guidance controller (9) performs the tracking operation again from the beginning. There is a problem that the time for tracking the radiation source is reduced, and it is difficult to track the radio wave radiation source stably and to guide the stable base unit.

Further, for example, when the radio wave radiation source transmits a plurality of frequencies simultaneously, the receiver (2) can process only a single frequency, so that there is a problem that only one of the plurality of frequencies can be tracked. Was.

Further, for example, when the radio wave radiation source transmits a plurality of transmission pulse repetition numbers by switching, there is a problem that the tracking guidance performance is deteriorated for the same reason as described 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 there is a problem 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 and the like, the gate width of the tracking gate (5) is used 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 signal is fixed.

Also, in the conventional device, since the tracking state is entered through the steps of setting parameters such as the reception frequency, the pulse repetition number, and the angle, the radio wave radiation source to be tracked needs to transmit a plurality of parameters such as transmission frequency and pulse width. Change it,
In the case of transmission, or in the case where multiple radio wave radiation sources change parameters such as multiple transmission frequencies and pulse widths and transmit, the combination of parameters set before entering the tracking state The number is enormous, and there is a problem that it takes too much processing time to enter the tracking state.

For example, in the conventional apparatus, when detecting the pulse repetition number, a method is employed in which a tracking gate is generated using the pulse repetition number data written in the tracking data memory (10) to identify the pulse repetition number. Therefore, there is an overhead time such as positioning of a tracking gate when identifying the pulse repetition number of the radio wave radiation source, so that there is a problem that it takes too much time to identify the pulse repetition number.

Also, if the radio wave radiation source is, for example, stagger, jitter,
When transmitting with a special pulse interval, such as PRF ranging and pulse compression by Barker code,
There is a problem that the tracking gate (5) cannot immediately generate the same tracking gate timing as that of the received wave, and cannot track.

In addition, when the radio wave radiation source has transmitted with a special pulse interval such as a linear FM modulation, a pulse compression wave by Barker code, etc., the tracking gate (5) immediately follows the same tracking gate timing as the reception wave. There was a problem that tracking could not be performed because of the inability to generate tracking.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a pulse repetition time (hereinafter, referred to as a pulse arrival time) and a pulse amplitude of a radio wave radiation source are stored in a target memory for each frequency band. The pulse width,
By writing continuously according to the angle of the radio radiation source with respect to the antenna, simultaneous transmission of multiple radio radiation sources and radio emission sources emitting multiple transmission frequencies, multiple transmission pulse repetitions, and multiple pulse widths is possible. The purpose of the present invention is to perform continuous tracking, and to guide the mother machine to the radio wave radiation source stably and accurately.

Further, the present invention writes the number of arrivals of transmission pulses of a radio wave radiation source into an index memory in a form classified by pulse width and angle, thereby quickly grasping the transmission status of the radio wave radiation source received by the guidance device. Therefore, it is an object of the present invention to perform the subsequent tracking processing more accurately.

In addition, the present invention performs a pattern matching process of the pulse arrival time data written in the target memory with the pulse repetition number data written in the tracking data memory, so that the pulse repetition number and the radio repetition number of the radio wave radiation source can be determined. An object is to accurately and quickly identify a regular pulse train.

Further, the present invention detects the pulse repetition number of a radio wave radiation source by performing a pulse arrival time histogram process, and can accurately detect transmitted waves having special pulse intervals such as stagger, jitter, and multi-PRF ranging. The purpose is to perform a proper identification.

In addition, the present invention performs a correlation processing operation on the target memory data to accurately identify even a special pulse repetition number pattern such as a linear FM modulation, a pulse compression wave using a Barker code, or the like. The purpose is to:

Also, the present invention provides a method for processing target memory data.
An object of the present invention is to accurately identify a pulse repetition number of a radio wave radiation source by performing an FFT operation.

[Means for solving 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, receives a received signal from the antenna, and outputs a sum signal of the received signal.
It has a receiver that outputs the difference signal independently for each frequency, and an amplitude detector, a pulse arrival time detector, and an A / D converter placed for each frequency band output of the receiver. It has a pulse width detector and an angle error detector, and has an address generator that generates a memory write address from pulse width data, angle control data and angle error data,
It has a target memory for writing the amplitude data and the pulse arrival time based on the address generated by the address generator, and has a tracking data memory for storing the pulse repetition time of the radio wave radiation source to be tracked. It has an index memory that writes the number of received waves with a certain amplitude or more based on the address generated by the analyzer, and has a pulse analyzer that identifies the pulse repetition number for the target memory data. Stable radio wave source based on pulse repetition rate data, transmitted wave data such as angular error data and pulse width data written in target memory, frequency data from frequency discriminator, and antenna angle data from antenna servo And a tracking guidance controller for guiding the mother machine.

In addition, the pulse analyzer employs a method of performing pattern matching with the pulse repetition number data written in the tracking data memory, or a method of analyzing the pulse repetition number by performing a pulse arrival time histogram process. Alternatively, a method of identifying the transmission pulse pattern of the radio wave radiation source by performing a correlation processing operation, or a method of analyzing the number of pulse repetitions by performing an FFT operation process may be employed.

(Operation)

In the present invention, since the reception signal is configured to be simultaneously processed for each frequency band, the radio wave radiation source can switch between a plurality of transmission frequencies and transmit.
Even when the radio wave source simultaneously transmits multiple transmission frequencies, it is possible to continuously write the amplitude and pulse arrival time data of the transmission wave from the radio wave source to the target memory installed in each frequency band. By continuously processing the received wave data in the target memory, stable tracking of the radio wave radiation source and guidance of the mother machine can be performed.

Also, by recording the long pulse arrival time in the target memory, even when the radio wave radiation source transmits multiple pulse repetition rates, the pulse arrival time can be recorded continuously. Tracking and guidance of the mother machine become possible.

In addition, the address generator classifies the pulse width and angle of the radio wave radiation source based on the data of the pulse width detector, the data of the angle error detector, and the angle control data of the antenna. Since pulse width data can be written to the target memory, for example, even if multiple radio wave radiation sources are present in the beam of the antenna, the transmission wave data from many radio wave radiation sources are simultaneously divided by angle. Can be memorized. 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-described reasons, it is possible to continuously track and guide the mother machine to a plurality of radio wave radiation sources and to a radio wave radiation source generated while switching a plurality of pulse widths.

The index memory for each frequency band contains the arrival time of the transmission pulse from the radio wave radiation source, the pulse width,
When the tracking signal processing is started, the processing is started from the radio wave radiation source with the highest number of arrivals, so that the radio wave radiation source can have multiple parameters such as transmission frequency and pulse width. Priority for efficiently entering tracking processing even when transmission is performed with different parameters or when multiple radio wave radiation sources transmit with different parameters such as multiple transmission frequencies and pulse widths By performing the processing in order from the radio wave radiation source with the largest number of detections, more accurate data analysis can be performed.

In the pulse analyzer, the pulse arrival time data written in the target memory is subjected to pattern matching processing with the pulse repetition number data written in the tracking data memory, so that the pulse repetition number and the radio repetition rate of the radio wave radiation source are determined. Regular pulse trains can be identified accurately and quickly.

In another type of pulse analyzer, the pulse arrival time data written in the target memory is subjected to histogram processing to detect the number of pulse repetitions of the radio radiation source, and to detect stagger, jitter, multi-PRF ranging, etc. Accurate identification can be performed even for a transmission wave having a special pulse interval.

In addition, another type of pulse analyzer performs correlation processing on target memory data, which can be applied to special pulse repetition rate patterns such as linear FM modulation and pulse compression waves using Barker codes. ,
Accurate identification can be performed.

Further, in another type of pulse analyzer, the number of pulse repetitions of the radio wave radiation source can be accurately identified by performing the FFT operation on the target memory data.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
(1), (3), (4), (7) and (10) are exactly the same as the above-mentioned conventional apparatus. (27) is a receiver capable of independently processing a received signal input to the antenna (1) for each frequency band and outputting a received video, and shows four examples of frequency bands. (11) an amplitude detector for detecting the amplitude of the sum signal output of the A / D converter (4) for each frequency band, and (12) a pulse arrival for detecting a pulse arrival time for the sum signal data. A time detector, (13) stores a pulse width detector for detecting a pulse width of the sum signal data, and (15) stores data of the amplitude detector (11) and a pulse arrival time detector (12). It is a target memory and has sufficient capacity to store the transmission wave data of the radio wave radiation source.

(35) is an index memory for writing the number of received waves having a certain amplitude value or more in the output data of the detector (12), and (14) is an angle memory for writing data to the target memory (15). Generates a write address so that the write position can be classified based on errors, pulse widths, etc., and generates an address from which the required data can be freely read out of the above classified data when reading. Address generator. (9) is based on the amplitude data and angle data written in the target memory (15), the antenna angle data from the antenna servo (3) and the pulse arrival number data from the index memory (35).
It is a tracking guidance controller that tracks the target radio wave radiation source and guides the mother machine, and performs tracking control control of the entire device.

FIG. 2 is a diagram showing the internal configuration of the index memory (35), and (21) shows a constant value designated by the tracking guidance controller (9), for example, a value equal to or more than half the maximum amplitude,
A comparator which outputs 1 when it enters from the amplitude detector (11) and outputs 0 otherwise, and a comparator (37) is a RAM (random access random access memory) in which the number of arrivals of the reception wave having a certain amplitude value or more is written. Memory), (36) is a comparator (21)
This is an adder that adds the output and the RAM (37) output.

FIG. 3 is a diagram showing the internal configuration of a pulse analyzer (17) that detects the reference pulse repetition time for the target memory data and analyzes the pulse repetition number based on the reference pulse repetition time. (18) a reference PRI detector that detects a difference between two pulse arrival times from pulse arrival time data recorded in the target memory (15) and outputs a reference pulse repetition time; (6)
Is a gate generator that generates gate signals at the same pulse interval using the reference pulse repetition time from the reference PRI detector (18). (19) is the pulse arrival time data and gate generator from the target memory (15). An AND circuit that outputs the total number of AND operations with the gate signal from (6), and (20) indicates the number of ANDs generated by the AND circuit (19) is 1 Counting counter to count, (2
Reference numeral 1) denotes a comparator which outputs 1 to the tracking guidance controller (9) when the count value of the counter (20) detects a constant value, for example, 80% or more of the pulse repetition number of the total number of AND operations.

FIG. 4 is a diagram showing an internal configuration of a pulse analyzer (17) of a type that analyzes the number of pulse repetitions by using reference pulse repetition time data written in a tracking data memory. A gate generator for generating gate signals at the same pulse interval using the reference pulse repetition time from the tracking data memory (10), (19) a pulse arrival time data from the target memory (15) and the gate generator (6) ) And an AND circuit for outputting the total number of AND operations with the gate signal from (), and (20) counts the number of ANDs generated by the AND circuit (19) being 1 The count counter (21) outputs to the tracking guidance controller (9) 1 when the count value of the count counter (20) detects a constant value, for example, 80% or more of the pulse repetition number of the total number of AND operations. comparator A.

FIG. 5 is a diagram showing the internal configuration of a pulse analyzer (17) that performs pattern matching processing with the pulse repetition number data written in the tracking data memory.
(19) is a logic for outputting the total number of AND operations of the pulse arrival time data written in the target memory (15) and the pulse repetition number data written in the tracking data memory (10). A product creation circuit, (20) is a count counter that counts the number of times the logical product has become 1 in the logical product creation circuit (19), and (21) is a constant value counted by the count counter (20). , For example, 80
This is a comparator that outputs 1 when the value is not less than%.

FIG. 6 is a diagram showing the internal configuration of a pulse analyzer (17) that analyzes the number of pulse repetitions by performing a histogram process of the pulse arrival time. This is a comparator that outputs 1 when it is within a certain level range. For example, if the comparison value is 10 and the level range is ± 20%, 1 is output only when the input value is 8 or more and 12 or less. (20) is the comparator (22)
Counter for counting the number of times 1 is output in (23)
Is a logical product creation circuit for outputting a logical product of inputs.

FIG. 7 shows a pulse analyzer (1) that identifies a transmission pulse pattern of a radio wave radiation source by performing a correlation processing operation.
7) is a diagram showing the internal configuration of (7), (24) is an FFT arithmetic circuit that performs FFT signal processing on pulse arrival time data and amplitude data of the target memory (15), and (25) is a frequency axis Multiplier that performs multiplication, (26) is an IFFT arithmetic circuit that performs an IFFT operation on the output of the multiplier (25), (21) is an IFFT arithmetic circuit (26) that is written to the tracking data memory (10). This is a comparator that outputs 1 when a value equal to or greater than a certain threshold value is output.

FIG. 8 is a diagram showing the internal configuration of a pulse analyzer (17) of a type that analyzes the number of pulse repetitions by performing an FFT operation, and (24) is recorded in a target memory (15). Sampling is performed at a frequency sufficiently higher than the pulse repetition number of the radio emission source for the pulse arrival time.
This is an FFT operation circuit that performs an FFT operation, for example, performs a 16-point FFT at a sampling frequency of 16 kHz and performs frequency bins # 1 to # 4.
Output up to. (22) is a comparator for performing pattern comparison on the output of the FFT operation circuit. For example, when a value within ± 20% of the comparison value is input, 1 is output.
(23) is a logical product creation circuit that performs a logical product operation on the output of the comparator (22).

In the radiation source guidance device configured as described above, the reception wave received by the antenna (1) is received by the receiver (2).
7) outputs independently for each frequency, and in the subsequent stage, the received data can be recorded in the target memory (15) for each frequency and then processed, so that the transmitted wave data from the radio wave radiation source is always received. It is possible to continue.

The sum signal and difference signal of the receiver (27) 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 pulse width data and pulse arrival time data are written to the target memory (15) with sufficient capacity and then used as tracking and guidance information. Even if the pulse repetition rate of the wave changes irregularly, the target memory (15)
And all the received pulse information can be recorded.

Further, the address generator (14) of the target memory (15) is provided with the angle control data for instructing the antenna servo (3), the angle error data from the angle error detector (7), and the pulse width detector (13). Since the pulse width data is used as the address of the target memory (15), a plurality of radio wave data can be efficiently written in a classified form. FIG. 9 is a diagram for explaining the manner in which four radio wave radiation sources are written in the target memory (15) in a classified form. The target memory (15) viewed from the tracking guidance controller (9) The memory space of FIG. In the embodiment of the present invention, the target memory (15) corresponding to the frequency band has four configurations, but the four target memories (15) are adjacent to each other when viewed from the tracking guidance controller (9). Can be regarded as being located in the address area of In the figure, four radio wave radiation sources are X,
It is written in Y, Z, W, and shows that even if transmitted at different angles D1, D2, different transmission frequencies f1, f2, f3, f4 and different pulse widths W1, W2, it is clearly identified in the memory space. I have.

In addition, the address generator (14) can continuously write time-series data to the target memory (15), so that multiple radio wave radiation sources transmit multiple transmission frequencies and multiple pulse widths. , Even if they are transmitted together, the radio wave data will be stored continuously in an organized form in the target memory (15), and the radio wave data from the radio wave radiation source will be tracked. No overhead time.

In the index memory (35), the internal RA
The number of past received pulses is stored in M (37) in a form classified by pulse width and angle. When the amplitude of the received wave is newly detected by the amplitude detector (11), the amplitude is firstly compared by the comparator (21) with a value specified by the tracking guidance controller (9), for example, a half of the maximum amplitude. , Is greater than or equal to that value, 1 is output. At this time, the number of past received pulses having the same pulse width and angle as the new received wave is read from the RAM (37) by the address controlled by the address generator (14). ) Is added to the same address again by the adder (36). The tracking guidance controller (9) is capable of reading received wave data of any frequency, pulse width and angle from the RAM (37) in the index memory (9).
The configuration of the memory map of the index memory (35) is similar to the configuration of the memory map of the target memory (16). In the index memory (35) having the above functions, for example, even when the radio wave radiation source transmits with changing a plurality of transmission frequencies, pulse widths, etc., from the viewpoint of the tracking guidance controller (9), Since the number of arriving pulses is stored in a form categorized by frequency and pulse width, tracking processing such as pulse repetition rate analysis should be performed with priority given to pulses with the highest number of receptions in the RAM (37) area. Thus, the radio wave radiation source can be efficiently and quickly identified. Further, by performing processing such as pulse analysis from a pulse having a large number of received waves, more accurate identification processing can be performed.

In the pulse analyzer (17) of FIG. 3 which analyzes the number of pulse repetitions by detecting the reference pulse repetition time, the reference PRI detector (18) first receives a pulse from the target memory (15). The arrival time difference between two pulses is detected from the time data, and a reference pulse repetition time is output. The gate generator (6) uses the reference pulse repetition time from the reference PRI detector (18) to generate gate signals at the same pulse interval. If the pulse arrival time data of the target memory (15) is received at the above-mentioned reference pulse repetition time, the logical product generation circuit (19) generates a large one of the logical product pulses. Output the part with 1. The counting counter (20) counts the number of the logical product 1, and if the number is a constant value,
For example, if it is 80% or more of the total number of AND operations, the comparator (21) outputs 1 to notify the tracking guidance controller (9) that the pulse repetition number has been detected. In the tracking data memory (10), the radio wave radiation source corresponding to the reference pulse repetition time data from the reference PRI detector (18) is recorded, and the tracking guidance controller (9) stores the tracking data memory (10). The type of the radio wave radiation source detected through this can be identified.

FIG. 10 is a diagram for explaining the operation of the pulse analyzer (17). For the target memory data shown in FIG.
The reference PRI detector (18) detects a reference pulse repetition time of 1 μs, and the gate generator (6) generates a gate signal at 1 μs intervals as shown in FIG. In this case, the output of the logical product creation circuit (19) is as shown in FIG. 3 (c), and the count value of the counter (20) is 4. Since the total number of AND operations is 5, the comparator (21) outputs 1 if it is 80% or more of the total number of AND operations, and outputs 1 if the tracking guidance controller ( Inform 9) that the pulse repetition number has been detected.

In the pulse analyzer (17) based on the method of analyzing the number of pulse repetitions by using the reference pulse repetition time data written in the tracking data memory (10) shown in FIG. According to the instruction from 9), the tracking data memory (10) outputs the pulse repetition interval of the radio wave radiation source to be tracked. The gate generator (6) uses the reference pulse repetition time from the tracking data memory (10) to generate gate signals at the same pulse interval. If the pulse arrival time data of the target memory (15) is received at the above-mentioned reference pulse repetition time, the logical product generation circuit (19) generates a large one of the logical product pulses. Output the part with 1. The counting counter (20) counts the number of the logical product 1, and if the number is a fixed value, for example, 80% of the total number of times the logical product is obtained.
If so, the comparator (21) outputs 1 to notify the tracking guidance controller (9) that the pulse repetition number has been detected.

FIG. 10 is a diagram for explaining the operation of the pulse analyzer (17). The tracking data memory (10) outputs a reference pulse repetition time of 1 μs with respect to the target memory data of FIG. (A), and the gate generator (6) outputs 1 μs intervals as shown in FIG. Generate a gate signal. In this case, the output of the AND circuit (19) is as shown in FIG.
Becomes Since the total number of AND operations is 5, the comparator (21) outputs 1 if the output is 1 if it is 80% or more of the total number of AND operations, and outputs 1 to the tracking guidance controller. Inform (9) that the pulse repetition number has been detected.

In the pulse analyzer (17) of the type that performs pattern matching with the pulse repetition number data written in the tracking data memory (10) shown in FIG. 5, the tracking data is first stored in the tracking data memory (10). The patterns of all the pulse arrival time intervals and the pulse arrival time data written in the target memory (15) are compared, and the number of which the logical product becomes 1 is counted by the counter (20). If the count value of the count counter (20) is a constant value, for example, a value that is 80% or more of the number of times of AND operation, then the pattern of the pulse repetition time written in the tracking data memory (10) and the target memory It has been determined that there is a high correlation with the pulse arrival time pattern of the radio wave radiation source described in (15), and the comparator (21) outputs 1 and sends the radio wave radiation source to the tracking guidance controller (9). That the pattern of the pulse repetition number is identified.

FIG. 10 is a diagram for explaining the operation of the pulse analyzer (17). (A) is the pulse arrival time data of the radio wave radiation source written in the target memory (15), (b) is the pulse repetition time pattern data written in the tracking data memory (10), and (c) is the logic. This is the output of the product creation circuit (19). In this case, the number of AND operations is five and the count value of the counter (20) is four, so the comparator (21) outputs 1 and the tracking guidance controller (9) outputs the pulse of the radio wave radiation source. Signals that a repeat count pattern has been identified.

In the pulse analyzer (17) which analyzes the pulse repetition number by performing the pulse arrival time histogram processing shown in FIG. 6, four comparators are used for the pulse arrival time of the target memory (15). (22)
When the input value is within a certain level range centered on each comparison value set in the tracking data memory (10), for example, a range of ± 20%, 1 is output. When the above comparison is repeated for all the pulse arrival time data written in the target memory (15), each count value of the count counter (20) becomes ± before and after each comparison value of the comparator (22). A histogram is formed with the data value falling within 20% as the domain.

In the tracking data memory (10), the target to be tracked is specified by the tracking guidance controller (9), and the counting counter (20)
The histogram value in each domain of the target to be tracked is counted with respect to the comparison input of the comparator (22) at the subsequent stage. The comparator (22) at the subsequent stage of the count counter (20) stores the data value of the tracking data memory (10),
A comparison is made with the data value of the count counter (20). For example, if the data value of the count counter (20) is within ± 20% of the data value of the tracking data memory (10), 1 is output.

In the above operation, if the histogram pattern output from the tracking data memory (10) and the histogram pattern output from the count counter (20) match within a range of ± 20%, the logical product generation circuit (23) Since the comparator (22) at the subsequent stage of all the count counters (20) outputs 1, it outputs 1 and the tracking guidance controller (9) confirms that the transmission pulse pattern of the radio wave radiation source can be identified. Inform.

FIG. 11 is a diagram for explaining the operation of the pulse analyzer (17). 0.5 μs, 1 μs, respectively in the target memory (15)
When a pulse repetition pattern of a burst stagger having a pulse repetition interval of 2 μs is recorded as shown in FIG. 7A, when histogram processing is performed by the pulse analyzer (17), it is shown in FIG. A histogram output as shown in FIG. When this histogram output is compared with the histogram pattern of the tracking data memory (10) as shown in FIG. 3 (c), the output of the comparator (22) at the subsequent stage of the counter (20) becomes 1 The pulse repetition pattern of the radio wave radiation source designated by the tracking guidance controller (9) is identified.

In the pulse analyzer of the type which identifies the transmission pulse pattern of the radio wave radiation source by performing the correlation processing operation shown in FIG. 7, for example, the radio wave radiation source transmits a pulse compression wave modulated by a linear FM modulation method. First, the FFT operation circuit (24) performs Fourier operation processing on the amplitude data of the received wave on the time axis written in the target memory (15),
Convert to amplitude data on frequency. On the other hand, the tracking data memory (10) receives an instruction from the tracking guidance controller (9), and outputs, as reference data, a complex conjugate function of a frequency spectrum of a transmission wave of the radio wave radiation source to be tracked,
The multiplier (25) performs multiplication with the amplitude data on the frequency. Multiplication on the frequency has the same meaning as convolution on the time axis, and if the reference data matches the complex conjugate data of the frequency spectrum of the received wave, the output of the multiplier (25) is IFFT If the data is converted into data on the time axis by the arithmetic circuit (26), it is output as a compressed pulse.

When the radio wave radiation source is transmitting with, for example, an amplitude before compression 1 and an amplitude after compression 10, the comparator (21)
When is set as the threshold value, if the output of the IFFT operation circuit (26) is 9 or more, 1 is output to notify the tracking guidance controller (9) that a pulse has been detected.

FIG. 12 is a diagram for explaining the operation of the pulse analyzer (17). When an FFT operation is performed by the FFT operation circuit (24) on the pulse compression wave modulated by the linear FM modulation method in the target memory (15) as shown in FIG. Become like 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. As shown in FIG. 9C, the frequency spectrum of the pulse wave having the same phase is obtained. When the IFFT operation is performed on the output of FIG. 4D by the IFFT operation circuit (26), the compressed waveform shown in FIG. 5E is obtained.

A pulse analyzer (17) that analyzes the number of pulse repetitions by performing the FFT operation shown in FIG.
First, the FFT operation circuit (24) uses the target memory (1
If the pulse arrival time data of 5) is sampled at a frequency sufficiently higher than the pulse repetition rate of the radio wave radiation source, for example, the pulse repetition rate of the radio wave radiation source is about 2 kHz, it is sampled at about 16 kHz and then the FFT operation is performed, for example, 16 points Performs FFT operation. FF
At the output of each frequency bin of the T calculator (24), amplitude data is output only to the frequency bins corresponding to an integral multiple of the radio wave radiation source, so that the comparator (22) at the subsequent stage compares with the comparison data of each frequency bin. As a result, the transmission pulse pattern of the radio wave radiation source can be subjected to pattern matching processing on the frequency axis. The comparison value of the comparator (22) is to be output by the comparison pattern generator (26) in response to the instruction of the tracking data memory (10).
If the output patterns of the FT operation unit (24) match, the logical product generation circuit (23) outputs 1 and the tracking guidance controller (9)
That the pulse repetition number has been identified.

FIG. 13 is a diagram for explaining the operation of the pulse analyzer (17). The pulse arrival time data having a pulse width of 1 μs and a pulse repetition rate of 2 kHz is sampled at 16 kHz, and a 16-point FFT is performed.
The example of the output amplitude of each frequency bin at the time of performing arithmetic processing is shown. Assuming that the FFT operation circuit (24) in the pulse analyzer (17) shown in FIG. 7 outputs, for example, frequency bins # 1 to # 4, the comparison pattern generator (26)
If, for example, 0, 0.95, 0, 0.9 is added to the comparison value of the comparator (22) in which the output of 4 is input, for example, in the order of # 1 to # 4, the comparator will be within ± 20% of the comparison value, for example. If it is assumed that 1 is output when a value is input, all comparators (22) output 1 and the output of the logical product generation circuit (23) becomes 1, indicating that the pulse has been identified. To the container (9).

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

In the above description, the number of frequency bands of the receiver (27) is four. However, as the number of frequency bands is increased, the frequency that can be discriminated is increased, and it is needless to say that the radio wave radiation source can be more accurately identified. Nor.

In the description of the operation of the index memory (35), the case where the received wave is a single pulse is described. However, even when the received wave is a continuous wave, for example, processing such as converting continuous time into the number of pulses is performed. It goes without saying that efficient processing can be performed by performing the above.

In the above description, the pulse analyzer (17) that analyzes the number of pulse repetitions by performing the histogram processing of the pulse arrival time has a configuration in which four comparators (22) are arranged in parallel. It goes without saying that as the number of comparators (22) arranged in parallel is increased, the pulse repetition number that can be discriminated increases as the number increases, and the pulse repetition number of the radio wave radiation source can be identified more accurately.

In the above description, the calculation processing in the frequency domain is performed in the pulse analyzer (17) that identifies the transmission pulse pattern of the radio wave radiation source by the correlation processing calculation, but the correlation processing such as convolution integration in the time domain is performed. Needless to say, even if the processing operation is performed, the transmission pulse pattern of the radio wave radiation source can be identified.

In the above description, four comparators (22) are arranged in parallel in the pulse analyzer (17) that analyzes the number of pulse repetitions by performing the FFT operation process. It goes without saying that as the number of the arranged comparators (22) is increased, the frequency bins after the FFT processing are increased, and the pulse repetition number of the radio wave radiation source can be identified more accurately.

〔The invention's effect〕

As described above, the present invention mainly uses a receiver capable of simultaneously processing a plurality of frequency bands and a target memory capable of efficiently classifying recorded data, so that a plurality of radio wave radiation sources can be transmitted at different transmission frequencies and pulse repetition rates. Etc. are received in a discontinuous manner,
Even when a plurality of transmission frequencies are transmitted simultaneously, continuous data processing can be performed, and there is an effect that stable guidance tracking can be performed.

Further, according to the present invention, since the priority order of the radio wave radiation sources to be tracked can be efficiently determined by using the index memory, the radio wave radiation sources can be more quickly and accurately tracked.

Further, according to the present invention, the pulse arrival time data written in the target memory is subjected to pattern matching processing with the pulse repetition number data written in the tracking data memory, so that the pulse repetition number and irregular There is an effect that accurate pulse trains can be accurately and quickly identified.

Further, in the present invention, the pulse repetition number of the radio wave radiation source is detected by performing the histogram processing of the pulse arrival time, and accurate for transmission waves having special pulse intervals such as stagger, jitter, and multi-PRF ranging. There is an effect that identification can be performed.

Further, according to the present invention, by performing a correlation processing operation on the target memory data, it is possible to accurately identify even a special pulse repetition number pattern such as a linear FM modulation, a pulse compression wave using a Barker code, or the like. effective.

Further, according to the present invention, there is an effect that the pulse repetition number of the radio wave radiation source can be accurately identified by performing the FFT operation on the target memory data.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a detailed block diagram of an index memory of the present invention, FIG.
FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 8 are detailed block diagrams of the pulse analyzer of the present invention, FIG. , Fig. 12 and Fig. 13 are diagrams for explaining the operation of the pulse analyzer, Fig. 14 is a block diagram of a conventional radio wave radiation source guidance device, Figs. It is a figure explaining operation of a 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 an amplitude detector, (12) is a pulse arrival time detector, (13) is a pulse width detector, (14) is an address generator, (15) is a target memory, (17) is a pulse analyzer, (18) Is the reference PRI detection, (19) and (23) are AND circuits, (20) is a counter, (21) and (22) are comparators, and (24) is an FFT.
Arithmetic circuit, (25) is a multiplier, (26) is an IFFT arithmetic circuit,
(27) is a receiver, (35) is an index memory, (36)
Is an adder, and (37) is a RAM. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

Claims (4)

(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 capable of outputting a sum signal and a difference signal of two beams for each frequency band, and a sum of respective frequency bands provided for each frequency band of the receiver and output from the receiver. A plurality of A / D converters for converting a signal and a difference signal into digital signals, and an angular error indicating a difference in a direction of a radio wave radiation source with respect to the antenna by the sum signal and the difference signal digitized by the A / D converter. And a plurality of amplitude detectors each detecting the amplitude, pulse repetition time, and pulse width of the sum signal from the digitized sum signal, and a pulse. The return time detector and the pulse width detector, and the storage locations of the amplitude detector output and the pulse repetition time detector output for each pulse width and angle error detected by the pulse width detector and the angle error detector, respectively. A plurality of target memories to be classified and stored, and the number of times of reception of a reception wave having a predetermined amplitude value or more among the outputs of the amplitude detector are classified into storage locations for each pulse width and angle error in the same manner as in the target memory. And a plurality of address generators for generating addresses for writing and reading data to and from the target memory and the index memory, respectively, and pulse repetition time data of a radio wave radiation source to be tracked. The obtained tracking data memory and the pulse arrival time data stored in the target memory are stored in the tracking data memory. A pulse analyzer that compares the pulse repetition time data stored in the data memory and identifies a radio wave radiation source having a specific pulse repetition number from a plurality of radio wave radiation sources based on the number of times that the data is matched; The stored reception frequency data of the received wave is read, a plurality of radio wave radiation sources are selected in descending order of the reception frequency data, and the angle error of the antenna with respect to the radio wave radiation source identified by the pulse analyzer is read from the target memory. And a tracking guidance controller for generating signals for guiding the mother machine. 2. An antenna for forming two antenna beams and receiving radio waves from a plurality of radio wave radiation sources, an antenna servo for adjusting the direction of the beam of the antenna, and receiving a signal from the antenna. A receiver capable of outputting a sum signal and a difference signal of two beams for each frequency band, and a sum of respective frequency bands provided for each frequency band of the receiver and output from the receiver. A plurality of A / D converters for converting a signal and a difference signal into digital signals, and an angular error indicating a difference in a direction of a radio wave radiation source with respect to the antenna by the sum signal and the difference signal digitized by the A / D converter. And a plurality of amplitude detectors each detecting the amplitude, pulse repetition time, and pulse width of the sum signal from the digitized sum signal, and a pulse. The return time detector and the pulse width detector, and the storage locations of the amplitude detector output and the pulse repetition time detector output for each pulse width and angle error detected by the pulse width detector and the angle error detector, respectively. A plurality of target memories to be classified and stored, and the number of times of reception of a reception wave having a predetermined amplitude value or more among the outputs of the amplitude detector are classified into storage locations for each pulse width and angle error in the same manner as in the target memory. A plurality of index memories, a plurality of address generators for generating addresses for writing and reading data to and from the target memory and the index memory, respectively, and a histogram pattern of pulse repetition times of radio wave radiation sources to be tracked. At the time of pulse repetition stored in the tracking data memory in which The data is subjected to histogram processing to generate a histogram pattern of the pulse repetition time, and the histogram pattern is compared with the histogram pattern stored in the tracking data memory to match the histogram pattern from the plurality of radio wave radiation sources. A pulse analyzer that identifies a radio wave radiation source, reads out the reception frequency data of the received wave stored in the index memory, selects a plurality of radio radiation sources in descending order of the reception frequency data, and is identified by the pulse analyzer. And a tracking guidance controller which reads out the angle error of the antenna with respect to the radio wave radiation source from the target memory and uses it as a signal for guiding the mother machine. 3. An antenna for forming 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 receiving a signal from the antenna. A receiver capable of outputting a sum signal and a difference signal of two beams for each frequency band, and a sum of respective frequency bands provided for each frequency band of the receiver and output from the receiver. A plurality of A / D converters for converting a signal and a difference signal into digital signals, and an angular error indicating a difference in a direction of a radio wave radiation source with respect to the antenna by the sum signal and the difference signal digitized by the A / D converter. And a plurality of amplitude detectors each detecting the amplitude, pulse repetition time, and pulse width of the sum signal from the digitized sum signal, and a pulse. The return time detector and the pulse width detector, and the storage locations of the amplitude detector output and the pulse repetition time detector output for each pulse width and angle error detected by the pulse width detector and the angle error detector, respectively. A plurality of target memories to be classified and stored, and the number of times of reception of a reception wave having a predetermined amplitude value or more among the outputs of the amplitude detector are classified into storage locations for each pulse width and angle error in the same manner as in the target memory. And a plurality of address generators for generating addresses for writing and reading data to and from the target memory and the index memory, respectively, and a frequency spectrum of a transmission wave of a radio radiation source to be tracked. A tracking data memory stored as reference data, and a sum signal stored in the target memory A modulated wave having a spectrum that is correlated with the reference data is obtained from a plurality of radio wave radiation sources by obtaining a frequency spectrum from the time variation of the amplitude and correlating the frequency spectrum with the reference data stored in the tracking data memory. A pulse analyzer for identifying the radio wave radiation source having the data, reading out the reception frequency data of the reception wave stored in the index memory, selecting a plurality of radio wave radiation sources in descending order of the reception frequency data, and identifying by the pulse analyzer And a tracking guidance controller for reading out the obtained angle error of the antenna with respect to the radio wave radiation source from the target memory and using it as a signal for guiding the mother machine. 4. An antenna for forming two antenna beams to receive radio waves from a plurality of radio wave radiation sources, an antenna servo for adjusting the direction of the beam of the antenna, and receiving a signal from the antenna. A receiver capable of outputting a sum signal and a difference signal of two beams for each frequency band, and a sum of respective frequency bands provided for each frequency band of the receiver and output from the receiver. A plurality of A / D converters for converting a signal and a difference signal into digital signals, and an angular error indicating a difference in a direction of a radio wave radiation source with respect to the antenna by the sum signal and the difference signal digitized by the A / D converter. And a plurality of amplitude detectors each detecting the amplitude, pulse repetition time, and pulse width of the sum signal from the digitized sum signal, and a pulse. The return time detector and the pulse width detector, and the storage locations of the amplitude detector output and the pulse repetition time detector output for each pulse width and angle error detected by the pulse width detector and the angle error detector, respectively. A plurality of target memories to be classified and stored, and the number of times of reception of a reception wave having a predetermined amplitude value or more among the outputs of the amplitude detector are classified into storage locations for each pulse width and angle error in the same manner as in the target memory. A plurality of index memories for writing and reading data to and from the target memory and the index memory, and a plurality of address generators for generating addresses for reading and storing the data, and corresponding to each frequency bin of the radio wave radiation source to be tracked. The pulse arrival time data of the target memory and the tracking data memory in which the amplitude data is stored are stored in the radio wave radiation source. After sampling at a frequency higher than the number of repetitions, the amplitude data of each frequency bin is created by performing an FFT operation, and the amplitude data is stored in the above-mentioned tracking data memory. A pulse analyzer for identifying a radio wave radiation source having a specific pulse repetition number whose amplitude data matches by comparing the amplitude data with a plurality of radio wave radiation sources; and receiving a received wave stored in the index memory. The frequency data is read out, a plurality of radio wave radiation sources are selected in descending order of the reception frequency data, and the angle error of the antenna with respect to the radio wave radiation source identified by the pulse analyzer is read out from the target memory, and a signal for guiding the mother unit is read. A radio wave radiation source guidance device comprising: a tracking guidance controller;