JP2621207B2 - Radio wave radiation source guidance device - Google Patents

Description

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

[Conventional technology]

FIG. 5 is a configuration diagram of a conventional radiation source guiding apparatus. In the figure, (1) is an antenna capable of receiving radio waves from a plurality of radio wave radiation sources that generate pulses and forming two partially overlapping antenna beams, and (2) an external control signal. A receiver that processes only a specific frequency band and generates a sum signal and a difference signal of two beams of the antenna (1), (3) is an antenna servo that controls the angle of the antenna (1), and (4) is A / D converter for converting analog video signal from receiver (2) to digital,
(5) a tracking gate that tracks only a signal having a specific pulse repetition number (also referred to as a pulse repetition frequency and indicating the number of pulses per unit time) with respect to the signal from the A / D converter (4). , (6) is a gate generator for generating the gate of the tracking gate (5), and (7) is a difference in the direction of the radio wave radiation source with respect to the antenna (1) from the sum signal and the difference signal passing through the tracking gate (5). (8) is an angle error detector that calculates an angle error that indicates whether the amplitude of the sum signal passed through the tracking gate (5) is equal to or greater than a predetermined value. A lock-on determiner for determining whether or not lock-on is performed, (9) an antenna servo (3) based on lock-on information from the lock-on determiner (8) and angle error information from the angle error detector (7)
A tracking guidance controller that performs angle control of the receiver, frequency control of the receiver (2), and gate position control of the gate generator (6), performs tracking control of the entire guidance device, and simultaneously transmits guidance control information to the mother device. Reference numeral 10) denotes a tracking data memory for storing a transmission frequency, a transmission pulse repetition number, an initial position, and the like of a tracking target.

FIG. 6 is a diagram for explaining the operation principle of the receiver (2) of the conventional radiation source guiding apparatus, wherein (a) shows the spectrum of the transmission wave of the radio wave radiation source, and (b) shows the output of the receiver (2). Is the frequency spectrum. 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 the control signal is output to the receiver (2) 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 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 the frequency tracking.

FIG. 7 shows a tracking gate (5) of a conventional radiation source guiding apparatus.
FIG. 4 is a diagram for explaining the operation principle of a gate generator (6) and a lock-on determiner (8). For example, when there is an input as shown in (a) and the gate generator (6) generates a gate timing as shown in FIG. Since only one of the three pulses is output as shown in (c), the lock-on determiner (8) does not make a lock-on determination. At the gate timing as shown in FIG. 3D, all three of the three pulses have outputs, and the lock-on determiner (8) makes a lock-on determination. As described above, in the conventional radiation source guidance apparatus, the tracking guidance controller (9) instructs the gate generator (6) to generate a tracking gate signal corresponding to the pulse repetition of the target to be tracked, and the tracking gate. (5) If the output coincides with the received pulse, the lock-on determiner (8) makes a lock-on determination.

FIG. 8 illustrates the operation of the entire conventional 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). FIG. In step (21), the tracking guidance controller (9) reads the transmission frequency band, the pulse repetition number,
Select an approximate direction, and in step (22), first set the receiver (2)
Frequency band to be tracked, pulse repetition number to be tracked to gate generator (6) in step (23), step (24)
Sets the approximate direction data of the target to be tracked by the antenna servo (3). 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), the lock-on determination unit (8) performs step (25).
In step (26), an angle error is detected by the angle error detector (7) in step (26), and the tracking guidance controller (9) performs target lock-on determination in step (27). At the same time as entering angle tracking using the angle error detection data, a guidance control signal for accurately guiding the mother device to radio wave emission is output to the mother device.

[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 lost 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, so that the target radio wave emission There is a problem that the time for tracking the source is reduced, and it is difficult to track the radio wave radiation source stably and to guide the stable base unit.

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

For example, when there are a plurality of radio wave radiation sources, the conventional device has a configuration in which only one radio wave radiation source is angle-tracked, so that 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, the gate width of the tracking gate (5) is fixed in the conventional device. There is a problem that only tracking is performed for a transmission wave having a single pulse width because the tracking is performed while keeping the tracking.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned 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. By writing continuously according to the width and the angle of the radio wave radiation source with respect to the antenna, the radio wave radiation source that emits multiple radio wave radiation sources, multiple transmission frequencies, multiple transmission pulse repetitions, and multiple pulse widths can be used. The purpose is to continuously track and guide the mother machine to the radio wave radiation source stably and accurately.

Another object of the present invention is to accurately identify a pulse repetition frequency of a radio wave radiation source by performing FFT processing on a target memory.

[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, has a receiver that inputs a received signal from the antenna, and outputs a sum signal and a difference signal of the received signal. Has a frequency discriminator that discriminates the frequency of the received wave received by the A / D converter, and has an amplitude detector, pulse arrival time detector, pulse width detector, and angle error detector after the A / D converter. A target memory for writing amplitude data and pulse arrival time based on the address generated by the address generator, having an address generator for generating a memory write address from the address, pulse width data, angle control data and angle error data. Have a pulse analyzer that performs FFT processing on the target memory data and identifies the pulse repetition number of the radio radiation source, and wants to track It has a tracking data memory that stores data such as the pulse repetition number of the wave radiation source. The pulse repetition number data from the pulse analyzer, and the transmission wave data such as angle error data and pulse width data written in the target memory, It has a tracking guidance controller that guides the mother machine stably to the radio wave radiation source based on the frequency data from the frequency discriminator and the antenna angle data from the antenna servo.

[Action]

According to the present 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 if the transmission frequency is switched, the receiver control and the address control of the target memory are performed immediately, so that the amplitude of the transmitted wave from the radio wave radiation source and most of the pulse arrival time can be continuously transmitted to the target memory. , And by continuously processing the transmission wave data of the target memory, stable tracking of the radio wave radiation source and guidance of the mother machine can be performed. In addition, by recording the long pulse arrival time in the target memory, the pulse arrival time can be recorded continuously even when the radio wave radiation source transmits with switching the multiple pulse repetition rates. Tracking and guidance of the mother machine can be performed.

The address generator uses the pulse width detector data, the angle error detector data, and the antenna angle control data to classify the pulse width and angle of the radio wave radiation source, 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, transmission wave data from a large number of radio wave radiation sources can be simultaneously stored in a state of being divided for each angle. . Further, for example, even if the transmission wave is transmitted while switching a plurality of pulse widths, the transmission wave data can be stored in a state classified by the pulse width. For the above reasons, it is possible to track a plurality of radio wave radiation sources, to continuously track a radio wave radiation source generated while switching a plurality of pulse widths, and to guide the mother machine.

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

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
(1) to (4), (7) and (10) are exactly the same as the above-mentioned conventional apparatus. (11) is a frequency discriminator for discriminating the frequency of the received signal input to the antenna (1), and outputs the discriminated frequency information as a digital signal. (12) is A / D
An amplitude detector for detecting the amplitude of the sum signal output of the converter (4), (13) a pulse arrival time detector for detecting a pulse arrival time for the sum signal data, and (14) a pulse arrival time detector for the sum signal data Pulse width detector to detect pulse width, (16)
Is the above amplitude detector (12), pulse arrival time detector (13)
Is a target memory for storing the data of the radio wave, and has a sufficient capacity to record the transmission wave data of the radio wave radiation source. In (15), when writing data to the target memory (16), a write address is generated so that the write position can be classified by angle error, frequency, pulse width, etc., and when reading, the above classified data is generated. This is an address generator that generates an address from which only necessary data can be freely read from data.

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

FIG. 2 is a diagram showing the internal configuration of the pulse analyzer (17). (18) shows that the pulse arrival time recorded in the target memory (16) is sufficiently higher than the pulse repetition number of the radio wave radiation source. This is an FFT operation circuit that performs sampling at a frequency and performs an FFT operation, for example, performs a 16-point FFT at a sampling frequency of 16 KHz and outputs frequency bins # 1 to # 4. (19) is a comparator that performs pattern comparison on the output of the FFT operation circuit.
When the value within% is input, 1 is output. (20) is a logical product creation circuit that performs a logical product operation on the output of the comparator (19).

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

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

Among the above data, the amplitude data and pulse arrival time data are written to the target memory (16) with sufficient capacity and then used as tracking and guidance information. Even if the repetition number changes irregularly, the received pulse information can be recorded as an irregular pulse arrival time corresponding to the pulse repetition number in the target memory (16).

In addition, the address generator (1
5), reception frequency data instructed from the tracking guidance controller (9) to the receiver (2), angle control data instructed to the antenna servo (3), and angle error data and pulse width from the angle error detector (7). Since the pulse width data from the detector (14) is used as an address of the target memory (16), a plurality of radio wave data can be efficiently written in a classified form. FIG. 3 is a diagram illustrating a state in which two radio wave radiation sources are written in the target memory (16) in a separated form, and the two radio wave radiation sources are stored in X and Y in the memory space. Even if written and transmitted at different angles D1, D2, different transmission frequencies f1, f2, and different pulse widths W1, W2, if each pulse is not input simultaneously in time, it must be clearly identifiable in memory space. Is shown.

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

In the pulse analyzer (17), the FFT operation circuit (1
8) The FFT operation 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, at about 16 KHz if the pulse repetition rate of the radio radiation source is about 2 KHz For example, a 16-point FFT operation is performed. Since amplitude data is output only to frequency bins corresponding to an integral multiple of the pulse repetition number of the radio wave radiation source, the frequency bin output from the FFT calculator (18) is
By performing comparison with the comparison data of each frequency bin by the comparator (19) at the subsequent stage, 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 (19) is output by the comparison pattern generator (21) in response to the instruction of the tracking guidance controller (9), and the comparison pattern and the output pattern of the FFT operation unit (18) are compared. If so, the logical product creation circuit (20) outputs 1 to notify the tracking guidance controller (9) that the pulse repetition number has been identified.

FIG. 4 is a diagram for explaining the operation of the above pulse analyzer (17). The pulse arrival time data having a pulse width of 1 μsec 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 a process is shown. Assuming that the FFT operation circuit (18) in the pulse analyzer (17) shown in FIG. 2 outputs, for example, frequency bins # 1 to # 4, the comparison pattern generator (21) 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 ± 20% of the comparison value, for example, the output value is 1
, All comparators (19) are 1
Is output, and the output of the logical product creation circuit (20) becomes 1, and the fact that the pulse has been identified is notified to the tracking guidance controller (9).

By the way, in the above description, the processing of the antenna angle data is limited to two directions by, for example, only one direction in the upper and lower directions. It goes without saying that the same tracking guidance control can be performed even if the processing of the direction and the angle in the left-right direction is performed.

In the above description, the pulse analyzer (17) uses an example of the data of the pulse repetition number without staggering.
It goes without saying that the transmission pattern having a special pulse repetition number such as jitter can be identified by performing pattern matching processing on the frequency axis.

〔The invention's effect〕

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

Further, in the present invention, a pulse analyzer capable of accurately discriminating a pulse repetition number pattern such as stagger and jitter by performing a pattern matching process on a frequency axis after performing an FFT signal process on a target memory. Therefore, there is an effect that accurate and stable tracking can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing an embodiment of the present invention, and is a detailed block diagram of a pulse analyzer. FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention. FIG. 5 is a diagram for explaining the operation of the pulse analyzer, FIG. 5 is a diagram showing a conventional radio wave radiation source guidance device, and FIGS. FIG. 4 is a diagram for explaining the operation of the radio wave radiation source guidance device. In the figure, (1) is an antenna, (2) is a receiver,
(3) Antenna servo, (4) A / D converter, (5)
Is a tracking gate, (6) is a gate generator, (7) is an angle error detector, (8) is a lock-on determination device, (9) is a tracking guidance controller, (10) is a tracking data memory, and (11). Is a frequency discriminator, (12) is an amplitude detector, (13) is a pulse arrival time detector, (14) is a pulse width detector, (15) is an address generator, (16) target memory, and (17) is Pulse analyzer, (18) FFT operation circuit, (19) comparator, (2
0) is a logical product generation circuit, and (21) is a comparison pattern generator. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

Claims (1)

(57) [Claims] An antenna for forming two antenna beams to receive radio waves from a plurality of radio wave radiation sources, an antenna servo for adjusting a direction of a beam of the antenna, and receiving a signal from the antenna. A receiver that outputs a sum signal and a difference signal of two beams and that can switch a reception frequency band, a frequency discriminator that discriminates a frequency of a reception signal received by the antenna, and a sum signal from the receiver And an A / D converter for converting the difference signal into a digital signal,
An angle error detector that calculates an angle error indicating a difference between the direction of the radio wave radiation source with respect to the antenna based on the digitized sum signal and the difference signal, and an amplitude, pulse repetition time, and pulse of the sum signal from the digitized sum signal An amplitude detector, a pulse repetition time detector, and a pulse width detector, each detecting a width, the amplitude detector output and the pulse repetition time detector output, the frequency discriminator, the pulse width detector,
A target memory for classifying and storing storage locations for each frequency, pulse width, and angle error detected by the angle error detector; an address generator for generating an address for writing and reading data to and from the target memory; The tracking data memory in which the amplitude data corresponding to each frequency bin of the power radiation source is stored, and the pulse repetition time data of the target memory is sampled at a frequency higher than the pulse repetition frequency of the radio radiation source, and then the FFT operation is performed. By generating amplitude data of each frequency bin and comparing the amplitude data with the amplitude data of each frequency bin stored in the tracking data memory, a specific pulse having the same amplitude data from a plurality of radio wave radiation sources A pulse analyzer that identifies radio wave radiation sources with a repetition rate, and a frequency discriminator described above Means for receiving a separated frequency, outputting reception frequency data indicating a reception frequency band of the receiver so that the receiver receives the frequency, and outputting antenna angle control data indicating the antenna servo. A tracking guidance controller having the reception frequency data and the antenna angle control data as the address of the address generator, further comprising: a tracking guidance controller for the radio wave radiation source identified by the pulse analyzer. An apparatus for guiding a radio wave radiation source, comprising: means for reading an angle error of an antenna from the target memory to generate a guidance control signal for guiding a mother machine.