JP2621203B2 - 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 for tracking only a signal having a specific pulse repetition number 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 the difference between the sum signal and the difference signal passing through the tracking gate (5) in the direction of the radio wave radiation source with respect to the antenna (1). Angle error detector that calculates the indicated angle error,
(8) Lock-on determination for determining whether or not the tracking gate (5) is locked on the signal of the target which has detected whether the amplitude of the signal with respect to the sum signal passed through the tracking gate (5) is equal to or larger than a predetermined value. And (9) an angle control of an antenna servo (3) and a frequency control of a receiver (2) based on lock-on information from a lock-on determiner (8) and angle error information from an angle error detector (7). And gate generator (6)
A tracking guidance controller that controls the gate position of the vehicle and controls the tracking of the entire guidance system and simultaneously transmits the guidance control information to the mother machine. (10) stores the transmission frequency, transmission pulse repetition number, initial position, etc. of the tracking target This is a tracking data memory to be kept.

6A and 6B are diagrams for explaining the operation principle of the receiver (2) of the conventional radiation source guiding apparatus, wherein (a) shows the frequency spectrum of the transmission wave of the radio wave radiation source, and (b) shows the receiver (2). ) The frequency spectrum of the output. As shown by X in the same figure, target 1 is transmitting at the frequency of band f4,
As shown in FIG. 5Y, when the target 2 is transmitting in band f7, when a control signal is output to the receiver (2) so as to select the frequency of band f4, the output is as shown by Z in FIG. become. 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 number of the target to be tracked, If the output of the tracking gate (5) coincides with the received pulse, the lock-on decision unit (8) makes a lock-on decision.

FIG. 8 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.

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

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.

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

[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. It has a frequency discriminator that discriminates the frequency of the received wave received by the A / D converter. It has an amplitude detector, a pulse arrival time detector, a pulse width detector, and an 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. It has a tracking data memory that stores reference data such as the complex co-reduction function of the transmission wave of the target to be tracked. Has a pulse analyzer that identifies the transmitted wave of the radio wave radiation source by performing correlation processing between the reference data of the target and the received wave data of the target memory. The pulse repetition number data from the pulse analyzer and the target memory are stored in the target memory. Tracking guidance control that guides the mother machine stably to the radio wave radiation source based on the written transmission data such as angle error data and pulse width data, frequency data from the frequency discriminator, and antenna angle data from the antenna servo. Holding a bowl.

[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. . Also, 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.

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

〔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)
, Amplitude data, frequency data, angle data, frequency data from frequency discriminator (11), antenna angle data from antenna servo (3), and pulse repetition number data from pulse analyzer (17) Thus, the tracking guidance controller which performs tracking of the target radio wave radiation source and guides the mother machine, performs tracking control of the entire apparatus.

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

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

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

Among the above data, the amplitude data and 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 pulse 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) is 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 from the angle error detector (7). Since the pulse width data from the width 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 classified form.
Even if data is written to X and Y in the memory space and transmitted at different angles D1 and D2, different transmission frequencies F1 and F2, and different pulse widths W1 and W2, if the respective pulses are not simultaneously input in time, This indicates that it can be clearly identified in the memory space.

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.

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

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

FIG. 4 is a diagram for explaining the correlation calculation in the pulse analyzer (17). When an FFT operation is performed by the FFT operation circuit (18) on the pulse-compressed waveform by the linear FM modulation in the target memory (16) as shown in FIG. 7A, the output becomes as shown in FIG. The same figure (c) shows one memory (1
0), the output of FIG. 9B is multiplied by the output of FIG. 8C by the multiplier (19), and the output becomes as shown in FIG. It becomes the frequency spectrum of the pulse wave with the same phase. Figure (d)
By performing an IFFT on the output from the IFFT operation circuit (20),
A pulse-like compressed waveform shown in FIG.

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

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

〔The invention's effect〕

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

Further, according to the present invention, a pulse analyzer capable of discriminating a pulse by performing a correlation processing operation on a special modulation wave such as a pulse compression is provided, so that accurate tracking can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one 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) multiplier, (20) I
The FFT operation circuit, (21) is a comparator. 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, and tracking; A tracking data memory in which the frequency spectrum of the transmission wave of the radio wave radiation source to be stored is stored as reference data, and a frequency spectrum is obtained from the data stored in the target memory, and the frequency spectrum is stored in the tracking data memory. A pulse analyzer that identifies a radio wave radiation source having a specific modulated wave from among a plurality of radio wave radiation sources by performing a correlation process, and the receiver receives the frequency discriminated by the frequency discriminator and receives the received frequency. A reception frequency that indicates the reception frequency band of the receiver to receive A means for outputting data, and outputting antenna angle control data for instructing the antenna servo, comprising a tracking guidance controller having the reception frequency data and the antenna angle control data as addresses of the address generator, Further, the tracking guidance controller has means for reading out an angular error of the antenna with respect to the radio wave radiation source identified by the pulse analyzer from the target memory and generating a guidance control signal for mother unit guidance. Radio wave radiation source guidance device.