JPS61159176A - Pulse detecting device - Google Patents

Abstract

PURPOSE:To detect a desired pulse by classifying respective elements of arrival pulse items and deciding a single pulse train of coincident classified elements, and comparing an identification table containing specific pulse items which are set previously with detected pulse train items. CONSTITUTION:Arrival pulse signals 1 are classified by carrier frequencies through a frequency classifying circuit 2. Classification results are supplied to a pulse width classifying circuit 3 from an output line 2a and input pulse signals stored in the memory in a circuit 2 are supplied to the circuit 3 from an output line 3a and classified by pulse width. Classification results are supplied from an output line 3a to a time interval classifying circuit 4 and input pulse signals stored in the memory of the circuit 3 are supplied from an output line 3b to the circuit 4, which performs classification by time intervals. The classification results of the circuits 3 and 4 are applied to a comparator 4 from the output lines 3a and 4a and compared with the identification table 6 which contains frequencies, pulse width, and time intervals of dangerous target pulses such as a missible; when a coincidence is obtained, an output 7 for warning is outputted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention analyzes pulse signals in a complex radio wave environment by using a frequency classification circuit, a pulse subclassification circuit, and a time interval (Time O) classification circuit.
f Imteval; hereinafter referred to as TOI. ) This relates to a pulse detection device that detects a target pulse train by classifying it in detail using a classification circuit and comparing it with a preset identification table.

[Conventional technology]

A conventional device of this type is shown in FIG. In the figure, (I) ri arriving pulse signal, (2a) (2b
) (2c) are bandpass filters that pass only the pulse signals of specific carrier waves among the arriving pulse signals (1), and (4a) (4b) (4c) are bandpass filters (2
a) (2b) PRI (Pulse Repetition) that allows only pulse trains having specific repetition periods to pass among the carrier wave pulse signals that have passed through (2c).
(7) is the output of this detection device.

Next, the operation will be explained. The incoming pulse signal (13 is a bandpass filter (2) that passes a specific frequency signal, respectively.
a) (2b) The frequency is classified into three different carrier frequency bands by (2c). Then, if the frequency-classified pulse signals have a specified repetition period, they pass through the PRI filters (4m), (4b), and (4c) to obtain a specific carrier frequency. If even one dangerous pulse signal from a missile or the like having a specified repetition period is detected, an output (7) for IF alarm etc. is obtained.

[Problem that the invention seeks to solve]

Since the conventional detection device is configured as described above, regarding multiple pulse trains whose frequencies and TOI are close to each other,
There are drawbacks such as inability to detect each target pulse as a single pulse train and poor detection accuracy because the margin widths of the bandpass filter and PRI filter are fixed.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the received pulses are classified by a frequency classification circuit, a TOI classification circuit, and a pulse width classification circuit.
It is highly accurate that it is possible to classify and detect pulse trains with close frequencies and TOIs by pulse width, and to detect the target pulse as a single pulse train by comparing the results with an identification table set in advance for the target pulse specifications. The purpose is to obtain a pulse detection device.

[Means for solving problems]

The pulse detection device according to the present invention classifies each element of incoming pulse specifications in detail, determines a pulse train that matches a series of classification results as a single pulse train, and further divides each element into predetermined pulse specifications that are set in advance. A desired pulse is detected by comparing the detection pulse train specifications with an identification table indicating the source.

[For production]

In the classification circuit according to the present invention, the classification accuracy is improved by narrowing the classification margin width as the classification pulse is updated. Also, the pulse specifications.

By arranging classification circuits for three elements in series,
A highly accurate single pulse train is detected in order to three-dimensionally compare pulse specifications.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is an incoming pulse signal, (2) is a frequency classification circuit that frequency-classifies the pulse carrier wave, and (3) is a pulse width classification that classifies the pulse width of the pulse signal frequency-classified by the frequency classification circuit (2). The circuit (4) is a TOI classification circuit for TOI classification of the pulse signal classified by the frequency classification circuit (2) and the pulse width classification circuit (3), (5)
is the frequency circuit (2), pulse width classification circuit (3) and T
A comparator (7) compares the pulse signal classified by the OI classification circuit (4) with a dangerous target signal preset in the identification table (6) and outputs an output when they match.
This is the output of 5).

Next, the operation will be explained. In FIG. 1, an incoming pulse signal (1) is subjected to frequency classification of the carrier wave of the pulse signal by a frequency classification circuit (2). This frequency classification classifies the input pulses P1 to P, which have frequencies F and ~F, into, for example, three frequency classes, and if they cannot be classified into three classes, they cannot be separated, but this classification If the output line (2) of the frequency classification circuit (2) is completed,
The classification result is obtained in a). When the above classification is completed, the classification result is given to the pulse width classification circuit (3) from the output line G!, and the input pulse signal stored in the memory in the frequency classification circuit (2) is transferred to the output line G! b> to a pulse width classification circuit (3), and pulse width classification is performed in this pulse width classification circuit (3). This pulse width classification circuit (3) also has a pulse width value P%Vt ~PWN
For example, input pulses P1 to pw having a pulse width are classified into three pulse width classes, and if they cannot be classified into three classes, they cannot be classified. However, if this classification is possible, the pulse width classification circuit The classification result is obtained on the output line (3a) of (3). When the above pulse width classification is completed, the classification result is output #i! (3a) is given to the TOI classification circuit (4), and the input pulse signal stored in the memory in the pulse width classification circuit (31) is given to the TOI+ type circuit (4) via the output line (3b). , TOI classification is performed in this TOI classification circuit (4).
I branch ode shunt circuit) also classifies the input pulse p,=p, having the TOI value TOI, ~TOi, into, for example, three 7) TOI types, and when it cannot be classified into the three odes, However, if this classification is possible, the classification result of the output @(4L) of the TOI classification circuit (4) can be obtained. The classification results of the pulse width classification circuit (3) and the TOI classification circuit (4) are applied to the comparator (5) via output lines (3a) to (C4a), respectively. In this comparator (5), the above classification result is compared with the contents of an identification table (6) which has previously set the frequency, pulse width, and TOT of a dangerous target pulse from a missile, etc., and if there is a match, the comparator (5) Output for alarm from (
7) is issued.

Next, the frequency classification circuit (2) will be explained in detail.

In the frequency classification circuit (2) shown in FIG. 2, 3υ is an input terminal to which an incoming pulse signal is supplied, (22L) (2
3a) (24a) have frequency comparison values having predetermined positive and negative gate widths for different center frequencies, respectively. 3 frequency comparison value circuit, C2'zb>(1)b)
C2Ab) is the carrier wave frequency of the pulse signal input from the input terminal and each frequency comparison value circuit (22a) (23
a) a first comparing each frequency comparison value of (24a);
Second and third frequency comparators, (22c) (23c)
(24c) represents each frequency comparator (22b) (23b) (2
In step 4b), the number of pulse signals whose carrier frequency falls within a predetermined positive/negative gate width of each frequency comparison value is counted, and the pulse signal is sent to each frequency comparison value circuit C22.
a)■a) The first, second, and third frequency classification colors are sent to (24a) to update each frequency comparison value, (221
) (23d) (24d) are each frequency classification counter (
22c) (23c) The count number counted in (24c) is compared with a predetermined comparison value from the signal line (8), and when the count number is large, the gate is opened and the frequency classification result is output from the output terminal (to). The first, second, and third frequency classification comparison gates that output
22c) When the frequency comparison value does not fall within the gate width of any of the frequency comparison values, the above-mentioned pulse signal is outputted, and it is a process failure output terminal that notifies the process failure.

Next, the operation will be explained. First, each frequency comparison circuit (
22a) (23a) (24a) and each frequency classification power f
)7 (22c) (23c) A reset pulse is input to the reset terminal R8T of (24c) to set the initial state. Now suppose that the frequency of the carrier wave of N pulse signals P or PM which are sequentially input to the input terminal (2) is set to 21 to 1.
M, the frequency Fi of the carrier wave of the pulse signal and the first
Frequency comparison value Ftm-t of frequency comparison value circuit (22a)
are compared in the first frequency comparator (22b), and if the frequency comparison value falls within the gate width FGn-, the first frequency classification power 9n (22c) counts up from n-1 to n. be done. At the same time, the first frequency classification counter (
22c), frequency 4 is the first frequency comparison circuit (22a)
The frequency comparison value Fan-1 is updated using the following equation.

Fan = Fan-+ + t/2n・CF4-FB
n-1FGn = Fan X 0.15...
・・・・・・・・・・・・・・・・・・ (1) Here, Fan: Center frequency of the frequency comparison value when count value n (however, Fao""O Fl: Input frequency n: Force 97 value (maximum value nm)X = 16)FG
n: Gate width of the frequency comparison value when the count value is n In the above equation (1), when the first frequency F is input and 9, the frequency comparison value is Fan=0 and the frequency F1 is determined by which frequency comparison value circuit C22a) C23a) (24a)
The frequency comparison value Fat=p1 is set in the frequency comparison value circuit -) via the signal @@. Other frequency comparison value circuits c23a) (24a)
The same applies to the setting of the frequency comparison value.

Next, if the frequency Fl of the carrier wave of the first pulse signal PI does not fall within the gate width FGn of the frequency comparison value Fan of the first frequency comparison value circuit (2&), the frequency Fl
The pulse signal P1 is sent to the next second frequency comparator (23b).
The frequency comparison value is compared with the frequency comparison value of the second frequency comparison value circuit (23a), and the frequency is classified in the same manner as above.

As a result of comparison with all frequency comparison values, pulse signals having frequencies that do not fall within the respective gate widths are output as they are from the unprocessable output terminal (to).

The carrier wave frequencies F and -F of the pulse signals P1 to PM input as described above are classified into three frequency classifications, and the first to third frequency classification counters (22c) (23
c) The number of pulse signals belonging to each frequency classification accumulated in each of (24c) and the predetermined comparison value input from the signal line (8) are calculated as a frequency classification comparison game) (22d) (
23d) (24d) - [When the number of pulse signals belonging to each frequency class becomes too large, the gate of the comparison gate is opened, and the next pulse width classification circuit (3) is output from the output terminal (to). At the same time, the input pulse signals P1 to PM stored in the memory in the frequency classification circuit (2) are output to the pulse width classification circuit (3). The subsequent pulse width classification circuit (3) and TOI classification circuit (4) operate on the same principle as the frequency classification circuit (2).

In the above embodiment, the classification elements of the pulse signal specifications include:
Although the frequency, pulse width, and TOI are used, an azimuth classification circuit may be provided that adds pulse arrival azimuth data to the pulse signal specifications and uses the azimuth as a pulse classification element.

〔Effect of the invention〕

As described above, according to the present invention, filtering is performed using a frequency classification circuit, a pulse width classification circuit, and a TOI classification circuit instead of a bandpass filter and a PRI filter, and further,
Since the detected pulses are compared with the identification table, the received pulses can be classified in more detail and the target can be detected as a single pulse train, which has the effect of providing a pulse detection device with high target detection accuracy. .

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the pulse detection device of the present invention, FIG. 2 is a circuit diagram of the frequency classification circuit of the above embodiment, and FIG.
The figure is a circuit diagram of a conventional pulse detection device. In Figure 2, (2) is a frequency classification circuit, (3) is a pulse width classification circuit, (4) is a TOI classification circuit, and (5) is a comparator. Show parts.

Claims (1)

[Claims] In a pulse detection device that extracts a pulse train having predetermined signal specifications from a pulse train in which a plurality of pulses are mixed,
A frequency classification circuit that classifies the carrier wave frequency of a pulse by comparing the carrier wave of the received pulse with a plurality of comparison values each having a frequency width; a pulse width classification circuit that classifies the pulse width of the pulse by comparing it with a plurality of comparison values having a width of a time interval; The present invention further includes a comparator that compares the pulse time interval classification circuit with the contents of an identification table in which the classification results of the frequency classification circuit, pulse width classification circuit, and time interval classification circuit are set in advance. Characteristic pulse detection device.