JP2919098B2 - Fire control radar equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects a landing error by, for example, automatically tracking a moving target by a radar, firing a bullet at the moving target, and detecting an error between the moving target and the bullet. The present invention relates to a fire control radar system.

[0002]

2. Description of the Related Art As a conventional similar fire control radar system, Jane's Weapon System is exhibited as an example.
EMS 1988-89 P467-468 GOAL
It is part of the radar for KEEPER weapons equipment. Other than having a radar device using the Doppler effect as a target tracking sensor is unknown.

[0003]

SUMMARY OF THE INVENTION When an automatic impact correction type radar system using radio waves is constructed, a moving target signal and a bullet signal adjacent to the moving target are separated and extracted from radar reflected waves. There is a need. When the observation error angle between the moving target and the bullet is obtained with high accuracy, the observation error between the moving target and the bullet at the closest distance to the moving target is obtained. However, since the radar reflected wave of the bullet is very small compared to the moving target, it is difficult to separate and extract the bullet adjacent to the moving target and the moving target. In the case of configuring such an apparatus, it is necessary to be able to accurately separate the signals of the moving target and the bullet.

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving such a problem, and has as its object to extract a moving target signal and a bullet signal with high accuracy even when the moving target and the bullet are very adjacent. I do.

[0005]

[0006]

SUMMARY OF THE INVENTION A fire control radar apparatus according to the present invention selects a pass filter frequency according to a receiver for amplifying and detecting a reflected wave from a target and a target radial speed based on target tracking data. A first Doppler filter for extracting a tracking target Doppler signal from the output signal of the receiver, and a pass filter frequency based on radial velocity data based on the ballistic data of the projectile, and a projectile based on the output signal of the receiver. A second Doppler filter for extracting a Doppler signal, a first gain controller for performing automatic gain control of a receiver based on an output signal of the first Doppler filter, and emitting an initial value of the automatic gain control signal The second set based on the radar effective reflection area of the body and the launch distance
A second gain controller that performs automatic gain control of a receiver based on the output signal of the Doppler filter of the above, and monitors a target signal of an output signal of the first gain controller or an output signal of the second gain controller . A switch for controlling the receiver gain by switching between time and projectile observation in a time-division manner.

[0007]

In the present invention, the first Doppler filter and the first automatic gain controller control the gain of the receiver by focusing on the Doppler signal of only the moving target. Further, the second Doppler filter and the second automatic gain controller control the gain of the receiver by focusing on the Doppler signal of the bullet only. Also, the initial gain calculator inputs the launch distance data and the bullet radar effective reflection area data and sends the data to the second automatic gain controller.
The initial value of the gain control to be performed is calculated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a target tracking device according to the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Generally, the radar Doppler signal is
It is well known that the following equation is given. fd = 2 * fo * Vo / C fd: Doppler frequency fo: Transmission frequency Vo: Radial velocity of target or projectile (bullet, etc.) C: Radio wave propagation velocity It is well-known that frequency discrimination can be performed by switching a filter bank by a fast Fourier transform. Therefore, if the radial velocity between the target and the projectile (such as a bullet) is different, the target and the projectile can be separated, identified, and extracted by discriminating the frequency of the Doppler signal.

In FIG. 1, an antenna 1 receives a radar reflected wave. The receiver 2 receives the output of the antenna and performs amplification detection to output a received video signal 11. The first Doppler filter 3 is a filter for extracting only a target Doppler signal from the received video signal 11. The second Doppler filter 4 is a filter for extracting only a bullet Doppler signal from the received video 11.

The target extraction signal 12 is a target signal output from the first Doppler filter 3 and sent to the first automatic gain controller 5 to generate a target automatic gain control signal 14 for making the target extraction signal 12 constant. The bullet extraction signal 13 is the bullet signal output from the second Doppler filter 4 and is sent to the second automatic gain controller 6, where the bullet extraction signal 13
A bullet automatic gain control signal 15 for stabilizing 3 is generated.

The switch 7 converts the target automatic gain control signal 14 and the bullet automatic gain control signal 15 into the target / bullet observation designation signal 1
The gain control of the receiver 2 is performed by time division in accordance with the tracking target distance and the bullet detection distance.

The target tracking calculator 8 calculates the position and speed of the target with the observation distance and angle of the target as inputs, outputs the speed on the target tracking axis, that is, the target radial speed data 16, and outputs the first Doppler filter. 3 to select a passing Doppler frequency bank corresponding to the target radial speed data 16.

The trajectory specification calculator 9 receives the flying distance and elapsed time of a bullet represented based on a shooting table as inputs,
Velocity on the bullet detection axis, ie, bullet radial velocity data 1
7 is calculated based on the trajectory specifications and sent to the second Doppler filter 4 to select a passing Doppler frequency bank corresponding to the bullet radial velocity data 17.

The angle error calculator 10 outputs the target extracted signal 12
From the bullet extraction signal 13, a relative error angle between the target and the bullet is detected and calculated from the target observation angle error from the radar beam center and the bullet observation angle error, and output as an observation angle error signal 18.

FIG. 2 shows, in addition to FIG. 1, projectile distance data 21 which is the distance between the radar and the point where the target and the bullet meet from the ballistic specification calculator 9 and bullet radar effective reflection area data 22. Is input to the initial gain calculator 23, and the initial value of the gain control is calculated based on the radar method for detecting the first shot of a continuous fired bullet or a single fired bullet. , An initial gain setting signal 20 is output to the second automatic gain controller 6 so that a desired bullet signal level can be received, and the automatic gain control signal 15
By controlling the receiver 2, the initial gain is set, and the bullet extraction signal 13 is effectively obtained even for the first shot of firing.

[0016]

As described above, according to this fire control radar system, a target and a bullet are separately detected to obtain an observation angle error between the target and the bullet. , Even if the target and the bullet are adjacent,
Since the target signal and the bullet signal can be extracted by the respective Doppler filters, mutual signal interference is suppressed, and a highly accurate observation angle error can be obtained. Also, the second automatic
The gain controller sets the initial value of the automatic gain control signal to the projectile
Based on radar effective reflection area and launch distance
This is effective for bullet detection.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a fire control radar apparatus according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Receiver 3 1st Doppler filter 4 2nd Doppler filter 5 1st automatic gain controller 6 2nd automatic gain controller 7 Switch 8 Target tracking computing unit 9 Ballistic specification computing unit, 10 Angle Error detector 11 Received video signal 12 Target extraction signal 13 Bullet extraction signal 14 Target automatic gain control signal 15 Bullet automatic gain control signal 16 Target radial velocity data 17 Bullet radial velocity data 18 Observation angle error signal 19 Target / bullet observation designation signal 20 Initial value setting signal 21 Bullet distance data 22 Bullet radar effective reflection area data 23 Initial gain calculator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F41G 7/00 F41G 7/28 G01S 7/00-7/42 G01S 13/00-13/95

Claims (1)

(57) [Claims] 1. A receiver for amplifying and detecting a reflected wave from a target, and a pass filter frequency according to a target radial speed based on target tracking parameters, and extracting a tracking target Doppler signal from an output signal of the receiver. A first Doppler filter, a second Doppler filter for selecting a pass filter frequency based on radial velocity data based on the trajectory data of the projectile, and extracting a projectile Doppler signal from an output signal of the receiver; A first gain controller that performs automatic gain control of a receiver based on an output signal of the Doppler filter, and sets an initial value of the automatic gain control signal based on a radar effective reflection area and a launch distance of the projectile. The second
A second gain controller that performs automatic gain control of a receiver based on an output signal of the Doppler filter of the above, and monitors a target signal of an output signal of the first gain controller or an output signal of the second gain controller . A fire control radar apparatus comprising a switch for controlling receiver gain by switching between time and projectile observation in a time division manner.