JPS60214284A - Pulse radar - Google Patents

Abstract

PURPOSE:To discriminate whether there is one target or plural targets by comparing the angle error signal of a previously stored calculated or measured value when there is one target with an angle error signal in antenna scanning. CONSTITUTION:A target detector 11 decides whether a target is caught or not from the output level of a monopulse receiver 4 and outputs some voltage when so. A switch 12 is driven by its output voltage and switches the flow of an angle error signal to the side of an angle error signal comparator. A bias voltage applying circuit 13 applies an antenna servo controller 6 with a bias voltage for giving an antenna 1 a specific scanning angle with the output voltage of said target detector 11. An angle error signal comparator 14 decides whether there are plural targets or not by comparing the angle error signal of the stored calculated or measured value when there is one target with the angle error signal in antenna scanning.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to improvements in pulse radar.

[Prior art]

An example of the configuration of a conventional Noval radar is shown in FIG.

In the figure, (1) is a monopulse antenna that transmits and receives radio waves and outputs the received Ig signal as a sum and difference signal, and (2) is a duplexer that distinguishes the transmitted signal from the transmitter and the received signal from antenna fi+. , (3) is a transmitter that transmits a pulse waveform radio wave, (a) is a monopulse receiver that converts the received sum and difference signals into an F signal, amplifies it, and then outputs a detection signal and an angle error signal. 5) is a target indicator that displays the output of the detection signal of the monopulse receiver (4);
) is an antenna servo controller that outputs a signal for driving the antenna servo according to the output of the angle error signal, and (7) is an antenna servo that scans the antenna (1).

FIG. 2 shows an example of a pulse radar and two targets.

In the figure, (8) is the pulse radar, and (9) is the antenna pattern.

Q[I is a goal.

In the conventional pulse radar, as shown in Fig. 2, two targets equidistant from the radar within the antenna beam width receive the received signals by the monopulse antenna (1) and output them as sum and difference signals. The monopulse receiver (4) outputs a detection signal and an angle error signal, but the detection signal is 1.
The detection signal is similar to that of the target, but it has the disadvantage of being considered as one target.

It was impossible to distinguish between one target and multiple targets.

[Summary of the invention]

This invention was made in an attempt to improve these conventional problems.In order to determine whether a single target or multiple targets is detected, the antenna is forcibly scanned when a target is detected. Compare the calculated value or measured value of the angular error signal for one target and the angular error signal during antenna scanning, and if the angle error signal of 1 is memorized in advance. We propose a pulse radar that detects a target and issues an alarm. [Embodiment of the Invention] FIG. 3 shows an example of the configuration of a pulse radar according to the present invention.

In the figure, (1) to (7) are the same as in FIG. Oυ determines whether the target is detected by the magnitude of the output of the detection signal from the monopulse receiver (4).

a target detector that outputs a certain voltage when the target is captured; az is driven by the output voltage of the target detector aυ; a switch that switches the flow of the angle error signal to the angle error signal comparator; +141 is a bias voltage adding circuit that applies a bias voltage to the antenna servo controller (6) in order to give a constant scanning angle to the antenna (1) using the output voltage of the target detector. An angular error signal comparator that determines whether there are multiple targets by comparing the angular error signal of the calculated value and measured value at the time of one target and the angular error signal at the time of antenna scanning, a9 is the angular error of α Xun This is a multiple target alarm device that issues an alarm when multiple targets are detected based on the output of the signal comparator.

FIG. 4 shows the calculation results of the antenna scanning angle and the output value of the angular error signal when the antenna beam width is 5°. The solid line is 1
This is the angular error signal output value when the target angular error is 0°. Bankruptcy is when two targets are each at an angle of 2°,
In other words, this is an example of one shift of angular error signal output when there are two targets within one beam.

In FIG. 1, the horizontal axis represents the antenna scanning angle, and the vertical axis represents the output value of the angle error signal. It is also assumed that the effective reflection areas of the two targets and the distances to the radar are the same.

The formula for calculating the output value t of the angular error signal in the case of two targets is as follows.

Kls (ξ1) + 2B (ξ2) here.

σ1. σ2: Effective reflection area ξ of targets 1 and 2, respectively
1 ξ2: Angular error from the antenna boresight direction when looking at l RTM 1 rRTM2: Distance between targets 1 and 2, respectively, and the radar S(ξ): ξ of the antenna sum pattern
Voltage directivity D(ξ): Voltage directivity in the ξ direction of antenna difference pattern As shown in Figure 4, the slope of the angular error signal becomes smaller when there are two targets than when there is one target. ing. From this, in order to determine whether there is one target or multiple targets, when a target is detected, 1. Forcibly scan the antenna and compare the slope of the angular error signal at that time with the angular error signal of the calculated value or measured value at 1 target, which has been stored in advance, and find out that the angle error signal is 1 times smaller than the above angular error signal. When it becomes smaller, it can be determined that there are two targets and a warning can be issued. Furthermore, the above effects are also obtained for three or more targets.

〔Effect of the invention〕

As described above, in the pulse radar according to the present invention, even if the mantissa target is equidistant 1'' from the radar and within the beam width of the antenna, it is possible to determine whether it is one target or multiple targets, and the magnitude of the threat to the target can be determined using the system. This will have the effect of making it possible to decide on the operation of air defense systems to intercept the enemy.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the configuration of a conventional pulse radar. FIG. 2 is a diagram showing an example of a pulse radar and two targets, FIG. 3 is a diagram showing an example of the configuration of the pulse radar in this invention, and FIG.
The figure is a diagram showing calculation results of the antenna scanning angle and the output value of the angular error signal. In the figure, (1) is a monopulse antenna,
(2) is the duplexer 5 (J) is the transmitter, (4) is the three monopulse receivers, and (5) is the target indicator. (6) is an antenna servo controller, and (7) is an antenna servo. +8) LD pulse radar, (91 rj antenna pattern, uG H2 target, θB is target detector, q4 is switch, 93 is Karo circuit with bias tank pressure, <141 is angle-difference signal compensator. A multi-target indicator is shown. In Figure 1, the same or equivalent parts are marked with the same size number. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] A transmitter for transmitting pulse waveform radio waves. A monopulse antenna that transmits and receives radio waves and outputs the received signal as a sum and difference signal, a duplexer that distinguishes the transmitted signal from the transmitter and the received signal from the monopulse antenna, and the sum and difference signals received by the monopulse antenna. a monopulse receiver that converts a difference signal into an IP signal, amplifies it, and then outputs a detection signal and an angular error signal; a target display that displays the detection signal of the monopulse receiver; and an angular error signal of the monopulse receiver. In a pulse radar equipped with an antenna servo controller that outputs an antenna servo driving signal that scans the monopulse antenna in response to a target detector that outputs a predetermined voltage when the target is detected;
a switch driven by the output voltage of the target detector to switch the flow of the angle error signal of the monopulse receiver to the angle error signal comparator side; and a switch driven by the output voltage of the target detector to switch the flow of the angle error signal of the monopulse receiver to the angle error signal comparator side; and a bias voltage adding circuit that adds bias voltage to the antenna servo controller to give a constant scanning angle to the antenna. an angular error signal comparator that determines whether there are multiple targets by comparing a pre-stored angular error signal of a calculated value or measured value at the time of the target with an angular error signal at the time of antenna scanning; @Nokurusradar is equipped with a multi-target alarm that issues a VC alarm when multiple targets are determined.