JPH028764A - Signal detector of radar apparatus - Google Patents

Abstract

PURPOSE:To prevent the overload of the number of messages by counting the objective number of messages at every one rotation of an antenna to compare the same with an output message reference value and prohibiting the output of the target of a predetermined region when the count value exceeds said reference value. CONSTITUTION:MTI and NORM videos of MTI and NORM are inputted to terminals 1, 3 respectively and the NORM video is also inputted to a selection control circuit 10 to measure a video average level in a required azimuth width and distance width region unit. The hit 7 due to the MTI video and the hit 8 due to the NORM video are selected on the basis of a video selection signal 11 by a video selection circuit 9 and the MTI video is selected in a region where the clutter of the NORM video is much. A correlation circuit 13 performs the pattern confirmation relating to a distance and an azimuth on the basis of an MIR/NORM hit 12 to detect target data 14. A message preparation circuit 15 outputs the data 14 as a target message 16 and the number of inputs of the data 14 are counted in one revolution unit of an antenna to be compared with a limit value and, when the number of outputs exceed the limit value, a detection control signal 18 is sent to the circuit 10 to send out a detection prohibiting signal 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal detection device for a radar device.

(Prior art) Fig. 2 shows a signal detection method of a conventional radar device.In the figure, 1 is an input terminal for inputting MTI video,
3 is an input terminal for inputting the slice level for quantizing TI video, 4 is an input terminal for inputting the slice level for quantizing NORM video, 5 is for quantizing MTI video. slicer,
6 is a slicer that quantizes NORM video, 7 is MTI
8 is a hit by NORM video, 9 is a video selection circuit, 10 is a video selection control circuit, 1
1 is a video selection signal, 12 is a video selection signal 1 for hit 7 by MTI video and hit 8 by NORM video.
13 is a correlation circuit, 14 is target information, 15 is a message creation circuit, 16 is a target message, and 17 is an output terminal of the target message.

Next, the operation will be explained.

This signal detection method is related to information processing of a radar device. The MTI video and NORM video detected by the receiver of the radar device are input to input terminals 1 and 3.

The MT1 video is a video in which clutter has been removed based on the NORM video in the receiving device and a moving target has been detected. Slicers 5 and 6 quantize based on the slicer levels input from input terminals 2 and 4. The NORM video inputted from the input terminal 3 is quantized by the slicer 6 and simultaneously inputted to the video selection control circuit 1o, where the video average level is measured for each region of a required azimuth width and distance width. The video selection control circuit 10 includes NORM
Video selection standard (VstL, 10m++4) and MT
There is an I video selection standard (V!EL, M?+), which is compared with the video average level (VW) and performs the following operations.

V3□, NOIIM ≧ V, -NORM video selection VstL, str ≦V s MT I Hite t3Jl selection V! ! L, N01lN < V
M < V ltL, MTl Through such processing without updating the video selection, the video selection control circuit 10 outputs the video selection signal 11 to the video selection circuit 9, and the video selection circuit 9 outputs the HIT 7 and NOR signals from the MTI video.
The correlation circuit 13 selects the M video output from the video selection circuit 9, and selects the MTI video in areas with a lot of clutter in the NORM video.
Target information 14 is detected by performing pattern recognition regarding distance and direction based on the TI/NORM hit 12.

Thereafter, the message creation circuit 15 creates the target information 14 in a format that can be output as a message, and outputs the target message 16 from the output terminal 17.

Figure 3 shows the relationship between the video and the detection target. - Much target information is detected from close range clutter inside the shell. Although the MTI video is selected as the clutter region, since clutter remains in the MTI video, even if detected targets are obtained, many false targets due to clutter are included.

[Problem to be solved by the invention]

The conventional signal detection method is configured as described above, and the detected target information is output for all detected targets, so when the number of messages becomes overloaded in the radar host system or other systems, had rejected the message without being able to judge whether it was a target or a false target.

This invention was made to solve the above problems, and provides a signal detection device for a radar device that can prevent the number of messages from becoming overloaded in a radar host system or other systems. The purpose is to

[Means to solve the problem]

The signal detection device for a radar device according to the present invention counts the number of detected target messages and controls the detection area so that the number of detected messages per rotation of the antenna does not exceed a specified value.

[Effect]

In the signal detection method according to the present invention, the number of target messages is counted every rotation of the antenna, and this is compared with a reference value of output messages per rotation of the antenna. If the number exceeds the standard value, the target output of a predetermined area is prohibited.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is an input terminal for inputting MTI video, 2 is an input terminal for inputting a slice level for quantizing MTI video, 3 is an input terminal for inputting NORM video, and 4 is an input terminal for quantizing NORM video. Input terminal for inputting slice level; 5 is a slicer for quantizing MTI video; 6 is a slicer for quantizing NORM video; 7
8 is a hit by MTI video, 8 is a hit by NORM video, 9 is a video selection circuit, and 10 is a video selection control circuit having the function of a control means for controlling so that the number of targets detected per rotation of the antenna does not exceed a specified value. , 11 is a video selection signal, 12 is a hit 7 and N by MTI video.
MTI/NORM hit 8 selected by ORM video with video selection signal 11; 13 a correlation circuit as means for detecting a target; 14 target information; 15 message creation with a counting means for counting the number of detected targets. circuit,
16 is a target message, 17 is an output terminal of the target message, 18 is a detection control signal for limiting the number of target messages 16, and 19 is a detection prohibition signal based on the detection control signal 18.

Next, the operation will be explained.

This method is related to information processing of a radar device.

MT detected by the receiver of the radar device! video and no
RM video is input through input terminals 1 and 3. The MTI video is a video obtained by removing clutter based on the NORM video in the receiving device and adding a moving target. Slicers 5 and 6 quantize based on the slicer levels input from input terminals 2 and 4. The NORM video input from the input terminal 3 is quantized by the slicer 6, and at the same time,
The signal is input to the video selection control circuit 10, and the video average level is measured for each area having a required azimuth width and a required distance width. The video selection control circuit IO has a NORM video selection standard (V SEL, Ho114) and an MTI video selection standard (vstL, xt+), and performs the following operations by comparing with the video average level (VM).

vOLjNOIN ≧V H vstt, I4t+ ≦V 14 Vstt, No*x < VNNORM Video selection MTI video selection < VSKL, Nite! Through such processing that does not update the video selection, the video selection control circuit 10 outputs the video selection signal 11 to the video selection circuit 9.
The correlation circuit 13 selects the M video hit 8 and selects the MTI video in areas with a lot of clutter in the NORM video.
Target information 14 is detected by performing pattern recognition regarding distance and direction based on the TI/NORM hit 12.

After that, the message creation circuit 15 sends information about the goal! 114 is created in a format that can be output as a message, and outputted from the output terminal 17 as the target message 16.

In parallel with the process of outputting the target information 14 as a message, the message generation circuit 15 counts the number of inputs of the target information 14 per rotation of the antenna.

The message creation circuit 15 has a limit value for the number of messages per rotation of the antenna, and compares it with the number of message outputs.If the number of output messages exceeds the limit value for the number of messages, it sends a detection control signal 18 to the video selection control circuit 10. is output and a detection prohibition instruction is given by a detection prohibition signal 19.The detection control signal 18 is provided with three stages of control, and is controlled by the video selection control circuit 10 as follows.

Detection control signal Control OFF ---1 First stage of whole area detection -m-Second stage of prohibition of detection of strong clutter regions -m-Third stage of prohibition of detection of clutter regions -m-
Prohibiting area detection Next, the flow of control will be explained. In the initial state, the detection control signal 18 is OFF. The message creation circuit 15 compares the number of message outputs with the limit value for the number of messages, and if the number of message outputs is large, the process moves to the first stage of control and instructs the video selection control circuit 10. Since the video selection control circuit 10 holds the amplitude level of the NORM video in units of regions, a strong clutter region is determined and a detection prohibition signal 19 is output to the correlation circuit 13.

Generally, areas with many false targets are areas with strong clutter, so the first step is to prohibit detection of areas with strong clutter, but even with the first step of control, the number of messages still exceeds the message limit. If it is exceeded, the process moves to the second stage, where the area where detection is prohibited is expanded, and detection of the area where the MTI video is selected, that is, the clutter area, is prohibited. If the number of message outputs still exceeds the message number limit value even after moving to the second stage, the process moves to the third stage and prohibits detection of the entire area.

In the above embodiment, the case where the number of output messages related to the area within the -shell is limited was explained. However, if the radar device uses a pencil beam and electronically scans the space, the pencil beam By classifying the beam into elevation angle and high elevation angle, more detailed control is possible, and the same effects as in the above embodiment can be achieved.

In that case, the detection control signal and control will be as follows.

Detection control signal Kari OFF -1 1st stage of whole area detection -1 2nd stage of prohibition of detection of strong clutter region of low beam -1 3rd stage of prohibition of detection of strong clutter region of low beam and high beam 11! -1 4th stage of prohibition of detection of low beam clutter areas and high beam strong clutter areas -1 5th stage of prohibition of detection of low beam and high beam clutter areas -1 Prohibition of detection of entire area [Effects of the invention] Above and above According to the present invention, the number of message outputs is counted and the output is limited according to the counted value, so the output can be matched to the processing capacity of the host system or other systems, and these can be prevented from overloading. You can prevent this from happening.

In addition, when limiting the number of message outputs, instead of limiting target messages unconditionally, limiting them in the order of strong rutter areas and clutter areas, which have many false targets, will reduce the negative impact on the radar system. It has the effect of reducing and controlling

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a signal detection device for a radar device according to an embodiment of the present invention, FIG. 2 is a diagram showing a conventional signal detection method, and FIG. 3 is a diagram showing the relationship between a video and a detection target. 1 is an input terminal for inputting MTI video, 2 is a slice level input terminal for quantizing MTl video, 5 is NO
Input terminal for inputting RM video, 4 is slice level input terminal for quantizing NORM video, 5 is MT [slicer for video, 6 is slicer for NORM video,
7 is a hit by MTI video, 8 is a hit by NORM video, 9 is a video selection circuit, IO is a video selection control circuit (control means), 11 is a video selection signal, 12 is M
TI/NORM hit, 13 is a correlation circuit (target detection means), 14 is target information, 15 is a message creation circuit (counting means), 16 is a target message, 17 is an output terminal of the target message, 18 is a detection control signal, 19 is a detection prohibition signal. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a signal detection device of a radar device, a target detection means for detecting a target, a counting means for counting the number of targets detected by the target detection means, and a means for preventing the number of targets detected per one rotation of the antenna from exceeding a specified value. 1. A signal detection device for a radar device, comprising: control means for performing control.