JPS5927277A - Radar signal processor - Google Patents

Abstract

PURPOSE:To eliminate massive processing of unnecessary data at a far distance while minimizing escape from the tracking at a close distance by varing the azimuth-wise length of a window according to the distance. CONSTITUTION:The center position C of a window W is determined from the size of a target and the distance R thereof from a video signal V inputted with a window factors decision circuit 5. A window with (a) in the direction of azimuth is decided so as to be reversely proportional to the distance R. The window width (b) in the direction of distance is always fixed as the maximum value is 1. A window W is generated with a window generation circuit 4 from factors thus obtained and a video signal V' is extracted with a gate circuit 1. The expanse of a video is reduced to one point with a gravity center computing circuit 2 and the target position is determined with a target position decision circuit 3. This enables an accurate detection of the target position thereby eliminating unnecessary data processing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to trust processing in a radar device, and particularly to a signal processing device for a radar having a tracking function.

As a conventional device of this type, there is one shown in FIG. In Figure 1, (1) is a gate circuit that captures one video signal V while the window W is open, and (2) is a gate circuit that collects the captured/recessed signal V' into one point by calculating the center of gravity. The small calculation circuit (3) is a target determining circuit that determines the target arbitrary device, and (4) is a window generating circuit that determines the window W for the next transmission from the target position IN t.

Next, the operation will be explained. Window generation circuit (4)
, a window W having a width of 1 in the distance direction and a width of 1 in the azimuth direction is generated with the target position as the center (see Figure 2). This window W is the gate circuit (1). The center of gravity calculation circuit (2) acts as a gate for the video signal PI'v and collects data on the proximity of the tracking target.
Now, only one point is found from the collected data V'. The video signal v usually has a certain spread, and if there is a spread,
This is because it is inconvenient for signal processing, transmission, etc. The value that becomes one point in the center of gravity calculation circuit (2) is the center of the window W (Fig. 2C
Since only the deviation from the previous target position (see) can be calculated, the latest target position i can be obtained by adding up the previous target position and the deviation in the target determining circuit (3).

This target position t becomes the center C of the next window W.

The conventional device of this type is constructed as shown in Figure 2, and since the width is fixed, the distance in the azimuth direction (a in Figure 2) increases as the target approaches. ) becomes short, and if the radar bag is sufficiently close to the radar bag, the target may fall out of the window, making it impossible to track the target sufficiently.

This invention is as follows. This is a specially designed model that eliminates the shortcomings of the conventional model, and by changing the length of the wind in the azimuth direction depending on the distance, it is less likely that the target will escape from being tracked at short distances. The purpose is to JJij (J'i) the radar signal 1'3 processing device d, which eliminates the need to process unnecessary data at large distances.

An embodiment of the present invention will be described below with reference to the drawings. 8th
In the figure, (1) is a gate circuit that takes in the video signal V while the window W is listening, and (2) is the gate circuit (
A center of gravity arithmetic circuit that determines the center of gravity of the video signal F) v' obtained in 1) and detects the movement of the target, and (3) a target determination circuit that determines the target position t based on the movement of the target and the previous target position. , (5) is a wind specification determining circuit that determines the center of the next window W from the target position and the width of the window W in the azimuth direction from the distance of the bidet 4 signal 'i5v. This is a window generation circuit that generates a window W according to specifications.

First, in the window specification determination circuit (5), the center position of the window W is determined from the target position t (see Figure 4 C), and its distance from the manually input video signal V (see Figure 4 1) is determined. Then, the window width in the azimuthal direction (see FIG. 4C) is determined so as to be inversely proportional to the distance R. This window width a is determined by the antenna.

From the specifications obtained in this way, the two-f-nd generation circuit (4)
Then, a window W is generated, and the gate circuit (1) extracts the target video signal jU■t. The spread of the video is set to one point by the ilt center calculation circuit), and the target position [-1 mark a) is determined by the 1 position determination circuit (3).

This embodiment has an Ambuna rotational speed of 80 n+nt R small units, a range bin of 1 km in the distance direction and approximately 2.8 degrees in the azimuth direction, and is capable of tracking targets with speeds up to 1.67 degrees. It is a radar signal processing device, and the distance direction of the wind is fixed at 5 range bins, and the azimuth direction is fixed at 8 to 11 range bins.
up to ij) changed.

As shown in Figure 2, according to this invention, the length of the window in the azimuth direction is changed according to the distance 1'fi1. There are fewer cases where unnecessary data is stored over long distances.
This has the effect of eliminating the need for processing in step 1.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a conventional radar signal processing device, and Figure 2 is a diagram of the system shown in Figure 1. Figure 1, 8th
The figure is a system diagram of a processing device according to an embodiment of the present invention, and FIG. 4 is a partial diagram showing changes in the window of the device shown in FIG. In the figure, (1) is the gate circuit, (2) 1 is iTt+
(3) is a target position determination circuit, (4) is a window 'F color' IE II circuit, and (5) is a window specification determination circuit. Note that in the drawings, the same arrows indicate the same or equivalent parts. ] 111 people Kuzura Town (Figure 1 Figure 3 Figure 4 Figure 4

Claims (1)

[Claims] (1) A radar signal processing device that processes video signal-1 of a radar device having a tracking function and detects a target position,
A wind specification determining circuit that determines the wind specifications according to the video distance direction position of the target to be tracked and the previously detected target position, and generates a window for capturing the video signal according to the bet source. a wind generation circuit that causes
From the window obtained by the window generation circuit, the above video (1
a gate circuit that takes in the signal, a center of gravity calculation circuit that calculates the center of gravity of the spread of the video signal obtained by the gate circuit and calculates the movement of the 112 target; A radar signal processing device characterized in that it is equipped with a target determination circuit that determines the latest target position using the radar signal.