A Target Detection Method Based on Phase Information Clutter Map
A technology of target detection and phase information, applied in the field of radar, can solve problems such as affecting the accuracy of clutter power estimation and affecting target detection performance, and achieve the effects of improving detection performance, reducing missed alarms, and comprehensive information
Active Publication Date: 2021-12-31
XIDIAN UNIV
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Problems solved by technology
Since the clutter map requires recursive calculation and accumulation of inter-frame data, when the moving speed of the target is very slow, the target may not get out of the clutter unit within multiple radar antenna scanning cycles, which will cause the target signal to also participate in the clutter map The accumulation of updates affects the accuracy of clutter power estimation, thereby affecting the performance of target detection. This is the phenomenon of self-shadowing
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[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] An embodiment of the present invention provides a target detection method based on phase information clutter diagram, such as figure 1 As shown, the method includes the following steps:
[0025] Step 1, set M azimuths within the radar scanning range.
[0026] According to the radar scanning range and beam width, the azimuth number M of the radar scanning range and the azimuth direction θ are obtained m , m=1, 2,..., M, to get the directions of each az...
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The invention belongs to the technical field of radar, and discloses a target detection method based on phase information clutter maps, including: 1) establishing a relatively stable multi-channel clutter map according to the scanning data of the previous few laps of the radar; 2) performing a new lap Scanning to obtain the scanning data of the circle; 3) according to the newly received scanning data in the radar and the previously established clutter map, use its phase information to perform clutter detection, and obtain the detection result; 4) use the new data received in 2) Update the established clutter map; 5) Repeat steps 2), 3), and 4), thereby reducing the false alarm caused when the target echo is weak, avoiding the "self-shadowing" phenomenon, and improving the detection of low-speed targets performance.
Description
technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a target detection method based on a phase information clutter map, which can be used for low-speed target detection under the condition of weak echo. Background technique [0002] With the advancement of modern technology, more and more new aircrafts appear. The rapid development of low-altitude, slow-speed, and small targets represented by unmanned aerial vehicles (UAVs) requires higher and higher radar detection target performance. For a long time, radars have not been very effective in detecting low-speed targets. The difficulty in detecting low-speed targets lies in the serious overlap between the target and the ground clutter spectrum in the Doppler domain. Because the ground clutter intensity is usually very large, it is required to filter the clutter before target detection, but the traditional signal processing methods, such as moving target display MTI and mo...
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IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 赵永波席明日刘宏伟何学辉苏洪涛苏涛
Owner XIDIAN UNIV