Extended target adaptive detection method and system based on oblique projection under interference

A technology for self-adaptive detection and target expansion. It is applied in radio wave measurement systems, measurement devices, and radio wave reflection/re-radiation. It can solve problems such as poor detection performance and complex processes, suppress interference and simplify the detection process. , the effect of improving the detection efficiency

Active Publication Date: 2021-05-14
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0004] In order to overcome the problems of complex process and poor detection performance of the existing detection technology, the present invention is based on the idea of ​​adaptive detection, and provides an adaptive detection method and system for extended targets based on oblique projection under interference

Method used

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  • Extended target adaptive detection method and system based on oblique projection under interference
  • Extended target adaptive detection method and system based on oblique projection under interference
  • Extended target adaptive detection method and system based on oblique projection under interference

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Embodiment Construction

[0050] In order to make the objects and advantages of the present invention clearer, the present invention will be further described below in conjunction with the examples; it should be understood that the specific examples described here are only for explaining the present invention, and are not intended to limit the present invention.

[0051] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

[0052] Assume that the number of radar system channels is , the target expansion dimension is , then when the data to be detected contains targets, interference, clutter and thermal noise, the data to be detected can be used Dimensional matrix is ​​expressed as:

[0053] (1)

[0054] in, dimension ...

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Abstract

The invention relates to an extended target adaptive detection method and system based on oblique projection under interference. Firstly, a signal matrix, an interference matrix, a to-be-detected data matrix and a training sample matrix are constructed, then a sampling covariance matrix and an inverse matrix of a square root matrix of the sampling covariance matrix are constructed according to a training sample, and then the signal matrix, the interference matrix and the to-be-detected data matrix are whitened according to the square root matrix. Then an oblique projection matrix is constructed according to the whitened signal matrix and the whitened interference matrix, detection statistics is constructed according to the oblique projection matrix and the whitened to-be-detected data matrix, and a detection threshold is determined according to a false alarm probability set by a system and the detection statistics; and finally, the detection statistical magnitude is compared with the detection threshold to judge whether the target exists or not. According to the detector designed by the invention, interference can be thoroughly suppressed, target detection is realized, and independent filtering and constant false alarm processing flows are not needed.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to an extended target self-adaptive detection method and system based on oblique projection under interference. Background technique [0002] With the development and progress of radar technology, its capability has been continuously improved, and its range resolution has been continuously enhanced. Therefore, targets often occupy multiple range resolution units, especially for targets such as large ship targets and strategic bombers. At this time, traditional detection methods based on point target models are no longer applicable. On the other hand, electromagnetic interference is becoming more and more frequent, which seriously affects the performance of radar detection. [0003] Aiming at the problem of target detection under interference, the traditional method adopts the method of filtering first and then constant false alarm processing to detect the target. First, th...

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Application Information

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IPC IPC(8): G01S13/04G01S7/41
CPCG01S7/41G01S13/04
Inventor 刘维建李槟槟周必雷杜庆磊陈辉王永良
Owner AIR FORCE EARLY WARNING ACADEMY
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