Radar target constant false alarm detection method and system when interference orientation is known
A constant false alarm detection and radar target technology, applied in the field of signal detection, can solve the problems of low detection efficiency, achieve the effect of improving detection efficiency and shortening the time required for detection
Active Publication Date: 2021-05-25
AIR FORCE EARLY WARNING ACADEMY
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[0004] For this reason, the present invention provides a radar target constant false alarm detection method and system when the interference azimuth is known, in order to overcome the problem of low detection efficiency in the prior art
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[0053] 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.
[0054] 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.
[0055] Assuming that the number of radar system channels is N, when there are q interferences, the angle of each interference relative to the normal of the radar array is θ i , i=1,2,...,q, if there is a target, it is assumed that the angle of the target relative to the normal of the radar array is θ t , the ...
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The invention relates to a radar target constant false alarm detection method and system when an interference orientation is known, and the method comprises the steps: forming a sampling covariance matrix through employing a training sample, and carrying out the quasi-whitening processing of to-be-detected data, an interference matrix, and a signal matrix through employing a square root matrix of the sampling covariance matrix, and constructing detection statistics by using the quasi-whitened data, determining a detection threshold according to the false alarm probability and the system parameters, comparing the detection statistics with the detection threshold, if the detection statistics is smaller than the detection threshold, judging that the target does not exist, and otherwise, judging that the target exists. The detector designed by the invention can thoroughly suppress interference with known orientation information, and has a constant false alarm characteristic.
Description
technical field [0001] The invention relates to the technical field of signal detection, in particular to a constant false alarm detection method and system for a radar target when the interference azimuth is known. Background technique [0002] The existence of interference greatly weakens the target detection performance of the radar. On the one hand, the interference increases the false alarm probability of the radar by simulating the radar target information. On the other hand, the interference drowns the real radar target signal by simulating the characteristics of noise. Thereby reducing the radar detection probability of the target. [0003] For the target detection problem in the presence of interference, the traditional method generally performs interference suppression first, and then performs constant false alarm processing, which not only has cumbersome steps, but also has low detection efficiency and low anti-interference performance. Contents of the invention...
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IPC IPC(8): G01S7/41
CPCG01S7/41G01S7/414
Inventor 刘维建杜庆磊王永良李槟槟周必雷王洪林
Owner AIR FORCE EARLY WARNING ACADEMY