A target detection method and system in the presence of interference in a compound Gaussian environment

Abstract

The invention relates to a target detection method and system when there is interference in a compound Gaussian environment. First construct signal matrix, interference matrix, data vector to be detected and training sample vector set; then transform the data vector to be detected and training sample vector into a matrix; then use the training sample matrix to estimate the covariance matrix; then use the signal matrix, interference matrix , the transformed data matrix to be detected and the covariance matrix are estimated, and the detection statistics are constructed; finally, the detection threshold is determined according to the false alarm probability and detection statistics set by the system, and the size of the detection statistics and the detection threshold is compared to make a A verdict on whether or not the target exists. The detector designed in the present invention is based on the idea of ​​self-adaptive detection, integratedly realizes clutter suppression, interference suppression, signal accumulation and constant false alarm processing, and by using the central conjugate symmetry characteristic of the covariance matrix, the required number of training samples dropped by half.

Description

technical field [0001] The invention belongs to the technical field of signal detection, and more specifically relates to a target detection method and system when there is interference in a compound Gaussian environment. Background technique [0002] The electromagnetic environment in which radar works is complex and changeable. On the one hand, the radar is faced with interference released by the enemy, which can greatly weaken the combat effectiveness of the radar, and even make the radar completely invalid; on the other hand, in addition to possible target signals and interference, the radar received data often also contains , High-intensity clutter reflected by ground objects. In order to ensure the normal performance of combat effectiveness, the radar needs to solve the target detection problem in the clutter and interference environment. [0003] If the interference mode changes slowly, the radar can obtain the necessary information of interference by increasing the...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a target detection method and system in the presence of interference in a compound Gaussian environment. detection problem

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