Detection Method and detection device of distance expansion target based on reverberation covariance matrix

Abstract

The invention relates to a detection method of distance expansion target based on a reverberation covariance matrix. The detection method includes that a group of echo data is obtained through a sonar array, and main data and auxiliary data with the same reverberation covariance matrix are selected from the group of the echo data. Through utilization of the main data, the auxiliary data and the pseudosymmetry characteristic of the reverberation covariance matrix, pseudosymmetry representation information of the reverberation covariance matrix is computed and sampled. The pseudosymmetry representation information of the main data, the pseudosymmetry representation information of the reverberation covariance matrix in maximum likelihood estimation and the structure of the reverberation covariance matrix have predetermined pseudosymmetry characteristics, and a detection statistical amount is calculated through supplement of nominal guide vector of the distance expansion target. The distance expansion target is judged whether exists through a compared result of the detection statistical amount and a predetermined threshold value. The priori characteristic of the reverberation covariance matrix is utilized, and detection performance is quite good on the condition of small sample auxiliary data. Performance of high-resolution active sonar under an uneven environment is effectively improved.

Description

technical field [0001] The present invention relates to sonar technology, in particular to a method and device for detecting a range-extending target based on a reverberation covariance matrix Background technique [0002] The range resolution of low-resolution active sonar is much larger than the military target size, and the actual target has the characteristics of a point target, and its echo has the same form as the transmitted signal. Therefore, the target echo detection problem in the reverberation background can be reduced to the detection problem of the known waveform with random parameters, and the corresponding detector is based on the matched filter of the transmitted signal. [0003] Active sonar operating in shallow seas is more affected by reverberation, especially submarine reverberation, than in deep sea environments. In order to compensate for the loss of detection performance, high-resolution active sonar came into being. Due to the improvement of range r...

AI Technical Summary

Problems solved by technology

In this case, uniform auxiliary data is difficult to obtain, and even if it can be obtained, its sample size is very limited, resulting in a significant drop in the detection performance of existing range-extended targets.

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