Sea clutter suppression method based on radar signal space-time decorrelation model

Abstract

The invention relates to a sea clutter suppression method based on a radar signal space-time decorrelation model, and belongs to the technical field of sea clutter suppression. The method comprises the steps: 1, enabling a radar to process echo signals into echo data and arrange the echo data to obtain an NK-dimensional column data vector; 2, establishing a spatial domain and time domain decorrelation model of the sea clutter; establishing a clutter and noise covariance matrix model; 3, calculating a projection matrix of a to-be-detected unit; calculating a data vector of the to-be-detected unit after the target signal is eliminated; 4, establishing a clutter and noise covariance matrix estimation formula, calculating the value of a weight coefficient, and calculating an estimated value; 5, calculating an adaptive processing weight vector according to the optimal adaptive processing criterion; step 6, calculating a self-adaptive processing output result of the to-be-detected unit; according to the method, the clutter and noise covariance matrix estimation precision under a small sample is improved, and the problems that the output loss of a low-speed moving target is large and thesea clutter suppression performance is not stable in an existing sea clutter suppression technology are solved.

Description

technical field [0001] The invention belongs to the technical field of sea clutter suppression, and relates to a sea clutter suppression method based on a radar signal space-time decorrelation model. Background technique [0002] The multi-channel radar of the motion platform has a wide observation range, a high degree of spatial freedom, and the ability to suppress clutter in space-time two-dimensional scenes. It can realize accurate detection and positioning of moving targets, and is widely used in the fields of urban traffic surveillance and military reconnaissance and early warning. In the sea monitoring mode, the multi-channel radar of the moving platform needs to suppress the sea clutter to display the moving target of interest, so as to realize the detection and positioning of the moving target. [0003] At present, multi-channel radar sea clutter suppression technology for moving platforms is mainly divided into two types: time-domain filtering processing and space-t...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the deficiencies of the prior art, propose a sea clutter suppression method based on the radar signal space-time decorrelation model, improve the estimation accuracy of the clutter plus noise covariance matrix under small samples, and solve the problem of The existing sea clutter suppression technology has the problems of large output loss and unstable sea clutter suppression performance for slow-moving targets

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