Airborne radar clutter suppression method based on covariance matrix estimation

Abstract

The invention discloses an airborne radar clutter suppression method based on covariance matrix estimation. The idea is that airborne radar pulses z<nl> received by the nth array element at the lth range gate after fast Fourier transform and airborne radar echo z<kl> received by the kth Doppler channel of N array elements at the lth range gate are calculated, and airborne radar etch z'<kl> of the kth Doppler channel and the lth range gate of N array elements after dimension reduction processing and an airborne radar echo clutter covariance matrix R<kl> of the kth Doppler channel and the lth range gate of N array elements are calculated; and an airborne radar echo covariance weight coefficient matrix beta<kl> of the kth Doppler channel and the lth range gate of N array elements after the pth time of iteration and an airborne radar echo clutter optimal covariance matrix R<^><kl> of the kth Doppler channel and the lth range gate of N array elements are calculated, and airborne radar echo clutter of the kth Doppler channel and the lth range gate of N array elements after space-time self-adaptive filtering processing is calculated so that the range-Doppler spectrum corresponding to array element-Doppler domain airborne radar echo is calculated.

Description

technical field [0001] The invention belongs to the technical field of radar clutter suppression, in particular to an airborne radar clutter suppression method based on covariance matrix estimation, and is based on a cascaded two-dimensional space-time processing method under the condition of non-uniform clutter, and is suitable for oblique side arrays Carrier radar clutter suppression or non-frontal array airborne radar clutter suppression. Background technique [0002] Airborne early warning radar has become an important part of early warning intelligence, battlefield surveillance and combat command systems in modern warfare. It can significantly increase the detection distance of low-altitude penetration targets and greatly improve the effectiveness of weapon systems. It plays an increasingly important role in modern warfare. It plays an increasingly important role and is highly valued by major military powers. The beam of the airborne early warning radar is generally ho...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the inaccurate problem of covariance matrix estimation in the above-mentioned prior art in a non-uniform clutter environment, the purpose of the present invention is to make full use of airborne radar array elements and airborne radar pulse echoes, and propose a method based on covariance matrix estimation The airborne radar clutter suppression method based on the covariance matrix estimation method is based on the iterative covariance matrix estimation form, so as to perform airborne radar clutter suppression, aiming at the non-uniform clutter environment Improving the suppression performance of airborne radar clutter

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