Robust Adaptive Beamforming Method with Zero Constraint

Abstract

The robust adaptive beam forming method with zero point constraint proposed by the present invention can solve the problem that the existing robust adaptive beam forming algorithm of the diagonal loading type cannot generate effective nulls in the direction of the interference signal. The present invention is realized by the following technical scheme: carry out eigendecomposition on the covariance matrix of the received signal of the digital phased array antenna; take the maximum correlation coefficient of the eigenvector in the estimated target signal steering vector and the covariance matrix of the received signal as the criterion, search for The eigenvector in the covariance matrix closest to the estimated steering vector of the target signal is used as the target signal steering vector; the cancellation matrix is ​​generated according to the target signal eigenvector obtained by the search, and the array covariance matrix after projection cancellation is obtained from the cancellation matrix; Based on the minimum mean square error criterion, the array weight vector is generated from the covariance matrix after projection cancellation, the interference null space is formed by the steering vector of the interference direction, and the optimal weight vector of the array is obtained by projecting the array weight vector to the interference null space.

Description

technical field [0001] The present invention relates to a robust adaptive beamforming method based on projection cancellation preprocessing and zero point constraint in the field of array signal processing, and more specifically, it is capable of accurately determining the direction of arrival (DOA) when the estimation of direction of arrival (DOA) is inaccurate. Calculation method of optimal weights for adaptive beamforming with deep nulls. Background technique [0002] Since the advent of radar, electromagnetic interference has been an important factor restricting the performance of radar, especially man-made interference has the greatest impact on radar, so many anti-jamming technologies have been born. These technologies can be divided into time-domain anti-jamming technology, frequency-domain anti-jamming technology, and air-space anti-jamming technology, among which the most widely used is air-space anti-jamming technology. The spatial anti-jamming technology mainly r...

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Problems solved by technology

[0005] In order to overcome the difficulties of the traditional method in practical application, the task of the present invention is to propose a method that can effectively correct the target steering vector mismatch error caused by the target DOA estimation error, and address the shortcomings of the above-mentioned prior art. A digital phased array antenna zero-point constrained robust adaptive beamforming method that can generate deep nulls in the direction of the interference signal to solve the problem that the existing diagonally loaded robust adaptive beamforming algorithm cannot generate effective nulls in the direction of the interference signal The problem

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