Zero-constrained robust adaptive beam forming method

Abstract

A zero-constrained robust adaptive beam forming method provided by the invention can solve the problem that an existing diagonal loading robust adaptive beam forming algorithm cannot generate effective null in an interference signal direction. The method is realized through the following technical scheme: carrying out characteristic decomposition on a covariance matrix of a digital phased-array antenna receiving signal; by taking the maximum correlation coefficient of the estimated target signal steering vector and the characteristic vector in the covariance matrix of the received signal as the criterion, searching the characteristic vector in the covariance matrix closest to the target signal estimation steering vector as the target signal steering vector; generating a cancellation matrix according to the searched target signal characteristic vector, and obtaining an array covariance matrix after projection cancellation according to the cancellation matrix; and based on a minimum mean square error criterion, generating an array weight vector by the covariance matrix after projection cancellation, forming an interference null space by a steering vector in the interference direction, and projecting the array weight vector to the interference null space to obtain an array optimal weight vector.

Description

technical field [0001] The present invention relates to a robust adaptive beamforming method based on projection cancellation preprocessing and zero-point constraints in the field of array signal processing. Computation of optimal weights for adaptive beamforming to form deep nulls. Background technique [0002] Since the advent of radar, electromagnetic interference is an important factor restricting the performance of radar, especially man-made interference has the greatest impact on radar, so many anti-interference technologies have been born. These technologies can be divided into time domain anti-jamming technology, frequency domain anti-jamming technology, air domain anti-jamming technology, etc. Among them, the most widely used is the air domain anti-jamming technology. Airspace anti-jamming technology mainly relies on the difference between the incident angle of the jamming signal and the target signal in the airspace, and adaptively generates nulls in the direction...

AI Technical Summary

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

Images