The technique of diagonal reduction processed with underwater acoustic array signal

A beamforming method based on array signal covariance matrix diagonal reduction is proposed. By estimating enough snapshots, a stable covariance matrix of the received signal is obtained. Through the appropriate covariance matrix diagonal reduction, the array output gain and the multi-target resolving ability can be improved. In this paper, the conventional beamforming (CBF) and minimum variance distortionless response (MVDR) beamformer's array gains were deduced and simulated based on diagonal reduction. The relationship between the array gain and reduction coefficient is analyzed and the reduction coefficient range for resolving multiple targets is studied. The results showed that the diagonal reduction method can improve the multi-target resolving ability of MVDR effectively. ©, 2014, Editorial Board of Journal of HEU. All right reserved.