Underwater sound array SMI-MVDR spatial spectrum estimation method based on diagonal load shedding

The invention provides an underwater sound array SMI-MVDR spatial spectrum estimation method based on diagonal load shedding. Signals are received by a sonar horizontal linear array, self-correlation processing is carried out on the singles received by the sonar horizontal linear array to obtain a sampling matrix, characteristic values of the sampling matrix are obtained by carrying out SVD singular value decomposition on the sampling matrix, the optimal loading shedding coefficient is further calculated, the sampling matrix is multiplied by the optimal loading shedding coefficient to obtain a self-correlation matrix after the diagonal load shedding, and SMI-MVDR beam forming is further carried out to obtain an output result of a spatial spectrum estimation. According to the underwater sound array SMI-MVDR spatial spectrum estimation method based on the diagonal load shedding, the characteristics of the lower signal to noise ratio and the time variant of an underwater sound environment can be overcome effectively, multiple targets can be distinguished, the azimuth angle of each target can be estimated accurately, and wide application prospects in underwater sound array signal processing can be achieved.