DOA Estimation of Coherent Signals via Improved MVDR Algorithm
Hong Zhen-qing · Electronic Information Warfare Technology · 2012
MVDR(minimum variance distortion response)algorithm is a classical beamforming algotithm in array signal processing,and it also can be used for DOA estimating,but there has usually a low resolution.In order to resolve this shortage,an improved algorithm is proposed.An augmentation matrix is constructed firstly by this algorithm via rearranging its receiving data matrix,then SVD(singular value decomposition) is used to solve augmentation matrix inversion and the traditional MVDR algorithm is used to estimate DOA lastly.Compared with the traditional MVDR algorithm and forward and backward spatial smoothing algorithm,the simulation results indicate in the fewer elements and lower snapshots conditions,this improved algorithm has a higher estimating accuracy and resolution,so it is also a good algorithm of coherent signals DOA estimation.