A stagewise fast DOA estimation method based on sparse signal representation

In this paper, a stagewise approach has been adopted in the Direction of Arrival (DOA) estimation procedure to improve the speed and efficiency of the whole estimation, i.e. a coarse estimation is firstly carried out by means of Minimum Variance Distortionless Response (MVDR) to provide a smaller searching angle for the secondary high precision estimator, which is realized by a modified Orthogonal Matching Pursuit (OMP) algorithm with the access of spatial over-complete dictionary. Simulations demonstrate that compared with methods that are based on sparse signal representation approaches the proposed method could provide a drastic reduction of the calculation load and meanwhile it could keep a better resolution than that of OMP or traditional methods like Multiple Signal Classification (MUSIC) under low SNR few snapshots, which has proved its effectiveness and efficiency.