Underdetermined DOA Estimation of Quasi-stationary Signals Based on Rotational Invariance Array

In this paper,a new algorithm is proposed to overcome the shortcomings of KR-MUSIC such as strong restriction of array structure and high computation complexity resulting from spatially spectral search.The proposed method relaxes uniform linear array structure to milder rotational invariance one,and has lower computation complexity by only performing analytical operation.In addition,N²/2 DOA can be estimated by our proposed algorithm,as it is only 2N-1 for KR-MUSIC.Simulation results show that proposed algorithm has better performance than KR-MUSIC for the same number of frames,length of frame and signal-to-noise ratio.