Spatial Time-frequency DOA Estimation Under α Stable Distribution Noise

The performance of Direction of Arrival(DOA) estimation based on conventional Spatial Time-frequency Multiple Signal Classifi-cation(STF-MUSCI) degenerates in α stable distribution environment.A new Time-frequency Fractional Lower Order Moment MUSIC(TF-FLOM-MUSIC) method is proposed,second covariance matrix is substituted by Fractional Lower Order Matrix(FLOM) and Fractional Lower Order Moment Spatial Time-frequency Distribution Matrix(FLOM-STFDM) is defined,FLOM-STFDM is decomposed in the method.DOA estimation Mean Squared Error(MSE) and Generalized Signal Noise Ratio(GSNR) are analyzed and algorithm steps are summarized.Simulation results show that TF-FLOM-MUSIC algorithm can reduce effectively DOA estimation MSE and improve estimation resolution.