Research on DOA Estimation Methods of Coherent Sources in the Presence of Impulsive Noise
Jian Guan · Journal of Microwaves · 2008
This paper is concerned with the direction of arrival(DOA) estimation of coherent sources in impulse noise fields modeled as symmetric α stable(SαS) distribution.Robust covariation(ROC) based MUSIC and Frational lower moment(FLOM) based MUSIC cannot be used to estimate the DOA under these conditions.New forward-backward smoothing(FBS)-covariation matrices and FBS-FLOM matrices are first defined by applying the spatial smooting idea to covariation matrices and FLOM matrices.Two new algorithms based on FBS-covariation matrices and FBS-FLOM matrices are presented in the meantime.Theoretical analysis shows that noise subspace can be estimated by the eigen-decomposition of FBS covariation matrices and FBS-FLOM matrices so as to estimate the DOA of coherent sources in impulse noise.Moreover,performance of two new algorithms is analyzed by comparison.Computer simulation results verify the correctness and effectiveness of the proposed methods.