Fast Orthogonal Propagator Direction-Finding Algorithm Based on Fourth-Order Cumulants
Heping Shi, Wen Leng, Anguo Wang, Hua Chen, Yuchu Ji · The Applied Computational Electromagnetics Society Journal (ACES) · 2015
In this paper, a low complexity approach called modified fourth-order cumulants orthonormal propagator method (MFOC-OPM) is proposed for direction-of-arrival (DOA) estimation of incident narrowband signals impinging on a uniform linear array (ULA). In the proposed algorithm, the modified fourthorder cumulants (MFOC) matrix is achieved via removing the redundant information encompassed in the primary fourth-order cumulants (FOC) matrix, and then the direction-of-arrivals (DOAs) estimation of source signals can be resolved by exploiting the orthonormal propagator method (OPM). Without any spectrum-peak searching and eigenvalue decomposition (EVD) of the MFOC matrix, the theoretical analysis coupled with simulation results show that in comparison with the MFOC-MUSIC algorithm, the resultant algorithm can reduce computational complexity significantly, as well as yield good estimation performance in both spatiallywhite noise and spatially-color noise environments.