STFDs and FBSS Techniques for Direction of Arrival Estimation of Coherent LFM
Li Dengxin, Cui Kaibo, Jia Hongyang, Yuan Naichang · 2021
A novel direction of arrival (DOA) estimation algorithm for coherent linear frequency modulated (LFM) sources called time-frequency forward/backward spatial smoothing (TF-FBSS) algorithm is proposed. This new algorithm estimates DOAs using the time-frequency (TF) analysis tools and the forward/backward spatial smoothing (FBSS) techniques. The proposed algorithm constructs the spatial time-frequency distributions (STFDs) of the array by selecting a plurality of TF points. Then, the time-varying manifold matrix of the LFM signals in the time domain is transformed to a time-invariant manifold matrix in the TF domain. Finally, we can use the FBSS techniques to distinguish the coherent LFM sources. The simulation results show the good performance of the proposed algorithm.