Decoupled estimation of the central DOA and angular spread for coherently distributed source

In this paper, we consider the problem of estimating the parameter — the central directions of arrival (DOA) and angular spread of distributed source by one-dimension searching algorithm based on preliminary estimate of the central DOA. Decoupling the estimation of the central DOA from that of angular spread enable two-step procedure. The preliminary estimate of the central DOA can be obtained at a signal subspace, which downsize searching scope. The proposed algorithm has improved precision, low computational cost and sufficient robustness. Simulations clearly demonstrate that the algorithm is not only effective, but also enjoys better performance compared with DSPE algorithm.