Some New Techniques of Localization of Spatially Distributed Sources

In this paper, we consider the problem of estimating the direction-of-arrivals (DOAs) and angular spreads of coherently (CD) and incoherently distributed (ID) sources. The proposed methods exploit some properties of the generalized steering vector in the case of CD sources and some properties of the covariance matrix in the case of ID sources to enable a decoupled estimation of the DOAs from that of the angular spreads of sources. Using a uniform linear array (ULA), the proposed methods improve the robustness to the mismodeling of the spatial distribution of the distributed CD and ID sources. Simulation results show that, the proposed methods exhibit a better estimation performance compared with the conventional methods.