Efficient DSPE algorithm for estimating the angular parameters of coherently distributed sources

In this paper, we consider the problem of estimating the direction-of-arrivals (DOAs) and angular spreads of uncorrelated coherently distributed sources. The proposed method enables a decoupled estimation of the DOAs from that of the angular spreads of sources with small angular spread. Therefore, compared with the original DSPE algorithm, the proposed algorithm improves the robustness to the mismodeling of the spatial distribution of sources at least for two popular distribution shapes (Gaussian and uniform). Furthermore, the proposed method works even in the case where the different sources do not have same angular distribution shape.