Direction of arrival estimation and identification of mixed circular and non-circularity sources

Most of existing array signals processing methods are based on the homogeneous circular or non-circular sources. However, mixed circular and non-circular sources are frequently encountered in increasingly complex situations. Since the useful properties of the mixed source model are not utilized efficiently, there is significant performance space between the methods based on homogeneous source model and the theoretical bound. In this paper, an enhanced direction-of-arrival(DOA) estimation and identification method for mixed circular and non-circular sources is proposed. Simulation results show that it can improve the resolution capability and the number of mixed sources can be larger than the number of array elements.