The beamspace conjugate MUSIC for non-circular sources

Since beamspace MUSIC (BM-MUSIC) method cannot resolve coherent sources, and the use of spatial smoothing pre-process leads to array aperture loss and reduction in detectable source numbers, a new beamspace MUSIC (BMC-MUSIC) method is presented for non-circular sources to this end. The proposed method exploits the characteristics of non-circular sources to construct conjugate symmetric Toeplitz matrix from received data vectors to form pseudo covariance matrix, then the source directions of arrival (DOAs) are estimated by techniques similar to BM-MUSIC method. Simulation results show that the proposed method can resolve coherent sources using a single or few snapshots without spatial smoothing preprocessing and its performance is better than the BM-MUSIC method with spatial smoothing.