A Second-Order Conjugate Augmented MUSIC algorithm for direction finding

A new direction finding algorithm called Second-Order Conjugate Augmented MUSIC (SO-CAM) is proposed in this paper. The basic idea of SO-CAM is to use the conjugate augmented cross-correlation to derive the pseudo-data matrix from which the pseudo covariance matrix is constructed. Then the directions of arrivals (DOAs) of the signals are estimated by MUSIC algorithm. SO-CAM can resolve two times the number of DOAs when compared to MUSIC algorithm for uniform linear array (ULA). Moreover, simulation results show that the resolution performance of SO-CAM algorithm is better than MUSIC and MUSIC-like in small sample case.