A virtual array method for direction of arrival estimation based on unitary transformation

To estimate direction of arrival for the coherent signals,a virtual array method for direction of arrival estimation based on unitary transformation is proposed.In this approach,the covariance matrix,which is obtained from virtual array,is reconstructed by utilizing a unitary transformation matrix.The simulation results verify that the proposed method has high performance of de-correlation and estimation.The proposed method can de-correlate the coherent sources without a lot of snapshots and a reduction in array aperture.All of matrix computation are in real-valued space,thus,the computation complexity is very low.