DOA Estimation for Strong and Weak Signals in the Presence of Array Gain and Phase Mismatch

A new method for estimating direction of arrival (DOA) of the strong and weak signals is proposed in the presence of array gain and phase mismatch. Firstly, the array gain and phase mismatch is estimated using the norm of the error vector between the practical steering vector and the theoretical vector of the strong signal, and then the data covariance matrix is calibrated. Secondly, the new seek vectors are obtained by the eigenbeamforming normalization with the eigenvalues and eigenvectors of the calibrated covariance matrix. Finally, the directions of arrival of all the signals are estimated according to the spatial spectrum like MUSIC with the new seek steering vector. The proposed method has the simpler computation and the more accuracy compared with RELAX and JJM. The effectiveness and the superiority are demonstrated via the simulation results.