A Fast 2D DOA Estimation Based on Dual-Polarized Cylindrical Array with Gain and Phase Uncertainties

In this paper, we propose a blind polarization 2-D DOA estimation algorithm based on the dual-polarized cylindrical conformal array in the presence of gain and phase uncertainties. Using the characteristic of the cylindrical conformal array, 2-D DOA estimation can be divided into 1-D estimations of elevation and azimuth, and no parameter pairing is required. Estimation Signal Parameters via Rotational Invariance Technique (ESPRIT) is used to estimate elevation by modeling the array into two identical cylindrical sub-arrays. Due to the sparsity of the signals, the corresponding azimuths are discretized into grids based on the obtained elevation. Then, the Dual-Polarized Simultaneous Orthogonal Matching Pursuit (DP-SOMP) algorithm is proposed to estimate azimuth under the framework of sparse reconstruction. Furthermore, the elevation can be re-estimated to improve the accuracy because of the higher robustness of the SOMP to gain and phase errors. Simulations exhibit the effectiveness and superiority of the proposed method.