Direction-of-Arrival Estimation in Non-uniform Linear Array with Gain-Phase Error Compensation

Gain and phase error sensitivity of the array output is an issue common to all high-resolution direction of arrival estimators. In this paper, we addressed the estimation of directions of arrival of multiple signals impinging on a non-uniform linear array in the presence of gain and phase perturbations. The effect of amplitude and phase distortion on a non-uniform array with defective or missing elements is considered. An iteration method is proposed to estimate and compensate for these errors to ensure maximum accuracy in DOA estimation. The proposed method performs well with sufficiently large errors for a range of SNR with a smaller number of snapshots. The RMSE value is largely reduced after compensation even with more defective elements. Computer simulation results are shown to justify the efficacy of the proposed algorithm in various scenarios.