Robust adaptive phase-only beamforming algorithm for interference suppression

摘要

The adaptive phase-only beamforming technique is very important for suppressing interferences in phased array radar. However, similar to the conventional beamforming technique, which features variable magnitudes and phases, the performance of phase-only beamforming is severely degraded by steering direction and array geometry errors. No studies on this problem are available. In this paper, the problem of adequate robustness for adaptive phase-only beamformers is investigated, and a robust phase-only beamforming algorithm based on semidefinite relaxation is proposed. This algorithm can suppress interferences by minimizing the array output power and maintain the desired signal without distortion. Robust adaptive phase-only weighting is first converted into a non-convex quadratic optimization problem and then into a convex optimization problem by the semidefinite relaxation technique, which can be solved easily. Experimental results demonstrate that the new robust adaptive phase-only beamforming algorithm can significantly reduce performance degradation caused by various array errors. Copyright (c) 2014 John Wiley & Sons, Ltd.