Beamspace DOA estimation algorithms with robustness against fast-moving strong interferers

All beamspace DOA (direction of arrival) estimation algorithms are based on the beam outputs and the beamformers play an important role in providing high quality beam output data for further processing. In this paper, robust Capon beamformer (RCB) combined with null-broadening technique is applied to the element outputs. It can effectively suppress the fast-moving strong interferers outside the beam coverage region and overcome the distortion in beampattern due to array steering vector errors. Performance of beamspace MUSIC using null broadened robust beamformers against fast moving interferer is studied via computer simulation for uniform linear array. The simulation results show that the proposed scheme has good spatial resolution and improved detection probability of weak stationary signals