The application of median based estimators in robust adaptive beamforming for high frequency radar

Abstract

If adaptive beamforming is applied prior to Doppler processing in the radar sweep domain, weight jitters which occur as a result of the adaptation process will reduce sweep coherence and cause mismatched Doppler processing. If some sweeps of the radar signal are corrupted by directional interference of an impulsive nature, it is shown that the performance of the block adaptation approach can be improved by the application of median based estimators in selecting the weights for a beam from intermediate sweeps. This paper introduces the method for attenuating impulsive directional interference while avoiding weight jitters.