Low-Sidelobe Robust Adaptive Digital Beamforming Under Single Snapshot

In this paper, a new low-sidelobe robust adaptive digital beamforming (ADBF) method is presented. ADBF is known to degrade severely when underlying assumptions are violated in practical application, the high sidelobe level also introduces interferences which have rapid time-varying properties. The proposed method generates a pseudo sample covariance matrix under single snapshot, estimates the direction of arrival (DOA) by ESPRIT and computes the optimal low-sidelobe quiescent weights with an additional special constraints. Under single snapshot, this approach adaptively nulls the interferences, fixes the steering direction error and suppresses the sidelobe to an acceptable level whether signals are coherent or not.