Adaptive interference pre-suppression ΣΔ-beamforming for ΣΔ-STAP

For airborne radar, interference is sophisticated. The original ΣΔ-STAP assumes that there will be a separate pre-suppression for jammers. Previous pre-suppression approaches utilize sideband jammer-only data. If sideband data are not available, previous pre-suppression approaches can not be applied. Or if there exist mainlobe jammers, conventional ΣΔ-beamforming can not suppress such interference sufficiently low so that the original ΣΔ-STAP will suffer. In this paper, an adaptive ΣΔ-beamforming approach, i.e., adaptive interference pre-suppression ΣΔ-beamforming for ΣΔ-STAP, is proposed. This new method doesn´t utilize sideband data. Via simulations it is shown that the new method can suppress either sidelobe interferes or mainlobe ones. Especially for mainlobe ones, the advantages of the new method are significant.