Clutter Suppression for Wideband Radar STAP

Traditional space-time (ST) adaptive processing (STAP) theory is based on the assumption of narrowband or “zero-bandwidth,” where decorrelation within ST snapshot ignored. However, with radar bandwidths increasing, this becomes invalid due to deteriorated received signals snapshot. The directly causes dispersion in both spatial and temporal domains, leading spreading clutter spectrum 2-D frequency (Doppler-spatial frequency) domain. With spectrum, suppression notch traditional STAP filters widened, resulting a relative poor ability detect slow-moving targets. In article, we focus for wideband STAP. A generalized signal model ground first established array radar. Using outcome, analyze influence bandwidth characteristics quantitatively describe Doppler-spatial plane. Moreover, covariance matrix (W-STAP) established. Finally, keystone transform (KT) algorithm, referred as KT (ST-KT), proposed eliminate domain caused by increasing bandwidths. Simulation results are employed validate theoretical analysis verify overperformance ST-KT W-STAP method terms output signal-to-clutter-plus-noise ratio (SCNR) moving