A Fast Clutter Suppression Method Based on Hybrid Auxiliary Channels for Spaceborne Multichannel Radar Systems

As for the clutter suppression based on dimension-reduced space-time adaptive processing (STAP) in a spaceborne multichannel radar system, the performances of different auxiliary channels are theoretically analyzed in this article. Then, an improved dimension-reduced STAP based on hybrid auxiliary channels is proposed. In this method, the localized angle-Doppler domain processing is chosen and a hybrid structure of auxiliary channels from sliding windows and adjacent channels is adopted to suppress the clutter spectral leakage components. The selection method of auxiliary channels is also analyzed. Compared with other STAP methods, the proposed method can fully suppress the clutter spectral leakage components and approach an ideal target detection performance, while requiring low computation complexity and a small number of independent and identically distributed (i.i.d.) samples.