Abstract: In post-Doppler processing methods of space time adaptive processing (STAP) available, when the window function is not used, Doppler channels are orthogonal, and even when window function is used, the correlation between channels is not high. A new post-Doppler processing STAP method is proposed, which improves the correlation between channel of interest and auxiliary channels, reduces the degree of freedom of clutter and lightens the burden of spatial adaptive processing, by reducing their space. It can restrain clutter well and improve the 3DT method by 0.5dB. It is also highly robust to errors as high as 10％. Its validity is illustrated through experiment utilizing raw data of the airborne dual-channel radar system.

Key words: space time adaptive processing, Doppler, ∑Δ-beam, degrees-of-freedom of the clutter, improvement factor