Space-time adaptive processing based on Beam-Doppler shift for bistatic radar

Range dependence of bistatic clutter brings degradation of clutter suppression performance in space-time adaptive processing (STAP). The paper established clutter modeling of airborne bistatic radar, derived the analytical expressions of spatial and Doppler frequencies. Based on the clutter modeling and analysis of registration-based compensation (RBC) method, Beam-Doppler shift (BDS) technique to mitigate clutter range dependence in STAP was proposed, which transforms clutter snapshot into beam-Doppler domain and perform clutter spectrum registration. Owing to the processing of snapshots, BDS technique is easily performed. Computer simulations indicate BDS is affected less by FFT points number than RBC method, and has better performance in the case of giving attention to computation load.