Range Ambiguity Clutter Suppression Method for Space-Air Based Bistatic Radar

Conventional Doppler warping (DW) method has good suppression effect for space-air based bistatic radar (SABBR) non-stationary clutter. But if radar geometrical configuration relations are unknown and range ambiguity exists, conventional DW method cannot be used. Aiming at range ambiguity clutter suppression problem for SABBR, a non-stationary clutter suppression method is put forward based on the ideas of improved DW method and reconstructing clutter covariance matrix (IDW+RCCM). Firstly, clutter covariance matrix of specified range ring is estimated through improved DW method. Then, power spectrum of the range ring is calculated as the amplitude value, and the clutter data and covariance matrix of the ambiguous range rings are reconstructed. Finally, the reconstructed data is used to achieve space-time adaptive processing for the range ambiguity clutter. Simulation results demonstrate the effectiveness of the proposed method.