Performance Analysis of Space-Borne Early Warning Radar for AMTI

Space-borne early warning radar has great military and civil significance in ground, air, and space moving target detection in virtue of its wide-area coverage ability, where air moving target indication (AMTI) is an essential task for space-borne early warning radar. As for the AMTI mode, it is inevitably to handle the ground strong clutters due to the large surveillance area, and space-time adaptive processing (STAP) technique can be successfully applied to suppress the troubled clutter effectively. However, the clutter rejection performance of STAP will be restricted by many non-ideal factors, such as range ambiguity, channel number, and yaw angle induced by earth's rotation; thus it is necessary to analyze the influence of these practical non-ideal factors. In this paper, the multichannel signal model of clutter and air moving target in a space-borne radar (SBR) system are deduced. Then, we analysis the adverse influences of these non-ideal factors on STAP in detail. Finally, some simulation processing results are provided to validate the STAP performance with the consideration of these engineer factors, which can provide some useful guides of SBR system design with AMTI mode.