Analysis and modification to the method of bistatic clutter range dependence mitigation

Clutter range dependence mitigation is very important for bistatic space-time adaptive processing (STAP) radar. The paper focuses on the technique of clutter spectrum registration-based nonuniform frequency sampling (RB-NFS). Analysis indicates RB-NFS method brings inadequate clutter rejection and the dependence on STAP training sample number. Modifications to RB-NFS method are proposed to solve the problems. Simulations prove the correctness of analysis of RB-NFS. STAP with modified RB-NFS is hardly affected by the number of training samples and can achieve approximately optimal performance even with only two training samples.