Method of Resolving the Range Ambiguity for High PRF Stepped-Frequency Radar

High PRF stepped-frequency radar can achieve simultaneously the advantages of pulse Doppler (PD) and high range resolution (HRR) radar, but it's difficult to resolve the range ambiguity brought about by high PRF. In this paper, a novel method based on the phase difference out of the FFT between two adjacent range cells is proposed to solve the problem. This method firstly solves the range/Doppler coupling in the FFT by iterative reckoning between the range and the Doppler of a target and the accuracy of both reach 5 high resolution bins respectively. Secondly, it eliminates the effects of the target motion to the phase difference, consequently the accuracy of resolving the range ambiguity is reasonably high. Simulation verifies its validity