Motion compensation for missile-borne frequency stepped chirp radar

Motion compensation is a key problem for frequency stepped chirp radar (FSCR) in realizing synthetic high range resolution. In this paper, a novel velocity estimation algorithm based on the waveform entropy (WE) of the Doppler amplitude spectrum is developed for missile-borne FSCR, in order to compensate the target echo´s additional phase resulting from the motion between the radar and the target. Without altering the conventional radar waveform, the new method can accurately estimate the radial velocity between the radar and the target and can be implemented on the in-service radars. Moreover, the method can be used for the scenario of multi-target with different velocities. It will be shown that the algorithm can effectively estimate the radial velocity and reconstruct the distorted HRRP successfully. In addition, the anti-noise performance of the proposed algorithm is well and the computation burden is acceptable for real time signal processing.