An implementation of phase error compensation algorithm

Objective: The stepped-frequency chirp signal is a wide band radar signal which can obtain high resolution range profiles. But when it come across phase discordance, the energy of target cannot be accumulated and the corresponding radar system cannot detect any targets. In order to resolve the effect of phase uncertainties, an novel phase error compensation method is proposed in this paper. Method: Research into the phase characteristic of a group of stepped-frequency chirp signals using the FFT algorithm, the phase difference between each received stepped-frequency chirp signal and the transmitted signal can be calculated and the phase compensation is carried out by using a compensator and a look-up table. Result & Conclusion: The sampled stepped-frequency is used to simulate the proposed algorithm, the phase error is compensated and the high resolution range profiles can be easily obtained. The validity and the feasible of the algorithm are verified through the simulations.