All-fiber coherent lidar Doppler imaging based on phase correction with matching method

Abstract

For a coherent Doppler lidar system, it is extremely important to accurately extract the heterodyne signal while improving the system’s speed measurement accuracy. In this paper, All-fiber coherent lidar Doppler image based on phase correction with matching method is proposed to solve this problem. First, the interpolation method is adopted to improve the system speed measurement accuracy. In addition, the matching method is adopted to initially locate the target heterodyne signal. Finally, the phase correction is adopted to accurately locate the heterodyne signal to extract the target speed value. In order to verify the method, a preliminary simulation analysis of the simulated heterodyne signal localization is performed. Based on this, real experimental data were obtained by pulse heterodyne coherent laser imaging radar, and the correctness of the proposed method was verified by comparison. The results show that the method improves the velocity accuracy of weak signal coherent Doppler lidar.