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.

中文翻译：

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基于匹配法相位校正的全光纤相干激光雷达多普勒成像

对于相干多普勒激光雷达系统，在提高系统测速精度的同时，准确提取外差信号极为重要。针对这一问题，本文提出了基于相位校正匹配法的全光纤相干激光雷达多普勒图像。首先，采用插值法提高系统测速精度。此外，采用匹配方法对目标外差信号进行初步定位。最后，采用相位校正，准确定位外差信号，提取目标速度值。为了验证该方法，进行了模拟外差信号定位的初步模拟分析。在此基础上，通过脉冲外差相干激光成像雷达获得了真实的实验数据，并通过对比验证了所提方法的正确性。结果表明，该方法提高了弱信号相干多普勒激光雷达的速度精度。