The accuracy of speed measurement is an important parameter of coherent Doppler lidar.Echo signal processing method is the focus of the current research. A series of velocity measurement experiments are carried out. Maximum likelihood discretization estimation is used to estimate the spectrum frequency,which is then realized by Matlab and simulation toolbox. Analysis of velocity measurement error combined with relevant parameters found that when correlation coefficient is higher,the velocity measurement error generally becomes smaller.The biggest velocity measurement error will be smaller than 0.5 m/s and the average error will be less than 0.3m/s using maximum likelihood estimation.%测速精度是相干激光雷达系统的一个重要参数,着重对雷达回波信号处理方法进行分析研究.开展了一系列1.55 μm相干激光雷达测速实验,采用最大似然离散谱方法对信号进行频谱估计,并通过Matlab编程与仿真工具箱共同实现.当频谱信息与高斯曲线逼近程度较高时,系统测速精确度较高.采用最大似然离散谱峰值估计方法进行频谱估计可保证系统最大测速误差小于0.5m/s,平均测速误差小于0.3m/s.
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