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差分像移激光雷达可以测量随距离分布的大气湍流廓线。在结合测量原理和定性分析的基础上,经过严格的数学推导得到了差分像移激光雷达测量湍流的误差公式,提供了定量分析和改进系统性能的基础:在系统参数确定后,通过合理分配探测点间距以及每个探测点的探测时间可以达到最好的测量效果。根据模拟分析的结果,测量误差主要来源于光斑质心计算误差和有限样本引起的统计误差。近距离测量时,由于接收到的光子信号很强,光斑质心计算误差的影响很小,此时样本统计误差起主导作用;随着距离的增加,光斑质心计算误差的影响越来越大。
Differential imaging lidar can measure atmospheric turbulence profile with distance distribution. Based on the principle of measurement and qualitative analysis, the error formula of turbulent flow in differential image-lidar is obtained through rigorous mathematical derivation, which provides the basis for quantitative analysis and improvement of system performance. After the system parameters are determined, Pitch and the detection time of each detection point can achieve the best measurement results. According to the results of the simulation analysis, the measurement error mainly comes from the calculation error of the centroid of the spot and the statistical error caused by the finite sample. In the case of short-distance measurement, the statistical errors of the samples play a leading role due to the strong photon signal received and the influence of the centroid error of the spot centroids. With the increase of the distance, the influence of the calculation error of the centroid of the spot is more and more significant.