将成像激光雷达这一新型主动大气探测手段运用于水平大气透过率测量研究。采用矩阵图像错位相加法提高信噪比。获取随距离变化的信号之后, 通过Klett积分结合斜率法的反演方式获得1 km以内水平传输路径上的消光系数分布, 对消光系数进行路径积分, 计算出水平大气透过率。将反演结果与对比实验中直接测量的大气透过率进行对比分析, 发现不同天气情况下两者的相关性系数在0.7以上, 相对误差在20%以内。该成像激光雷达设备可进行有限距离的水平大气透过率探测研究。

A new active atmospheric detection means of the imaging lidar is used in the horizontal atmospheric transmittance detection. A matrix image dislocation addition method is proposed to improve the signal to noise ratio. When the signal which is changing with the distance is obtained, an inversion method combined with the slope method and Klett integration is adopted to retrieve the extinction coefficient distribution in 1 km horizontal transmission path. The horizontal atmospheric transmittance can be achieved based on the path integral of extinction coefficient. By comparing the inversion results of comparing experiments with the atmospheric transmittance obtained in direct measurements, we find that the correlation coefficient is over 0.7 and the relative error is within 20%. The imaging lidar can be an instrument for the study on detecting the horizontal atmospheric transmittance in the finite range.