激光雷达常数的测量研究

Study for Measurement of Lidar Constant

提出了一种新的激光雷达常数的确定方法。利用在大气气溶胶水平分布均匀的天气条件下,在无几何因子影响的区域通过激光雷达消光后向散射比和美国大气模式的数值计算得到激光雷达常数。理论上分析了误差来源,由激光雷达消光后向散射比引起最大的误差小于12.27%。最后根据测量信号计算得到本系统激光雷达常数为600668.2 sr.km3,其标准偏差小于13%。不同时刻的测量结果显示了很好的一致性,表明该方法是可行的。激光雷达常数的获取为评估激光系统以及激光雷达方程的参数反演带来的便利。

A new method is presented to determinate lidar constant.Under the condition of homogenous horizontal atmosphere,the lidar constant can be calculated with transcendent knowledge about lidar ratio and American atmospheric mode.The source of error is analyzed and the biggest relative error of lidar constant caused by lidar constant error is lower than 12.27% theoretically.Finally lidar constant determinated with lidar returning signal is 600668.2 sr·km^3 and its standard deviation is lower than 13%.The good consistency of result in different time indicates the feasibility of the method.The achievement of lidar constant can be offer convenience for retrieve of aerosol in lidar equation and evaluation of lidar system.