反演卷云激光雷达比的新方法  

A novel method of determining the lidar ratio in cirrus clouds

作　　者：张亚宜[1] 赵嶷飞[1] 

机构地区：[1]中国民航大学天津市空管运行规划与安全技术重点实验室,天津300300

出　　处：《光电子．激光》2013年第9期1768-1773,共6页Journal of Optoelectronics·Laser

基　　金：国家科技支撑计划(2011BAH24B10)资助项目

摘　　要：激光雷达比(消光系数与后向散射系数之比)是卷云的重要光学特性之一,提出了一种通过Mie散射激光雷达回波信号反演卷云激光雷达比的新方法。以云底气溶胶的消光系数和卷云的光学厚度两个参量为约束条件,构建以云顶气溶胶的消光系数和卷云的激光雷达比为未知参量的非线性方程组,采用粒子群算法求非线性方程组的数值解,同时获得云顶气溶胶的消光系数和卷云的激光雷达比。使用Mie散射激光雷达真实回波信号进行了实验验证,结果表明,本文方法是有效的,并且具有迭代次数少、收敛速度快的优点。The lidar ratio （the ratio of the extinction coefficient and the back scattering coefficient） is an important optical parameter. A novel method of Mie scattering lidar to determine averaged lidar ratio in cirrus clouds is proposed. This method takes two parameters of cloud bottom aerosol extinction coefficient and the optical thickness of the cirrus as constraints, constructing the nonlinear equation that contains two unknow parameters which are the aerosol extinction coefficient of cirrus＇s, top and the lidar ratio of cirrus. Then, by the use of the particle swarm optimization algorithm, the extinction coefficient of the cirrus＇s top and the lidar ratio of cirrus clouds are acquired. The experiment based on the proposed method is carried on,using the real return signals of the ground-based lidar. It＇s turned out that the proposed approach is effective ,with the advantages of fewer iterations and faster convergence of iteration. Therefore,it has a good application prospect.

关 键 词：Mie散射激光雷达 激光雷达比 卷云 粒子群算法 

分 类 号：TN958.98[电子电信—信号与信息处理]