基于微脉冲激光雷达的能见度反演算法

在基于后向散射原理的大气能见度测量过程中,大气消光系数边界值的选取对反演精度具有较大影响。提出一种基于弦截法的大气消光系数边界值的确定方法,并利用迭代的思想对边界值的选取结果进行修正。通过理论仿真和实地测量对本方法的可行性进行验证,结果表明,弦截法具有较快的收敛速度,且迭代次数较少,经过比对迭代修正之后的消光系数边界值可以更准确的反演出大气消光系数,进而实现大气能见度的高精度测量,具有较强的实际应用价值。

Visibility inversion algorithm based on micro pulse lidar

In the process of atmospheric visibility measurement based on the backscattering principle, the selection of atmospheric extinction coefficient boundary value has a great influence on the inversion accuracy. In this paper, a method for determining the boundary value of atmospheric extinction coefficient based on secant method is proposed, and the selection result of boundary value is modified by iterative idea. The validity of the method is verified by theoretical simulation and actual measurement. The results show that this approach has faster convergence and fewer iteration times. The extinction coefficient boundary value after iteration can be used to retrieve the atmospheric extinction coefficient more accurately and realize the high precision measurement of atmospheric visibility. And it has great practical application value.