多普勒激光雷达回波信号的蒙特卡罗模拟

摘要

In order to study light's propagation in terms of multiple scattering in complex geometrical or heterogeneous media,especially in atmosphere,semi-analysis Monte Carlo method was used,and relative returned signals of the lidar under different atmospheric conditions and systematic parameters were emulated.Consequently,time-relative returned signal curve was derived.And the influence of field of view (FOV) on the returned signal was discussed in detail.It is concluded that while FOV is very narrow,the curve is nearly as the same of single scattering curve,and that with the augment of FOV,single scattering decreases,multiple scattering enhances.%为了研究光在复杂几何形状和非均匀介质,尤其是激光在大气中的多次散射传输问题,采用半解析蒙特卡罗方法,对不同气象条件和系统参量下的激光雷达回波信号进行了数值模拟,得到了相对回波信号随时间变化的分布曲线,并分析了接收机视场角对回波信号的影响.结果表明,当接收视场角较小时,回波信号曲线与单次散射曲线近似重合,随着接收视场角的增大,单次散射作用减弱,多次散射作用增强.