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利用激光雷达探测水云的光学和微物理特性时,水云的多次散射会在雷达回波中产生去极化信号,给出了半解析蒙特卡罗方法模拟偏振激光雷达后向散射去极化率的详细过程,给出了0.532μm激光作为光源入射时,典型水云的后向散射Muller矩阵二维分布图,以及水平线偏振、垂直线偏振、+45°线偏振和右旋圆偏振光入射时,后向散射的Stokes矢量的二维分布图,最后给出了去极化率和极化率随激光雷达接收视场角以及穿透深度的变化。从数据结果可以看出,接收视场角越大,多次散射的影响越大。给出的蒙特卡罗模拟方法对利用激光雷达遥感反演水云和球形气溶胶的特性具有重要的应用价值。
When using laser radar to detect the optical and micro-physical properties of water clouds, multiple scattering of water clouds will produce depolarization signals in radar echoes, and a semi-analytical Monte Carlo method is proposed to simulate the polarization The detailed two-dimensional distribution of the backscattering Muller matrix of a typical water cloud when a 0.532μm laser is used as a light source is given. The horizontal polarization, the vertical polarization, the + 45 ° linear polarization and the right circular polarization At the time of incident, backscattered two-dimensional Stokes vectors of the distribution, and finally gives the depolarization rate and polarization rate with lidar receiving field angle and penetration depth changes. It can be seen from the data results that the larger the receiving angle of view, the greater the impact of multiple scattering. The given Monte Carlo simulation method has important application value for the remote sensing inversion of water cloud and spherical aerosol by using lidar.