激光在云层中传输的特性分析及蒙特卡罗模拟

Analysis of characteristics of light propagation through clouds and Monte Carlo simulation

为了研究激光在云层中传输的多次散射特性,分析了传输过程中的功率损耗,并采用蒙特卡罗法模拟传输过程,得出时间展宽后的脉冲波形。结果表明,时间展宽后的脉冲具有陡峭的上升沿和指数形式的收尾;非对称因子、云层物理厚度、消光系数、接收视场角等对时间展宽都有影响,其中,非对称因子、云层物理厚度对时间展宽及时间延迟影响较大。

In order to study the multiple scattering characteristics of light propagation through clouds, received power was analyzed,the laser transferring process in clouds was simulated with Monte Carlo method, and the waveform broadened temporal signal was obtained. Results illustrate the broadened signal has a steep rise edge followed by an exponential tail, and that the broadened shape is affected by some parameters such as asymmetry factor, clouds thickness, extinction coefficients, receiver field of view, especially strongly by asymmetry factor and clouds thickness.