卷云散射的蒙特卡罗法模拟  

Numerical Simulation of Cirrus Scattering with the Monte Carlo Method

作　　者：杨春平[1] 贺秀兰[1] 吴健[1] 

机构地区：[1]电子科技大学光电信息学院,成都610054

出　　处：《电子科技大学学报》2009年第1期144-147,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金委-中国工程物理研究院联合基金(10376007)

摘　　要：在对空中目标观测时,高空卷云的散射对目标检测与识别产生了重要影响。鉴于此,该文概述了卷云中规则几何形状冰晶粒子的单次散射计算方法,以及卷云中冰晶粒子的分布情况。对卷云中冰晶粒子的微观物理特性做了进一步探讨,并假设卷云尺度谱遵从Gamma分布,模拟了光波波长0.4～4μm,粒子有效半径为10～120μm的卷云单次散射角与相函数的关系,利用MonteCarlo方法对光子与云滴的碰撞作用后产生多次散射概率进行了建模与仿真。仿真结果表明,卷云的光学厚度随多次散射阶数的增加而增大。While a spatial object is observed by a ground detection system, some important influence of cirrus scattering on the target detection and identification might occur. In this paper, a review of single scattering and distribution properties of regular geometric cirrus particle is given. Micro physical properties are analyzed ulteriorly. Based on an assumption that size distribution of cirrus particles is a Gamma function, the phase function with the scattering angle is simulated within wavelength 0.4 μm to 4 μm and effective radius 10 μm to 120 μm. An approximate model of multiple scattering probability concerning ice crystal particles and photons is proposed. Numerical results show that optical depth of cirrus increases with the order of multiple scattering.

关 键 词：卷云 冰晶粒子 GAMMA分布 蒙特卡罗法 多次散射 

分 类 号：P4-043[天文地球—大气科学及气象学]