复杂目标光学散射截面数值仿真方法

研究复杂目标的几何建模、光学面元消隐和目标表面的光学散射特性.针对任意构型的目标，提出采用均匀光照明仿真图像进行光学散射截面（OCS）数值计算方法.通过自适应Z缓存方法，实现目标光学消隐面的计算，将这部分消隐面面积从目标OCS的数值积分中去除.研究近似镜面材料的空间模板褶皱表面的光学散射数值模拟方法，以及基于激光主动探测系统实验测量数据的目标OCS实验分析方法.根据某缩比例空间目标相对探测系统不同方位、俯仰角情况的OCS实验结果，校正OCS数值仿真参数.仿真结果与实验结果的图像比较和OCS曲线趋势大略一致，考虑到表面褶皱的随机性、姿态的测量误差和仿真模型有限的校准能力等因素，本文提出的数值仿真方法能够在一定程度上描述目标的OCS值.

Numerical Simulation on Optical Cross Section of Complex Targets

Numerical simulation on optical cross section (OCS) of complex targets is shown.An adaptive Z buffer method is discussed.Optical hidden facets are processed precisely and subtracted from integral OCS.Optical scattering characteristics described by bidirectional reflectance distribution function (BRDF) are used in numerical simulation.For surface pleats of space targets with grass-like optical scattering characteristics, normal vector model of pleat and scattering model are analyzed.An analysis for OCS experimental evaluation is given.OCS for a downsizing space target with different azimuth and zenith angle attitudes are achieved.Simulation parameters for downsizing target are calibrated with experimental results.Simulation images and trendlines are coherent with experiment results roughly, which indicates that the method describes OCS at a certain extent.