空间目标可见光散射特性建模方法研究

针对空间目标的可见光散射特性提出一种建模方法.在分析空间目标所处的背景辐射环境基础上建立了空间目标背景辐射物理模型.对目标表面进行面元划分后，基于辐射理论引入双向反射分布函数模型来描述目标表面面元的光散射特性，将目标各个表面所有面元散射分量叠加建立了目标可见光散射特性的数学模型.建立目标本体坐标系，通过坐标变换确定目标、背景辐射源与探测器的相对位置关系，利用矢量坐标法确定目标对观测系统的“可视表面”.根据给定的目标几何结构尺寸和物性参量仿真获得了目标在轨光学特性.计算结果验证了建模的有效性.

Modeling Method for Visible Scattering Properties of Space Target

A modeling method of visible scattering characteristics of space targets was presented.Based on the analysis of background radiation environment of space targets ,a physical model of space targets was established.After the target surface was divided to grids based on the target appearance,Bidirectional Reflection Distribution Function (BRDF) model was used to describe light scattering properties of target surface element according to radiation theory,and a mathematical model on visible scattering properties of the target was built by superimposing all the surface elements scattering components.A body coordinate system was set and the relative positions of the target,the background radiation sources and the detector were determined in terms of coordinate conversion.Visual surfaces of the target to observation system were estiblished by vector coordinate method.Simulation of the target optical characteristics in orbit was achieved according to its given physical dimension and physical parameter.The result shows that the model is valid and it can provide reference data to visible detection and recognition of space targets.