基于双向反射分布函数的空间卫星紫外动态特性研究

Ultraviolet dynamic characteristics of space satellites based on bidirectional reflection distribution function

根据目标所处的背景辐射环境,对空间卫星的紫外散射特性进行建模方法研究。依据目标表面材料属性与表面状况对目标表面进行区域分解与网格划分。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网格单元的光散射特性,将目标各个表面所有网格单元散射分量叠加建立了目标紫外散射特性的数学模型。利用给定的目标几何结构尺寸和物性参数仿真获得了目标在轨动态光学特性。在某一观测角度下太阳帆板在探测光学系统入瞳产生的辐照度值与卫星本体接近,最大量级为10-11W/m2。仿真结果表明太阳帆板在目标特性分析时不可忽略。

The modeling method of ultraviolet scattering characteristics for space satellites was studied according to background radiation environment. The target surface was divided into regions and each region was divided into grids in view of surface material characteristics and appearance respectively. The bidirectional reflection distribution function （BRDF） model was introduced to describe light scattering properties of target surface grid based on radiation theory, and a mathematical model of ultraviolet scattering properties of the target was built by superimposing scattering components of all the surface grids. The optical dynamic characteristics of the target on its orbit was achieved by using its given physical dimension and parameters. The solar sail irradiance obtained from the entrance pupil of the detector at a certain observation angle is approximately equal to that from the target body, and the maximum magnitude is 10-11 W/m^2. The simulation results indicate the solar sail can not be neglected when the target characteristics is analyzed.