论文部分内容阅读
基于几何光学和辐射理论,研究了空间卫星的可见光散射特性。空间卫星的背景辐射主要包括太阳的直接辐射和地球及大气的散射辐射,根据目标的结构特性与背景特性建立了空间卫星的几何模型和光照模型。分析目标表面状况,入射到目标表面的光线近似服从高次余弦散射分布,根据能量守恒定理及表面材料的高次余弦散射分布特性建立了目标散射特性的数学模型。通过矢量坐标变换确定太阳、地球、观测卫星在目标本体坐标系下的相对位置关系。根据给定的几何尺寸和表面物性参量仿真获得了目标在探测器入瞳处的能量分布及星等特征,目标本体与太阳帆板在探测器入瞳处的辐照度最大量级均为10-12W/m2。仿真结果表明太阳帆板在目标特性分析时不可忽略,为空间目标的可见光探测提供参考数据。
Based on geometric optics and radiation theory, the visible light scattering properties of space satellites are studied. The background radiation of space satellite mainly includes the direct radiation of the sun and the scattered radiation of the earth and the atmosphere. According to the structural characteristics and background characteristics of the target, the geometrical model and the illumination model of the space satellite are established. The target surface condition is analyzed. The light incident on the target surface approximately obeys the cosine scattering distribution, and the mathematical model of the target scattering characteristic is established according to the energy conservation theorem and the cosine scattering distribution of the surface material. The relative position between the sun, the earth and the observing satellite in the target ontology coordinate system is determined by vector coordinate transformation. According to the given geometrical size and surface physical parameters, the energy distribution and the magnitude characteristics of the target at the entrance pupil of the detector are simulated. The maximum irradiance of the target body and the solar panel at the detector entrance pupil is 10 -12W / m2. The simulation results show that the solar panels can not be neglected in the analysis of the target characteristics and provide reference data for the visible light detection of space targets.