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基于空间目标成像特性的几何模型,引入了区域分解、网格划分的思想,利用双向反射分布函数建立了空间目标红外光谱特性与成像特性的数学模型,给出了目标在探测器入瞳处及像面上的能量分布计算公式。基于目标和探测器的轨道参数,分析了空间目标的成像条件,给出了成像角度和成像尺度判断的数学依据。以风云一号卫星和伽利略卫星为例,根据目标的结构特性、材料特性、轨道特性等确定输入条件,计算获得了目标在探测器入瞳处的辐射照度及目标红外星等随时间的变化关系,同时获得了目标灰度图像随时间的变化特征。仿真结果验证了建模方法的正确性,实现了空间目标红外成像特性的动态模拟。
Based on the geometrical model of spatial target imaging characteristics, the idea of regional decomposition and meshing is introduced. The mathematical model of spatial target infrared spectral characteristics and imaging characteristics is established by using the bidirectional reflection distribution function. Like the surface of the energy distribution calculation formula. Based on the orbit parameters of the target and the detector, the imaging conditions of the space target are analyzed, and the mathematical basis for judging the imaging angle and imaging scale is given. Taking the Fengyun-1 satellite and the Galileo satellite as examples, the input conditions are determined according to the structural characteristics, material properties and orbital characteristics of the target, and the radiation illuminance of the target at the entrance pupil of the detector and the change of the target infrared magnitude with time are calculated At the same time, the change characteristics of the target grayscale image over time are obtained. The simulation results verify the correctness of the modeling method and realize the dynamic simulation of the spatial target infrared imaging.