空间目标观测辐照度特性建模及仿真

The modeling and simulation of observational irradiance characteristics of space object

为提高对空间目标的探测与识别能力,从电磁散射理论出发,利用基尔霍夫近似法及双向反射分布函数,求出目标面元的辐射亮度,结合空间目标几何外形分析目标的散射特性,从而建立空间目标在天基空间观测系统入瞳处的观测辐照度模型。通过典型实例,仿真分析了某空间目标相对于某天基观测系统的最佳观测部位和弧段。研究结果表明,该方法能够有效地描述空间目标的观测辐照度特性,从而为观测系统性能研究提供数据支持。

For improving the capability of space object in detecting and identifying,based on the theory of electromagnetism scattering,the diffusion signature of the object facets is calculated by using Kirchhoff approach and bidirectional reflectance distribution function（BRDF）.Combined with the characteristics of object shape,the irradiance model of space object which is in the camera lens of the space-based observation system is built.Furthermore,the best part of space object and the optimal observational time are simulated and calculated by the representative example.According to the analysis of the simulation result,the method not only can describe observational irradiance characteristics of space object efficiently,but also offer the data for the research of observation system.