天基观测目标卫星光度特性分析

从辐射理论出发,推导出两种卫星基本漫反射表面(柱体和平板)的辐射照度计算公式;基于J2000.0地心赤道惯性坐标系,分析了天基观测时太阳、目标卫星和观测卫星的位置矢量坐标,并进一步求出了它们之间的角度和距离关系,通过仿真算出了一定观测时间内目标卫星的视星等。仿真计算表明,天基观测由于不受地球曲率影响,且观测几何拉开,太阳相位角、观测距离变化范围较大,因此目标卫星视星等变化范围较大。

Analysis of Luminosity Features of Satellites on Space-based Surveillance

Based on radiation theory,radiation luminescence calculation formula of the two basic diffuse reflection surfaces of satellites are derived.Their practical values can be calculated from the relative position vector relation,angle and distance of the sun,target satellite and observation satellite in J2000 equatorial coordinate system.Theoretical calculation shows that the sun phase angle,observation distance and the brightness magnitude of the targeted satellite change significantly because of no earth curvature effect and large separation distance in position.