针对导航卫星自主运行低功耗、高精度的需求,在综合考虑卫星本身物理性质和光压产生机理的基础上,提出一种适用于卫星自主运行时在轨计算的光压模型.利用精密星历反解太阳光压模型参数的方法,分析三种典型光压模型的参数特性及其精度.通过对轨道拟合和轨道预报的精度分析比较,在传统球模型的基础上,提出一种3参数的改进球模型.以GPS卫星为例的仿真结果表明,改进球模型以3个待估参数达到Bern模型(9参数)短期轨道预报精度的80%,其长期轨道预报精度也呈现出较好的特性,模型性能满足卫星自主运行的需求.%In order to satisfy the needs of low consumption and high precision of autonomous navigation, it puts forward an enhanced sphere model that is suitable for on-orbit computa-tion, which takes into account both the physical features of satellites and mechanism of solar radiation pressure come into being. Used precise ephemeris as a solution to inverse calculate the SRP parameters, and analyzed parameters characters and precision of three typical SRP models. Through comparison and analysis of precision of orbit fit and orbit prediction, it comes up with an enhanced sphere model, which only have 3 parameters. The results, which taken GPS satellites for example, indicate that the enhanced sphere model, which only have three parameters, can reach 80% short-period orbit prediction precision of Bern model(9 parameters) and performance well in long-period orbit prediction, whose performance can reach the requirement of satellites autonomous navigation.
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