卫星网联合定轨的多结构非线性参数建模及精度仿真

Multi-structural Non-linear Parameters Modeling of Satellite-network Combined Orbit Determination and Orbit Determination Precision Simulation

基于双星定位系统的多近地卫星的联合定轨,实际上属于多结构多参数非线性回归模型及其参数估计方法研究的范畴。据此建立了基于双星定位系统的近地卫星网联合定轨的多结构非线性回归模型,通过引入加权因子讨论定轨模型的加权与参数估计问题,设计了卫星网联合定轨的多结构非线性回归模型的最优加权算法,并进行了两类仿真实验。仿真计算结果表明,基于最优加权的多结构非线性联合定轨建模方法及实现算法能够有效改善联合定轨精度,从实践角度证明了该建模方法的应用价值。

Multi-LEO combined orbit determination （COD） based on bi-satellite positioning system （BPS） belongs to category of multi-structural non-linear regressive models and parameters estimation methods. This paper constructs multi-structural non-linear COD models of low earth orbit（LEO） satellitenetwork, and discusses regressive models weighting and parameters estimation by introducing weighting factor. Then it designs the COD algorithm of satellite-network based on numerical fusion algorithm and ranging system error parameters estimation algorithm which are put forward by us in former researches, and carries out two kinds of simulation experiments. Simulation computation results show that multistructural non-linear precise orbit determination modeling method and its algorithm based on optimal weight can ameliorate COD precision, which proves applied value of the modeling method we bring forward from practical angle.