广域增强系统广播星历模型分析

Broadcast ephemeris model analysis of wide area argumentation system

针对广域增强系统10参数广播星历模型的应用范围与应用性能问题,该文提出了综合参数动力学含义和拟合精度的模型分析方法。以GPS 16参数模型为参照对象,采用轨道坐标系3方向投影法,对10参数和16参数模型的摄动表达机理进行了研究。基于GEO、IGSO和MEO 3种卫星实际数据,通过长弧和短弧条件下的拟合精度分析,完成了10参数模型应用性能的全面评估。实验结果表明:10参数模型在长弧条件下的拟合性能不佳,4min弧长条件下,3种卫星拟合精度均能够满足基本导航、在航飞行与精密进近等应用需求。所提方法解决了10参数模型从GEO卫星向其他类型卫星的拓展问题。

In this paper, for the problem of application range and application performance of 10-pafainter in wide area augmentation system, a method combined by parameter dynamic meaning and fitting accuracy was proposed. With the reference object of 16-paramter in GPS, the method of three-direction rejection in orbital coordinate system was adopted to study the perturbation expression mechanism of the models of 10-parameter and 16-parameter. Based on the real data of GEO, IGSO and MEO, the comprehensive evaluation of application performance of the 10-paramter model was completed through the fitting accuracy analysis on the condition of long-arc and short-arc. According to the experiment result, 10-parameter model had a bad fitting accuracy performance on the condition of long-arc, while the fitting accuracy can completely satisfied the application requirements of basic navigation, en-route and precision approach for the three types of satellites on the condition of 4-minute-arc. The method in this paper solved the expansion problem of 10-parameter model from GEO to some other satellites.