基于区域监测站的BDS定轨策略分析

Analysis of Strategy of BDS Satellite Orbit Determination using Regional Monitoring Stations

围绕影响轨道精度和实时性的5个要素(模糊度分类固定、测站数量、定轨弧长、太阳光压模型和多系统组合)展开研究,得出区域测站分布下的定轨优选策略。实验表明,选取中国区域27个均匀分布的地面区域监测站,利用72h弧长观测数据,采用ECOM 5参数简化太阳光压摄动模型、BDS/GPS双系统联合定轨可达到较好的精度,其中GEO卫星轨道精度约291cm,IGSO/MEO卫星轨道精度优于11cm。若BDS单系统采用上述策略进行定轨,也可达到GEO卫星299cm和IGSO/MEO卫星14.4cm的近似等价定轨精度。

This paper focusses on the five factors that affect the accuracy and timeliness of orbits, in- cluding the ambiguity fixed of different types of satellites, the number of regional ground monitoring stations, the length of the observation data arc, the selection of solar pressure perturbation model and multi-system combination orbit determination, and analyzes the optimal strategy of orbit determina- tion under regional station distribution. The experimental results show that selecting 27 uniformly distributed ground area monitoring stations in China, using 72 h arc length of the BDS/GPS multi-sys- tem observation data, and adopting the ECOM 5 parameters model of the solar pressure perturbation, can achieve better orbit accuracy. The accuracy of the GEO satellite orbit is about 291 cm, and the accuracy of the IGSO/MEO satellite is better than 11 cm. If the above strategy is used for BDS single system orbit determina- tion, GEO satellite 299 cm and IGSO/MEO satellite 14.4cm orbit accuracy can be achieved.