Orbit Accuracy Analysis for BeiDou Regional Tracing Network

• 作 者: GangZhao;ShanshiZhou;XuhuaZhou;BinWu;
• 机 构: Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
• 出 处: 第七届中国卫星导航学术年会
• 发表日期: 2016年期

　　In order to evaluate the orbit accuracy of regional network of Chinese BeiDou Satellite Navigation System (BDS),we compare the orbits determined by regional network consisting of ground stations within the border of China and orbits provided by global Multi-GNSS Experiment (MGEX) covering two-year time span from 2013 to 2014.The results show,for GEO/IGSO/MEO,mean radial accuracies of regional-network orbits are around 0.4m,0.3m and 0.2m,respectively.The orbit accuracy degenerates significantly during eclipse and IGSO/MEO yaw-fixing season.IGSO/MEO orbit accuracies present possible quasi-periodic oscilla-tion,but show week correlation with suns elevations above the orbital plane.Assessment of regional-network orbits by satellite laser ranging (SLR) shows,for GEO/IGSO/MEO,the RMS of station-satellite distance are around 0.6m,0.3m and 0.2m,respectively,which match the orbit radial errors fairly well but contain significant systematic offsets.The characteristics presented in BeiDou satellites are quite different from those in GPS/Galileo.The dynamic modeling accuracy and orbit processing strategy on BeiDou satellites need further enhancement.