基于iGMAS的BDS广播星历一致性分析

Analysis on BDS Broadcast Ephemeris Consistency Based on iGMAS

全球连续监测评估系统(international GNSS Monitoring&Assessment System,iGMAS)是对全球卫星导航系统(Global Navigation Satellite System,GNSS)的运行状况和主要性能指标进行监测和评估,并生成高精度精密星历和卫星钟差等产品的信息平台。在GNSS监测评估中,广播星历一致性是一项重要指标,直接影响着定位精度。基于iGMAS提供的广播星历,对北斗导航系统(Bei Dou Navigation Satellite System,BDS)的广播星历的轨道和钟差一致性指标进行分析评估。实验结果表明,广播星历的轨道与钟差误差分别达到cm级与ns级。

The international GNSS Monitoring and Assessment System （ iGMAS） is an information platform for monitoring andassessing the operational status and major performance indicators of the Global Navigation Satellite System （ GNSS） and generating the high precision ephemeris and satellite clocks. In GNSS monitoring and assessment,the broadcast ephemeris consistency is an important index,which directly affects the positioning accuracy. Based on the broadcasting ephemeris from iGMAS, this paper analyzes and evaluates the track and clock consistency index of broadcast ephemeris of BeiDou Navigation Satellite System （BDS） . The experimental results show that the orbit and clock error of broadcast ephemeris reach centimeters level and nanoseconds level,respectively.