北斗卫星导航系统精密定轨和广播星历轨道精度分析
首发时间:2015-03-18
摘要:为了分析北斗卫星导航系统导航定位服务能力,本文基于2013年IGS组织M-GEX、Furgo、武汉大学BETS和ILRS等四个跟踪网观测数据,首先进行卫星精密定轨及精度评定,然后采用与事后精密轨道比较、激光检核等方式进行广播星历轨道精度评定,最后分析了广播星历轨道对用户定位的影响。结果表明:基于载波相位观测数据的北斗GEO卫星精密定轨切向分量存在m级的常偏量误差,而基于时间比对和平滑伪距观测数据的广播星历切向分量没有这一现象;北斗卫星精密定轨切向、法向精度分别可以达到0.1m、0.2m;广播星历切向、法向精度分别为0.5m、1m左右,轨道误差URE平均为0.57m。
关键词: GNSS SLR 北斗卫星导航系统 精密定轨 广播星历 导航定位
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Research on Precise and Broadcast Ephemeris Orbit of BeiDou Navigation Satellite System
Abstract:The navigation and position ability of BeiDou Navigation Satellite System is presented using the data collected by IGS M-GEX, Furgo, WHU BETS and ILRS tracking networks. First of all, BDS Precise Orbit Determination is processed and assessed using PANDA software which is developed at the Wuhan University. Then, RMS of broadcast ephemeris orbit is analyzed with different methods, such as comparison with precise orbit, SLR residual, et al. Finally, URE of broadcast ephemeris orbit is discussed. The experiment results show that the along-direction in GEO precise orbit has constant error, the quantity of which is 1-4m; RMS in the radial-direction and cross-direction is 0.1m and 0.2m separately. Meanwhile, the radial-direction and cross-direction in broadcast ephemeris is 0.5m and 1m separately; URE of broadcast ephemeris orbit is 0.57m.
Keywords: GNSS SLR BeiDou Navigation Satellite System Precise Orbit Determination Broadcast Ephemeris Navigation and Position
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