空间信号误差对北斗单向授时的影响  

Impact of signal-in-space error on Beidou one-way timing

作　　者：李丹丹[1,2,3] 许龙霞[1,2] 李博 李孝辉[1,2] 

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院精密导航定位与定时技术重点实验室,西安710600 [3]中国科学院大学,北京10049

出　　处：《电子测量与仪器学报》2017年第10期1673-1678,共6页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(11503030);国防创新基金面上项目(CXJJ-16M205)资助

摘　　要：北斗卫星广播星历是影响授时服务的主要误差源,分析它的精度是非常必要的。分析了空间信号误差的主要组成星历误差和星钟误差的计算方法,并阐述了计算过程中应注意的问题:参考时间尺度不一致、坐标系不一致和卫星位置参考点不一致。以IGS分析中心GFZ提供的事后精密星历为参考,利用北斗卫星广播星历分析了空间信号误差对北斗单向授时的影响。结果表明,空间信号误差对北斗单向授时的影响随机波动在7 ns以内,由于不同北斗卫星对应的星钟误差中存在大小不等的系统误差,导致星钟误差对单向授时结果的影响大于星历误差。Beidou satellite broadcast ephemeris is the main error source of timing service, and it is necessary to analyze its precision. The calculation method of signal-in-space is analyzed mainly considering satellite ephemeris and satellite clock error. The care must be taken is that when using the BeiDou satellite broadcast ephemeris and precise ephemeris/clocks the reference time scale is atypsim, the coordinate system is atypsim, and the reference point of satellite position is atypsim. The impact of signal-in-space error on one-way timing is analyzed with IGS final precise ephemeris for reference. According to the results, the random fluctuation of the impact of signal- in-space error on one-way timing is within 7 ns. And the impact of satellite clock error is relatively larger than that of satellite ephemeris error because there are different system errors corresponding to each BeiDou satellite＇ s clock error.

关 键 词：北斗卫星导航系统 空间信号误差 星历误差 星钟误差 单向授时 

分 类 号：TH762[机械工程—仪器科学与技术]