摘要
IGS的多GNSS实验项目MGEX(Multi-GNSS Experiment)提供的精密钟差产品广泛应用于高精度导航定位领域。本文研究了卫星钟差精度评估的方法,以IGS最终钟差作为GPS卫星基准,以北斗星地双向时间频率传递钟差作为北斗卫星基准,对GFZ、CODE和WHU这3个分析中心的MGEX钟差产品精度进行了分析。研究结果表明:MGEX实验的GPS最终钟差RMS优于0.30 ns;超快速钟差实测部分RMS优于0.16 ns;24 h预报误差RMS优于3.5 ns。各分析中心北斗GEO卫星最终钟差互差RMS为0.75 ns;IGSO卫星为2.27～3.8 ns;MEO卫星为0.6～1.2 ns。北斗星地双向时间频率传递检核GEO卫星最终钟差RMS为2.6～2.7 ns;IGSO和MEO卫星为1～1.5 ns。北斗卫星超快速钟差实测部分RMS优于1 ns;24 h预报误差RMS为7～9 ns。
The precision clock products provided by IGS Multi-GNSS Experiment(MGEX) are widely used in the field of high-precision navigation and positioning. The method of accuracy evaluation is studied for satellite clock bias(SCB). Based on IGS final clock product and the Two-Way Satellite Time and Frequency Transfer(TWSTFT), the accuracy of MGEX final and ultra-fast SCB provided by GFZ, CODE and WHU are analyzed. The results show that the accuracy of GPS final SCB is better than 0.3 ns, 0.16 ns for ultra-fast SCB, and the 24-hour forecast SCB RMS is better than 3.50 ns. The Beidou final SCB difference between three ACs is 0.75 ns, 2.27~3.8 ns, and 0.6 ~ 1.2 ns for GEO, ISGO and MEO satellite respectively. The TWSTFT shows that the final SCB RMS of GEO satellites is 2.6~2.7 ns,1~1.5 ns for that of IGSO and MEO satellites. The accuracy of BeiDou ultra-fast SCB is better than 1 ns, 24 h forecast SCB RMS is 7~9 ns.
作者
杨宇飞
杨元喜
王威
赵昂
YANG Yufei;YANG Yuanxi;WANG Wei;ZHAO Ang(1.Information Engineering University, Zhengzhou 450001, China;Beijing Satellite Navigation Center, Beijing 100094, China;Xi' an Research Institute of Surveying and Mapping, Xi' an 710054, China;National Key Laboratory of Geo-Information Engineering, Xi' an 710054, China)
出处
《测绘科学技术学报》
CSCD
北大核心
2018年第5期441-445,共5页
Journal of Geomatics Science and Technology
基金
国家重点研发计划项目(2016YFB0501700
2016YFB0501701)
国家自然科学基金项目(41374019)
