中国空间科学技术

中国空间科学技术 ›› 2021, Vol. 41 ›› Issue (6): 34-41.doi: 10.16708/j.cnki.1000-758X.2021.0079

• 论文 • 上一篇    下一篇

GNSS实时动态授时精度分析

董孝松，孙保琪，杨海彦，韩保民，武美芳，孟令达，杨旭海   

  1. 1山东理工大学 建筑工程学院，淄博255049
    2中国科学院 国家授时中心，西安710600
    3中国科学院 精密导航定位与定时技术重点实验室，西安710600
    4中国科学院大学，北京100049
  • 出版日期:2021-12-25 发布日期:2021-12-15

Accuracy analysis of GNSS real-time kinematic timing

DONG Xiaosong, SUN Baoqi, YANG Haiyan, HAN Baomin, WU Meifang, MENG Lingda, YANG Xuhai   

  1. 1School of Civil and Architectural Engineering, Shandong University of Technology, Zibo 255049, China
    2National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
    3Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences, Xi’an 710600, China
    4University of Chinese Academy of Sciences, Beijing 100049, China
  • Published:2021-12-25 Online:2021-12-15

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摘要： 基于GNSS载波相位观测值的实时动态授时，可有效规避PPP授时对实时精密轨道和钟差产品的依赖问题，对短距离动、静态高精度时间用户具有重要意义。为了更好地验证GNSS实时动态授时性能，基于中国科学院国家授时中心时间频率资源和三个GNSS跟踪站长达2个月的观测数据，以GPS系统为例开展了授时试验。与事后PPP时间传递相比，实时动态授时结果差异STD优于0.15ns；与光纤双向时间传递结果相比，实时动态授时结果差异STD优于0.5ns。试验表明，GNSS实时动态授时精度能够达到亚纳秒量级，可为下一步推广应用提供重要参考。

关键词: 实时动态, 精密授时, GNSS载波相位, 站间单差, 亚纳秒

Abstract: Compared with PPP timing, real-time kinematic timing based on GNSS carrier phase observations can effectively avoid dependence on real-time precise orbit and clock products, and is of great significance to short-distance kinematic and static high-precision time users. In order to verify the performance of GNSS realtime kinematic timing, a timing experiment was carried out with the GPS system as an example based on the time and frequency resources as well as the observation data of three GNSS tracking stations for up to 2 months of the National Time Service Center of the Chinese Academy of Sciences. Compared with the PPP time transfer, the standard deviation of differences from realtime kinematic timing result is better than 0.15ns; compared with the result of optical fiber two-way time transfer, the standard deviation of differences from real-time kinematic timing result is better than 0.5ns. The experiments show that GNSS realtime kinematic timing accuracy can reach the sub-nanosecond level, which can provide an important reference for the future application of this timing technique.

Key words: real-time kinematic, precise timing, GNSS carrier phase, single difference between stations, sub-nanosecond