COMPASS time synchronization and dissemination—Toward centimetre positioning accuracy

作     者：WANG ZhengBo ZHAO Lu WANG ShiGuang ZHANG JianWei WANG Bo WANG LiJun 

作者机构：NIM-THU Joint Institute for Measurement Science(JMI) Tsinghua University Department of Physics Tsinghua University Department of Applied Physics School of Physics and Nuclear Energy Engineering Beihang University Department of Precision Instruments & Mechanology Tsinghua University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2014年第57卷第9期

页      面：1788-1804页

核心收录：

学科分类：08[工学] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 

基　　金：supported by the Ministry of Science and Technology of China(Grant No.2010CB922901) Tsinghua University under its Scientific Research Initiative Program(Grant No.20091081474) a special research fund from the National Institute of Metrology of China(NIM) 

主　　题：GNSS time and frequency Global Navigation Satellite System GNSS time synchronization time dissemination atomic clock phase locked loop relativity Geo-stationary satellites reference system 

摘      要：In this paper we investigate methods to achieve highly accurate time synchronization among the satellites of the COMPASS global navigation satellite system(GNSS).Owing to the special design of COMPASS which implements several geo-stationary satellites(GEO),time synchronization can be highly accurate via microwave links between ground stations to the GEO *** as space-borne relay stations,the GEO satellites can further disseminate time and frequency signals to other satellites such as the inclined geo-synchronous(IGSO)and mid-earth orbit(MEO)satellites within the *** is shown that,because of the accuracy in clock synchronization,the theoretical accuracy of COMPASS positioning and navigation will surpass that of the *** addition,the COMPASS system can function with its entire positioning,navigation,and time-dissemination services even without the ground link,thus making it much more robust and *** further show that time dissemination using the COMPASS-GEO satellites to earth-fixed stations can achieve very high accuracy,to reach 100 ps in time dissemination and 3 cm in positioning accuracy,*** this paper,we also analyze two feasible synchronization *** special and general relativistic effects related to COMPASS clocks frequency and time shifts are *** conclude that COMPASS can reach centimeter-level positioning accuracy and discuss potential applications.