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文章全面介绍了太空活动所需时空基准的基本内涵和相互关联, 概述了国内外在时间系统、天球参考 架、行星历表、脉冲星计时等时空基准方面的发展现状, 分析了我国与国外在发展太空活动相关时空基准方 面的差距和原因, 在此基础上提出了发展思路和建议。. In this paper, the connotation of space-time reference and its relationship with space activities are described comprehensively. Time system, celestial reference frame, planetary ephemeris and pulsar timing are outlined. The gap between China and abroad development on space-time reference and its causes are analyzed. At the end, some suggestions for future development in China are proposed. [ABSTRACT FROM AUTHOR]

Taking space-time datum of Global Navigation Satellite Systems as a clue, this paper starts from the basic principle of GNSS (Global Navigation Satellite Systems) and it’s technical realization including space-time relation, orbit and distance measurement, precise timing and time synchronization, expounds the fundamental contribution of Chinese Academy of Sciences (CAS) in precisely measuring and basic supporting for space-time datum which is the most indispensable for BDS (China’s GNSS). [ABSTRACT FROM AUTHOR]