Journal of Astronautics ›› 2015, Vol. 36 ›› Issue (4): 470-476.doi: 10.3873/j.issn.1000-1328.2015.04.014

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Effects of Relativity in Autonomous Time Reference for Navigation Constellation

LIU Li li, WANG Yue ke, CHEN Jian yun, ZHOU Yong bin   

  1. College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China
  • Received:2014-02-25 Revised:2014-06-24 Online:2015-04-15 Published:2015-04-25

Abstract:

Beginning with the definition of autonomous time reference and its generation principle, the relativistic effects on the essential factors including satellite clock relativity and crosslink measurements relativity are analyzed in this paper, and calculated by taking GPS and BDS constellations for examples. The following conclusions are reached: 1) the satellite clock relativity effect has a constant part and a periodic part, and the constant part is compensated by terrestrial frequency adjustment, while the periodic clock error is corrected in real time according to the ephemeris; on the basis of the adjustment of the satellite clock, 2) the crosslink pseudo-range (PR) measurement relativity effect between satellites inview is mainly the relativity effect on the light time delay, and can reach cm-level for medium and high orbits satellite; 3) the crosslink Doppler measurement relativity effect is due to the period part of clock frequency offset, and its effect on radial velocity is around 1cm/s for medium and high orbits satellite with small eccentricity. The above-mentioned analyses can help to improve the accuracy of autonomous time reference, and provide certain reference significance for the research of deep-space measurement and space-based time reference establishment.

Key words: Autonomous time reference, Relativity effect , Time-scale, Crosslink measurement

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