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Chinese Journal of Space Science ›› 2018, Vol. 38 ›› Issue (4): 553-559.doi: 10.11728/cjss2018.04.553

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Accuracy Analysis of Satellites Velocity with BDS Broadcast Ephemeris Based on Position Observationsormalsize

CHANG Zhiqiao1, HU Xiaogong2, SHI Xin1, LI Jin1, MA Yongbo1, DONG Wenli2, SHAO Jia'ni1   

  1. 1. Beijing Satellite Navigation Center, Beijing 100094;
    2. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030
  • Received:2017-04-18 Revised:2017-12-21 Online:2018-07-15 Published:2018-07-16

Abstract:

Using broadcast ephemeris to calculate the velocity vector of navigation satellites is a necessary condition for GNSS real-time velocity determination. In this paper, the accuracy of velocity vector calculated by Beidou broadcasting ephemeris only with position observations is analyzed, and the calculation formula of velocity vector with Beidou 18-element model is deduced. Based on one year data of 13 Beidou satellites in orbit, the accuracy of velocity vector calculated by broadcasting ephemeris is obtained. The results show that the maximal velocity error calculated by the 18-element model is in the order of 10-4-1. At the same fitting period, the velocity accuracy of GEO and IGSO satellites is higher than that of MEO. By analyzing position residual sequence, the conclusion is drawn that the velocity accuracy computed by broadcast ephemeris is very high because of little position residual with smooth change trend. The analysis and calculation results in this paper verify the effectiveness of fitting BDS broadcast ephemeris only using position observations.

Key words: BDS (BeiDou Navigation Satellite System), Broadcast ephemeris, 18-element model, Position, Velocity

CLC Number: