Volume 38 Issue 4
Jul.  2018
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CHANG Zhiqiao, HU Xiaogong, SHI Xin, LI Jin, MA Yongbo, DONG Wenli, SHAO Jia'ni. Accuracy Analysis of Satellites Velocity with BDS Broadcast Ephemeris Based on Position Observationsormalsize[J]. Journal of Space Science, 2018, 38(4): 553-559. doi: 10.11728/cjss2018.04.553
Citation: CHANG Zhiqiao, HU Xiaogong, SHI Xin, LI Jin, MA Yongbo, DONG Wenli, SHAO Jia'ni. Accuracy Analysis of Satellites Velocity with BDS Broadcast Ephemeris Based on Position Observationsormalsize[J]. Journal of Space Science, 2018, 38(4): 553-559. doi: 10.11728/cjss2018.04.553

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

doi: 10.11728/cjss2018.04.553
  • Received Date: 2017-04-18
  • Rev Recd Date: 2017-12-21
  • Publish Date: 2018-07-15
  • 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.

     

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