Journal of Astronautics ›› 2015, Vol. 36 ›› Issue (4): 477-482.doi: 10.3873/j.issn.1000-1328.2015.04.015

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A Novel Submeter Level Real Time Orbit Determination Algorithm Based on Space Borne GPS Pseudorange Measurements

GONG Xue wen, WANG Fu hong   

  1. School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China
  • Received:2014-03-19 Revised:2014-05-16 Online:2015-04-15 Published:2015-04-25


A novel real-time orbit determination method based on GPS pseudorange measurements is presented in this paper. In this method, the GPS pseudorange measurements are taken as basic observations, corresponding parameters in the Kalman filter model are set to absorb the errors of broadcast orbits and clocks, thus achieving sub-meter level orbit results. Then a simulative test is carried out to process the space-borne GPS dual frequency pseudo-range data of GRACE-A by using broadcast ephemeris with the auto-developed software SATODS. The test demonstrates that the position and velocity error (3DRMS) of orbit results are reduced to 0.4~0.6 m and 0.4~0.6 mm/s respectively, which means orbital accuracies are improved by 40% compared with the traditional method.

Key words: Pseudorange, Space-borne GPS, Real-time orbit determination, Submeter-level

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