Abstract:In this paper, based on kinematic method and reduced-dynamic method, using on-board GPS observation data, the precise orbits of SWARM are implemented. The orbit accuracy is assessed using the post-scientific orbit released by ESA. The results show that the seven-day average RMS values of radial, along-track and cross-track directions of kinematic orbits are all less than 3 cm, and the accuracy of orbit determination reaches the centimeter level. The radial RMS of reduced-dynamic orbits is about 0.65 cm and the along-track and cross-track directions are about 1.3 cm, which are better than expected. In addition, the fast orbital precision of SWARM, based on fast ephemeris released by IGS, is approximately equal to that of precise orbit determination. However, in the near real-time orbit determination of SWARM satellite, the 3D-RMS of kinematic orbit determined by ultra-fast ephemeris is 9.68 cm, and the 3D-RMS of reduced-dynamic orbit is 3.61 cm. The accuracy of the orbit is lower than the fast ephemeris results.
XIA Yaowei,GUO Jinyun,LIU Lu et al. Precise Orbit Determination Research of SWARM Satellites Based on Kinematic and Reduced-Dynamic Methods[J]. jgg, 2019, 39(4): 392-398.