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Initial results of precise orbit and clock determination for COMPASS navigation satellite system

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Abstract

The development of the COMPASS satellite system is introduced, and the regional tracking network and data availability are described. The precise orbit determination strategy of COMPASS satellites is presented. Data of June 2012 are processed. The obtained orbits are evaluated by analysis of post-fit residuals, orbit overlap comparison and SLR (satellite laser ranging) validation. The RMS (root mean square) values of post-fit residuals for one month’s data are smaller than 2.0 cm for ionosphere-free phase measurements and 2.6 m for ionosphere-free code observations. The 48-h orbit overlap comparison shows that the RMS values of differences in the radial component are much smaller than 10 cm and those of the cross-track component are smaller than 20 cm. The SLR validation shows that the overall RMS of observed minus computed residuals is 68.5 cm for G01 and 10.8 cm for I03. The static and kinematic PPP solutions are produced to further evaluate the accuracy of COMPASS orbit and clock products. The static daily COMPASS PPP solutions achieve an accuracy of better than 1 cm in horizontal and 3 cm in vertical. The accuracy of the COMPASS kinematic PPP solutions is within 1–2 cm in the horizontal and 4–7 cm in the vertical. In addition, we find that the COMPASS kinematic solutions are generally better than the GPS ones for the selected location. Furthermore, the COMPASS/GPS combinations significantly improve the accuracy of GPS only PPP solutions. The RMS values are basically smaller than 1 cm in the horizontal components and 3–4 cm in the vertical component.

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Acknowledgments

This work is partially supported by the National Nature Science Foundation of China (Projects 41231174, 41274049), the National “863 Program” of China (Grant No. 2012AA12A202), the “111 Project” of China (Grant No. B07037), and the Open Fund of Key Laboratory of Precision Navigation and Technology, National Time Service Center (Grant No. 2012PNTT06). We would also like to thank Mr. Xiaotao Li for managing data of the CETN stations. The authors are thankful to Dr. X. Liu, who considerably revised the manuscript. Finally, the authors are also grateful for the comments and remarks of three reviewers, which helped to significantly improve the manuscript.

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Correspondence to Jing Guo or Min Li.

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Zhao, Q., Guo, J., Li, M. et al. Initial results of precise orbit and clock determination for COMPASS navigation satellite system. J Geod 87, 475–486 (2013). https://doi.org/10.1007/s00190-013-0622-7

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