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Precise orbit determination for BDS3 experimental satellites using iGMAS and MGEX tracking networks

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Abstract

In this contribution, we focus on the precise orbit determination (POD) for BDS3 experimental satellites with the international GNSS Monitoring and Assessment System (iGMAS) and Multi-GNSS Experiment (MGEX) tracking networks. The datasets of DOY (day of year) 001-230 in 2017 are analyzed with different processing strategies. By comparing receiver clock biases and receiver B1I–B3I DCBs, it is confirmed that there is no obvious systematic bias between experimental BDS3 and BDS2 in the common B1I and B3I signals, which indicates that experimental BDS3 and BDS2 can be treated as one system when performing combined POD. With iGMAS-only BDS3 stations, the 24-h overlap RMS of \(\hbox {BDS}3\,+\,\hbox {BDS}2\,+\,\hbox {GPS}\) combined POD is 24.3, 16.1 and 8.4 cm in along-track, cross-track and radial components, which is better than BDS3-only POD by 80–90% and better than \(\hbox {BDS}3+\hbox {BDS}2\) combined POD by about 10%. With more stations (totally 20 stations from both iGMAS and MGEX) and the proper ambiguity resolution strategy (GEO ambiguities are float and BDS3 ambiguities are fixed), the performance of BDS3 POD can be further improved to 14.6, 7.9 and 3.7 cm, respectively, in along-track, cross-track and radial components, which is comparable to the performance of BDS2 POD. The 230-day SLR validations of C32, C33 and C34 show that the mean differences of \(-\,3.48\), 7.81 and 8.19 cm can be achieved, while the STD is 13.35, 13.46 and 13.11 cm, respectively. Furthermore, the 230-day overlap comparisons reveal that C31 most likely still uses an orbit-normal mode and exhibits similar orbit modeling problems in orbit-normal periods as found in most of the BDS2 satellites.

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Acknowledgements

We are grateful to iGMAS and IGS-MGEX for providing multi-GNSS data and products. Thanks also go to the EPOS-RT/PANDA software provided by GFZ. This study was financially supported by the National Natural Science Foundation of China (Grant No. 41774030).

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Authors and Affiliations

  1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, Hubei, China

    Xingxing Li, Yongqiang Yuan, Yiting Zhu, Jiande Huang, Jiaqi Wu, Yun Xiong, Xiaohong Zhang & Xin Li

  2. German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473, Potsdam, Germany

    Xingxing Li

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  1. Xingxing Li
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Correspondence to Xingxing Li.

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Li, X., Yuan, Y., Zhu, Y. et al. Precise orbit determination for BDS3 experimental satellites using iGMAS and MGEX tracking networks. J Geod 93, 103–117 (2019). https://doi.org/10.1007/s00190-018-1144-0

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