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Precise orbit determination for BDS-3 GEO satellites enhanced by intersatellite links

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Abstract

Geostationary orbit (GEO) satellites are an integral part of the BeiDou Navigation Satellite System (BDS). Precise orbit determination (POD) for GEO satellites is difficult due to their geostationary characteristics. The orbit determination accuracy that can be achieved based on regional tracking stations in China cannot satisfy high-precision service requirements. The third generation of BDS (BDS-3) is the first global navigation satellite system that synergistically uses regional monitoring stations and global intersatellite links (ISLs) to realize global service. In this study, the quality of ISL data is analyzed based on the residuals of the intersatellite clock offset and the observed-minus-computed residuals of the ISL data. The orbit determination accuracy is assessed based on the observation residuals, the multiday consistency of the ISL time delays, overlapping orbit comparison, the user equivalent range error (UERE), and the accuracy of the clock offset. The results show that the ISL measurement noise for the GEO satellites is 3 cm, and the multiday consistency accuracy of the ISL time delay is better than 0.07 ns. Compared to the satellite-to-ground link (SGL)-based orbit determination method, the root mean square (RMS) three-dimensional (3D) position error of the overlapping orbit differences (OODs) is improved from 1.11 to 0.22 m with the combined SGL- and ISL-based method. Simultaneously, the UERE improves from 0.57 to 0.19 m, and the accuracy of the satellite clock offset improves from 1.09 to 0.61 ns.

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Data availability

Beijing Satellite Navigation Center provides all the test data used in this contribution, including the ISL measurements and the L-band measurements. All data will be made available for scientific research purposes by requesting it from the Beijing Satellite Navigation Center.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos.: 41874043, 41704037, 42004028, and 61603397). We would like to thank the anonymous reviewers for their valuable comments and suggestions, which make our revised manuscript more accurate and clear.

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Correspondence to Xiaogong Hu or Rui Guo.

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Li, X., Hu, X., Guo, R. et al. Precise orbit determination for BDS-3 GEO satellites enhanced by intersatellite links. GPS Solut 27, 8 (2023). https://doi.org/10.1007/s10291-022-01330-3

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