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Orbit determination, clock estimation and performance evaluation of BDS-3 PPP-B2b service

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Abstract

This paper focuses on PPP-B2b, one of the featured services for BDS-3, which provides users around China with centimetre-level static positioning accuracy and decimetre-level kinematic positioning accuracy by broadcasting precise corrections for GPS/BDS-3 satellites. The GEO PPP-B2b signal broadcasted information types, including the PRN mask, orbit corrections, differential code bias corrections and clock corrections, are introduced, as well as a brief description of their usage. A new orbit determination strategy using regional L-band code/phase measurements and inter-satellite link measurements in combination and a real-time clock estimation strategy based on the Kalman filter for PPP-B2b precise correction generation are introduced in this contribution. Then, the accuracy of the orbit and clock corrections is assessed. The orbit user ranging error (URE) is 0.05 m for the BDS-3 MEO and GPS satellites. The orbit URE for BDS-3 IGSO satellites is worse, i.e., 0.15 m. The clock correction accuracy is 0.2 ns for BDS-3 and GPS satellites. Finally, the PPP-B2b performance is validated by both the static PPP process and simulated kinematic PPP process. BDS-3/GPS dual-system PPP offers faster convergence and better accuracy. The positioning accuracy achievable using PPP-B2b real-time products is at the same level as that using post-processed products. The RMS for BDS-3/GPS dual-system static positioning errors is less than 1.0 cm in east and north and about 3.0 cm in the up. The simulated kinematic positioning accuracy is better than 2.5 cm in the north, 3.5 cm in the east and 8.5 cm in the up directions after convergence.

Highlights

  • A new determination strategy using regional L-band code/phase measurements and inter-satellite link measurements in combination and a real-time clock estimation strategy based on the Kalman filter for PPP-B2b precise correction generation are introduced.

  • User ranging error (URE) is 0.05 m for the BDS-3 MEO and GPS satellites.

  • The clock correction accuracy is 0.2 ns for BDS-3 and GPS satellites.

  • The positioning accuracy achievable using PPP-B2b real-time products is at the same level as that using post-processed products.

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Acknowledgements

This research is funded by National Key Research and Development Program of China (2016YFB0501405) and National Natural Science Foundation of China (Grant No. 41804030, 41874039, 41874043, 41574029 and 41674041).

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Authors and Affiliations

  1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China

    Chengpan Tang, Xiaogong Hu, Shanshi Zhou, Xiaojie Li, Jinhuo Liu & Jianhua Yang

  2. Beijing Satellite Navigation Center, Beijing, 100094, China

    Jinping Chen, Li Liu, Rui Guo & Xiaojie Li

  3. Shanghai Key Laboratory for Space Positioning and Navigation, Shanghai, 200030, China

    Xiaogong Hu

  4. University of Chinese Academy of Sciences, Beijing, 100049, China

    Jinhuo Liu & Jianhua Yang

  5. National Defense University, No. 3 Hongsankoujia Road, Beijing, 100091, China

    Feng He

Authors
  1. Chengpan Tang
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  2. Xiaogong Hu
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  3. Jinping Chen
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  4. Li Liu
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  9. Jinhuo Liu
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Contributions

XH and JC provided the initial idea for this study. CT and XH wrote the article. CT and LL developed the real-time clock estimation software and conducted the experiments. SZ and RG conducted the inter-satellite link enhanced orbit determination experiments. XL and Feng He analysed the information type of PPP-B2b message. Jianhua Yang evaluated orbit and clock accuracy. JL conducted the precise point positioning experiments.

Corresponding author

Correspondence to Xiaogong Hu.

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The authors declare that they have no conflict of interest.

Data availability

The PPP-B2b broadcast message can be obtained with a customized receiver following the public PPP-B2b ICD of BDS-3. Measurements of iGMAS stations for evaluation can be obtained via application. The GFZ products can be download from the IGS website.

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Tang, C., Hu, X., Chen, J. et al. Orbit determination, clock estimation and performance evaluation of BDS-3 PPP-B2b service. J Geod 96, 60 (2022). https://doi.org/10.1007/s00190-022-01642-9

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