Abstract
Since 2020, China's Beidou has begun to provide an initial real-time precise point positioning (PPP) service via B2b signals for the Asia–Pacific region. It is expected to be used to achieve centimeter-level positioning and also brings opportunities for real-time time transfer. We collected 29 days of experimental data and compared it with the Centre National d’Etudes Spatiales (CNES) real-time products. The quality of the satellite's orbit and clock was analyzed first. Then, time transfer based on BDS-3, GPS, and BDS-3/GPS PPP was investigated. The results showed that the GPS PPP with the PPP-B2b is not recommended. The time transfer based on BDS-3 PPP using the PPP-B2a is feasible and achieves a 0.30 ns level. Importantly, the reliability of time transfer using the PPP-B2b outperforms that of PPP using CNES products due to the problem of unstable internet communication. Furthermore, compared to BDS-3-only, the precision of time transfer based on BDS-3/GPS PPP was not improved significantly.
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The GNSS data of MGEX are provided by the IGS and can be downloaded through ftp://igs.gnsswhu.cn.
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Acknowledgements
We thank MGEX for providing observations. This work was supported by the National Natural Science Foundation of China (No. 42104014; 42077003; 41904018). Natural Science Foundation of Jiangsu Province (No. BK20201374; BK20190714), Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (21KJB420005), State Key Laboratory of Geodesy and Earth’s Dynamics (SKLGED2022-3-6, SKLGED2022-3-3) and High-level innovation and entrepreneurship talent plan of Jiangsu Province.
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Ge, Y., Cao, X., Lyu, D. et al. An investigation of PPP time transfer via BDS-3 PPP-B2b service. GPS Solut 27, 61 (2023). https://doi.org/10.1007/s10291-023-01402-y
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DOI: https://doi.org/10.1007/s10291-023-01402-y