Abstract
Low earth orbit (LEO) constellation has significant advantages in enhancing the accuracy and integrity of GNSS. Navigation enhancement using LEO satellites has become a hot topic in the field of satellite navigation. The success of self-height accuracy time synchronization is the key to realizing LEO navigation enhancement. The non-difference precise point positioning is applied to LEO navigation enhanced satellite system to achieve high-precision time synchronization of LEO constellation. In this paper, the “scale factor” method is used to model the ionosphere above the orbit altitude of LEO satellite, and other errors such as receiver clock offsets are modeled. The accuracy and convergence rate of time synchronization of LEO satellite with different orbit altitude are analyzed when the ionosphere is not modified or the dual frequency correction is adopted. The results show that the PPP convergence rate of LEO satellite can reach less than 10 min; the influence of ionosphere on the time synchronization accuracy of LEO satellite can be ignored when the orbit altitude is above 850 km; when the orbit altitude is below 850 km, the ionosphere needs to be modified by dual frequency, and the time synchronization accuracy of LEO satellite after correction can reach less than 1 ns.
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Acknowledgments
This study is supported by the ‘National Ministries and Commissions Funded Project’ of China (2019-JCJQ-JJ-190).
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Wang, W., Yu, M., Gong, H., Ma, M., Sun, G. (2021). High Precision Time Synchronization of LEO Constellation Based on PPP. In: Yang, C., Xie, J. (eds) China Satellite Navigation Conference (CSNC 2021) Proceedings. Lecture Notes in Electrical Engineering, vol 774. Springer, Singapore. https://doi.org/10.1007/978-981-16-3146-7_6
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DOI: https://doi.org/10.1007/978-981-16-3146-7_6
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