Time Transfer via BDS and Galileo Compared to Time Transfer via GPS

K. Liang, Q. Chen, K. Han, Z. Yang, A. Zhang, C. Ding

Abstract:	At present, UTC is generated via TAI corporation with more than 500 atomic clocks at about 80 labs. Each lab participating in TAI corporation keeps one UTC(k). In UTC network, GNSS time transfer link, especially GPS time link, is the most popular for time transfer. For the better reliability, time transfer via other GNSS systems would be the good backup. BDS and Galileo are the newly constructed GNSS systems (in building). Before application of time transfer using other GNSS systems in UTC, the evaluation of time transfer performance should be implemented through comparison to time transfer via GPS and other developed time transfer links such as TWSTFT links. At different sites, some NIM-developed GNSS time transfer receivers (type: NIM-TF-GNSS-3) have been set up and operated for time transfer experiments via GNSS systems, and also some IGS tracking sites only providing Rinex observation files have been involved for the comparison. Signal coverage for BDS and Galileo systems has been evaluated. One software, named RinCGG has been developed to convert Rinex files (version 2 and 3) to CGGTTS files (version 2 and 2e). The performance of RinCGG software has been verified with reference to data generated directly by the GNSS time transfer receivers. BDS and Galileo time transfer have been implemented and their performances are compared with GPS time transfer. In the experiments, B1I and B2I signals in BDS-2 system and E1 and E5a signals in Galileo system have been used for comparison. By CCD experiments, 1 ns stability for BDS and Galileo systems could be acquired. The consistence between the results on the long baselines by BDS and Galileo have been observed.
Published in:	Proceedings of the 50th Annual Precise Time and Time Interval Systems and Applications Meeting January 28 - 31, 2019 Hyatt Regency Reston Reston, Virginia
Pages:	131 - 136
Cite this article:	Liang, K., Chen, Q., Han, K., Yang, Z., Zhang, A., Ding, C., "Time Transfer via BDS and Galileo Compared to Time Transfer via GPS," Proceedings of the 50th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, January 2019, pp. 131-136. https://doi.org/10.33012/2019.16748
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