Potentiality of Multi-GNSS precise point positioning time transfer with ambiguity resolution in determining gravity potential
- 1Time and Frequency Geodesy Center, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. (whuxwei@whu.edu.cn, wbshen@sgg.whu.edu.cn, sggllh@whu.edu.cn, lwangsgg@whu.edu.cn, ningan2016@whu.edu.cn)
- 2State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China.
- 3School of Resource, Environmental Science and Engineering, Hubei University of Science and Technology, Xianning, Hubei, China. (theorhythm@foxmail.com)
In this study the time transfer algorithms of the precise point positioning (PPP) and integer PPP (IPPP) are extended to Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), BeiDou Navigation Satellite System (BDS) and Galileo Navigation Satellite System (Galileo). Taking BRUX-OPMT, BRUX-PTB, BRUX-WTZR, and BRUX-CEBR four-time links as an example, the performances of the PPP and the IPPP time transfer of the GPS, BDS, Galileo and GLONASS systems are compared and analyzed. The results show that the performances of GPS and Galileo are better than those of BDS and GLONASS. With an ambiguity resolution, the frequency instability in time transfer can reach sub 10-16 level after five days. Compared with the PPP solutions, the long-term frequency stability of IPPP is improved by above 15% on average. If the frequency instability of the clock reaches 1 × 10-18, an equivalent altitude difference of 1.0 cm can be sensed with the help of the PPP or IPPP time transfer technique. High-precision GNSS time transfer methods, especially the IPPP time transfer techniques with their advantages in long-term stability, will provide prospective applications for determining the gravity potential, measuring height, and unifying the world height system. This study is supported by the National Natural Science Foundations of China (NSFC) under Grants 42030105, 41721003, 41804012, 41631072, 41874023, Space Station Project (2020)228, and the Natural Science Foundation of Hubei Province of China under Grant 2019CFB611.
Keywords Multi-GNSS PPP Ambiguity resolution Time transfer Gravity potential
How to cite: Xu, W., Shen, W., Li, L., Wang, L., Ning, A., and Shen, Z.: Potentiality of Multi-GNSS precise point positioning time transfer with ambiguity resolution in determining gravity potential, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1402, https://doi.org/10.5194/egusphere-egu22-1402, 2022.