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Test of determining geopotential difference by precise point position time-frequency transfer using hydrogen masers

Authors

Wang,  Lei
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shen,  Wen-Bin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Xu,  Wei
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Li,  Li-Hong
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Pengfei
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ning,  An
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Xu,  Rui
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Cheng,  Peng
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shen,  Ziyu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Wang, L., Shen, W.-B., Xu, W., Li, L.-H., Zhang, P., Ning, A., Xu, R., Cheng, P., Shen, Z. (2023): Test of determining geopotential difference by precise point position time-frequency transfer using hydrogen masers, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3150


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020586
Abstract
According to general relativity theory, the geopotential difference can be determined by comparing the clocks’ vibration frequencies or running rates. We conducted experiments to determine the geopotential difference between two remote sites with a height difference of about 1,245 m using two sets of hydrogen maser systems via precise point position time-frequency transfer technique. Two equipment sets were installed at one site or two remote sites to form the local or remote time-frequency transfer link. The gravity frequency shift between two hydrogen masers at two remote sites is derived from the resolved clock offset series, taking into account the local time-frequency transfer link as calibration. Then the geopotential difference is determined as 12,142.3 (112.4) m2/s2, quite close to the value 12,153.3 (2.3) m2/s2 computed by the EIGEN-6C4 model. Results show that the method proposed here for determining geopotential difference is promising for broad applications. This study is supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 42030105, 41721003, 42274011), Space Station Project (2020)228, and Fundamental Research Funds for the Central Universities (2022).