Geopotential determination based on a direct clock comparison using two-way satellite time and frequency transfer
| Autor: | Wen-Bin Shen, Xiao Sun, Chenghui Cai, Kuangchao Wu, Ziyu Shen |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Terrestrial, Atmospheric and Oceanic Sciences, Vol 30, Iss 1, Pp 21-31 (2019) |
| Druh dokumentu: | article |
| ISSN: | 1017-0839 2311-7680 |
| DOI: | 10.3319/TAO.2018.07.09.02 |
| Popis: | According to Einstein’s general relativity theory, a precise (atomic) clock runs faster at a position with higher gravitational potential than a clock at a position with lower potential. Here, we provide a direct clock comparison using a fixed hydrogen clock and a portable hydrogen clock for geopotential determination based on the two-way satellite time and frequency transfer (TWSTFT) technique. After synchronizing the two hydrogen clocks at positions at the same height, the clocks were compared for a height difference of 22 m over a period of 14 days using the TWSTFT technique. Interpretation of the observed time elapse implies a height difference of 175 m +/- 59 m, which matches the frequency stability of our instruments. This study and relevant experiments provide a way of determining the geopotential using ultra-high precise clocks based on the TWSTFT technique in the near future. |
| Databáze: | Directory of Open Access Journals |
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