According to General Relativity Theory(GRT),by comparing the frequencies between two precise clocks at two different stations,the gravity potential(geopotential)difference between the two stations can be determined du...According to General Relativity Theory(GRT),by comparing the frequencies between two precise clocks at two different stations,the gravity potential(geopotential)difference between the two stations can be determined due to the gravity frequency shift effect.Here,we conduct a clock-transportation experiment for measuring geopotential differences based on frequency comparisons via satellite links between two remote hydrogen atomic clocks.Based on the net frequency shift between the two clocks in two different periods,the geopotential difference between stations of the Beijing 203 Institute Laboratory(BIL)and Luojiashan Time-frequency Station(LTS)is determined.Comparisons show that the experimental result deviated from the reference of Earth gravity model EGM2008 result by(38.5�45.9)m in Orthometric Height(OH).The results are consistent with the frequency stabilities of the hydrogen clocks(at the level of 1015)used in the experiment.With the rapid development of time and frequency science and technology,the approach discussed in this study for measuring the geopotential is prospective and thus,could have broad applications.展开更多
基金supported by the National Natural Science Foundations of China[grant numbers 42030105,41721003,42274011]the Fundamental Research Funds for the Central Universities[grant number 2042022kf0003]the Space Station Project[grant number 2020-228].
文摘According to General Relativity Theory(GRT),by comparing the frequencies between two precise clocks at two different stations,the gravity potential(geopotential)difference between the two stations can be determined due to the gravity frequency shift effect.Here,we conduct a clock-transportation experiment for measuring geopotential differences based on frequency comparisons via satellite links between two remote hydrogen atomic clocks.Based on the net frequency shift between the two clocks in two different periods,the geopotential difference between stations of the Beijing 203 Institute Laboratory(BIL)and Luojiashan Time-frequency Station(LTS)is determined.Comparisons show that the experimental result deviated from the reference of Earth gravity model EGM2008 result by(38.5�45.9)m in Orthometric Height(OH).The results are consistent with the frequency stabilities of the hydrogen clocks(at the level of 1015)used in the experiment.With the rapid development of time and frequency science and technology,the approach discussed in this study for measuring the geopotential is prospective and thus,could have broad applications.
