摘要
General relativity theory(GRT)concludes that a precise clock ticks at different running rates if it is under the influence of different geopotentials.Therefore,by comparing the running rates of clocks at arbitrary two stations,the geopotential difference between them can be determined.In this study,with the help of two hydrogen atomic clocks(noted as H-masers),using the two-way satellite time and frequency transfer(TWSTFT)technique,we carried out experiments of the geopotential difference determination at the China Aerospace Science&Industry Corporation(CASIC),Beijing.Here the ensemble empirical mode decomposition(EEMD)method is adopted to remove periodic signals included in the original observations.Finally,the clock-comparison-determined geopotential difference in the experiments is determined.Results show that the difference between the geopotential difference determined by GRT and that determined by measuring tape is about 1316.1±931.0 m2s-2,which is equivalent to 134.3±95.0 m in height,and in consistence with the stability of the H-masers applied in the experiments(at the level of10-15/day).With the rapid improvement of atomic clocks’accuracy,the geopotential determination by accurate clocks is prospective,and it is promising to realize the unification of the world vertical height system(WVHS).
基金
supported by National Natural Science Foundation of China(NSFC)(grant Nos.41721003,41631072,41874023,41804012,41429401,41574007)
Natural Science Foundation of Hubei Province(grant No.2019CFB611)
作者简介
Kuangchao Wu is currently a master student at the Wuhan University.His current research mainly focuses on the determination of geopotential based on Global Navigation Satellite System(GNSS)time transfer technique;corresponding author:Ziyu Shen is currently a lecturer at the School of Resources,Environmental Science and Engineering,Hubei University of Science and Technology,Xianning,China.His current research mainly focuses on relativistic geodesy and satellite frequency transfer.E-mail address:theorhythm@foxmail.com;Wenbin Shen is the head and professor of Department of Geophysics,School of Geodesy and Geomatics,Wuhan University.He received his Ph.D.from Graz Technical University in Austria in 1996.He holds memberships of IAG,EGU,AGU,and IUGG.His research interests focus on relativistic geodesy,Earth rotation and global change,Earth's free oscillation;Xiao Sun is currently a master student at the Wuhan University.His current research mainly focuses on relativistic geodesy based on microwave links between satellites and ground station;Chenghui Cai is currently a Ph.D.candidate at the School of Geodesy and Geomatics,Wuhan University.His current research mainly focuses on relativistic geodesy and GNSS time transfer;Yifan Wu is currently a master student at Wuhan university.His current research mainly focuses on the gravity potential determination based on GNSS and VLBI technique.
