A preliminary experiment of determining the geopotential difference using two hydrogen atomic clocks and TWSTFT technique

作者：Kuangchao Wu,Ziyu Shen,Wenbin Shen,Xiao Sun,Chenghui Cai,Yifan Wu

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).

发文机构：School of Geodesy and Geomatics Hubei University of Science and Technology State Key Laboratory of Information Engineering in Surveying

关键词：HydrogenatomicclockTWSTFTtechniqueEEMDmethodGEOPOTENTIAL

分类号： P127.1[天文地球—天体测量]