Geopotential difference determination using optic-atomic clocks via coaxial cable time transfer technique and a synthetic test  

作　　者：Shen Ziyu Shen Wenbin 

机构地区：[1]School of Geodesy and Geomatics/Key Laboratory of the Geospace Environment and Geodesy,Wuhan University [2]State Key Laboratory for Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University

出　　处：《Geodesy and Geodynamics》2015年第5期344-350,共7页大地测量与地球动力学（英文版）

基　　金：supported by National 973 Project China(2013CB733301,2013CB733305);NSFC(41174011,41429401,41210006,41128003,41021061)

摘　　要：According to the general theory of relativity, two clocks placed at two different positions with different geopotentials run at different rates. Thus one can determine the geopotential difference between these two points by comparing the running rates of the two clocks. Using the most precise optic-atomic clocks whose stability achieves 10 is level and the time transfer technique with comparison accuracy higher than 10ps level by 100 m coaxial cable, the relativistic geodesy method for determining the geopotential may be realizable in the near future. In this paper, we propose, design and describe in detail an approach for determining the geopotential difference between two points based upon a simulation experiment. We select two stations A and B whose ground distance is within 100 m, height difference being about 30 m. Each station is equipped with an atomic clock whose instability is 3.2 × 10-16/√τ （where τis time in second）. And the two stations are connected with a coaxial cable for time transfer. Our simulation experiment results show that the accuracy could reach 0.16 m2/s2 （equivalent to 1.6 cm in height） level after a fourhour period of observation.According to the general theory of relativity, two clocks placed at two different positions with different geopotentials run at different rates. Thus one can determine the geopotential difference between these two points by comparing the running rates of the two clocks. Using the most precise optic-atomic clocks whose stability achieves 10 is level and the time transfer technique with comparison accuracy higher than 10ps level by 100 m coaxial cable, the relativistic geodesy method for determining the geopotential may be realizable in the near future. In this paper, we propose, design and describe in detail an approach for determining the geopotential difference between two points based upon a simulation experiment. We select two stations A and B whose ground distance is within 100 m, height difference being about 30 m. Each station is equipped with an atomic clock whose instability is 3.2 × 10-16/√τ （where τis time in second）. And the two stations are connected with a coaxial cable for time transfer. Our simulation experiment results show that the accuracy could reach 0.16 m2/s2 （equivalent to 1.6 cm in height） level after a fourhour period of observation.

关 键 词：Geopotential differenceAtomic clockTime transferCoaxial cableSynthetic 

分 类 号：P22[天文地球—大地测量学与测量工程]