Experiments on geopotential determination based on direct clock comparison

Countdown
0 days

Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Experiments on geopotential determination based on direct clock comparison
Author(s)
Xiao Sun
Affiliation(s)
Wuhan University
KEYWORDS
geopotential determination, direct clock comparison
ABSTRACT
According to general relativity (GR), in a gravitational field, a clock at a position with higher geopotential runs faster than that with lower geopotential. To explore potential time-frequency application in geoscience, we have done an experiment using two-way satellite time and frequency transfer (TWSTFT) technique. In our experiment, two hydrogen atomic clocks (magnitude of frequencystability ) were used as time services, and they are placed on different floors to make a height difference of 22.2m.Our experiment lasted for about one month, to obtain enough time-varying clock difference. In our study,satellite delay difference,sagnac effect, ionospheric correction, tropospheric correction and other correction are taken into consideration,and a proposed signal processing method called ensemble empirical mode decomposition (EEMD)was adopted, to remove periodic signals and noise. We expect the relativistic geodesy method for determining the geopotential and orthometric height difference may bepracticable in the future.This study is supported by National 973 Project China (grant No. 2013CB733301 and 2013CB733305) and NSFCs