  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 provide experimental results of
geopotential difference determination based on frequency comparisons between
two remote hydrogen atomic clocks, with the help of common-view satellite time
transfer (CVSTT) technique. For the first time we apply the ensemble empirical
mode decomposition (EEMD) technique to the CVSTT observations for effectively
determining the geopotential-related signals. 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
orthometric height (OH) of LTS determined by the clock comparison is deviated
from that determined by the Earth gravity model EGM2008 by (38.5$\pm$45.7)~m.
The results are consistent with the frequency stabilities of the hydrogen
clocks (at the level of $10^{-15}$~day$^{-1}$) used in the experiment. Using
more precise atomic or optical clocks, the CVSTT method for geopotential
determination could be applied effectively and extensively in geodesy in the
future.
