V.F. Fateev, E.A. Rybakov, V.P. Sysoev, A.I. Zharikov, F.R. Smirnov

Al’manac of Modern Metrology № 2 (7) 2016, pages 67–74

The paper presents the results of two ground-based experiments to determine the orthometric height difference between a stationary atomic clock and a transportable hydrogen atomic clock based on the measurement of the gravitational effect of their time scales dilation. The stability of the transportable atomic clock was 3∙10^-15. The experiments included initial mutual synchronization of the two clocks, moving one of them to a ground point with a different orthometric height (a different gravitational potential) and measuring the time scales dilation at one-day intervals using synchronization with GLONASS/GPS receivers. The stationary clock was located at VNIIFTRI and the transportable clock was placed at two points: in Moscow (difference in height -100 m, distance 46 km) and in the Caucuses Mountains (difference in height +1804 m, distance1408 km). The measured gravitational effect in the first experiment was about -1ns, with a measurement error of 0.3 ns, and in the second experiment it reached +17ns with a measurement error of 0.8 ns. This corresponds to the errors in the determination of orthometric heights of 32 m and 85 m, respectively.

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