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Two-Way Time Transfer via Geostationary Satellites NRC/NBS, NRC/USNO and NBS/USNO via Hermes and NRC/LPTF (France) via SymphonieIn most of the experiments, 1 pps pulses of the station atomic clocks were exchanged between the partners, and a cubic equation was fitted to the 1000 to 2000 second measurements. The equations were exchanged and substracted to obtain the time difference of the stations. The standard deviation in the fit of the equations varied, depending on conditions, from 1.5 ns to 16 ns. For the last month of the Hermes experiment, a 1 MHz signal was used, giving a standard deviation of 0.18 ns. The comparison of the time scales via satellite and via Loran-C (BIH Circular D) show clearly that some Loran-C links are very good, but that the NBS link varies by 1 micron s. Via the satellite the frequencies of the time scales can be compared with an accuracy of 2 x 10 to the minus 14 power.
Document ID
19800020621
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Costain, C.
(National Research Council of Canada Ottawa Ontario, Canada)
Boulanger, J. S.
(National Research Council of Canada Ottawa Ontario, Canada)
Daams, H.
(National Research Council of Canada Ottawa Ontario, Canada)
Hanson, D. W.
(NBS Boulder, United States)
Beehler, R. E.
(NBS Boulder, United States)
Clements, A. J.
(NBS Boulder, United States)
Davis, D. D.
(NBS Boulder, United States)
Klepczynski, W. J.
(USNO Washington D.C., United States)
Veenstra, L. B.
(COMSAT Labs. Clarksburg, Md., United States)
Kaiser, J.
(COMSAT Labs. Clarksburg, Md., United States)
Date Acquired
August 29, 2013
Publication Date
January 1, 1979
Publication Information
Publication: NASA. Goddard Space Flight Center Proc. of the 11th Ann. Precise Time and
Subject Category
Physics (General)
Accession Number
80N29122
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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