TWO-WAY TIME TRANSFERS BETWEEN NRC/NBS AND NRC/USNO VIA THE HERMES (CTS) SATELLITE

C.C. Costain, H. Daams, J.S. Boulanger, D.W. Hanson, W.J. Klepczynski

Abstract:	Two-way time transfers via the Hermes (CTS) satellite between NRC, Ottawa and NBS, Boulder and between NRC and USNO, Washington, D.C., began once a week in July 1978. At each station the differences were measured between the local UTC seconds pulse and the remote UTC pulse received by satellite. The difference between the readings, if station delays are assumed to be symmetrical, is two times the difference between the clocks at the two ground station sites. Over a 20-minute period, the precision over the satellite is better than I ns. The time transfer from NRC to the CRC satellite terminal near Ottawa and from NBS to the Denver HEW terminal are still subject to larger uncertainties which are being examined. The absolute measure of UTC differences also depends on the measurement of station delays, which in present circumstances will be difficult to carry out. Two years ago, discussions were started on the possibility of two-way time transfer between the NRC and LPTF in France using the Symphonie satellite.
Published in:	Proceedings of the 10th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 1978 Goddard Space Flight Center Greenbelt, Maryland
Pages:	585 - 600
Cite this article:	Costain, C.C., Daams, H., Boulanger, J.S., Hanson, D.W., Klepczynski, W.J., "TWO-WAY TIME TRANSFERS BETWEEN NRC/NBS AND NRC/USNO VIA THE HERMES (CTS) SATELLITE," Proceedings of the 10th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1978, pp. 585-600.
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