T&F Comparisons via Broadcasting Satellite and Navigation Technology Satellite

Y. Saburi, Y. Yasuda, S. Kobayashi, T. Sato

Abstract:	The paper describes the results of a preliminary experiment of T/F dissemination via the MediumScale Broadcasting Satellite for Experimental Purposes (BSE) and those of the international time transfer experiment via the Navigation Technology Satellite (NTS-1). (1) The preliminary T/F dissemination experiments have been made using the BSE, which has the down-link of 12 GHz and the up-link of 14 GHz. The measured short-term stability of the received TV sub-carrier frequency is as good as in the terrestrial TV broadcasting, e.g., Oy (10 sec)-3x10-11. In order to establish the technique of the doppler shift canceling, the phase control servo including the satellite link, the pre-compensating frequency control using the measured values or using the orbital data of the satellite are tested. The amount of the residual doppler shift at the control station can be reduced to the order of 1 part in 1012 or less by use of the first and the second methods. The method using the orbit data is expected to give a control capability of a few parts in 1011. Thus, the maximum value of the doppler shift at the farther-most place of the country is estimated to te +2 x 10-10 without any correction. As to the time comparison, the experiment is now proceeding. (2) The experiment of the international time comparison via the NTS-1 had been made for about one year since October 1978, by the support of the GSFC of NASA and the NRL. The data of time difference between UTC (USNO) and UTC (RRL) are in good agreement with those via the portable clock of the USNO. By applying the correction for ionospheric delay using the model developed by Bent, the standard deviation of the data can be reduced to about one-half.
Published in:	Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 29, 1979 Goddard Space Flight Center Greenbelt, Maryland
Pages:	315 - 328
Cite this article:	Saburi, Y., Yasuda, Y., Kobayashi, S., Sato, T., "T&F Comparisons via Broadcasting Satellite and Navigation Technology Satellite," Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1979, pp. 315-328.
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