LASSO, Two-Way and GPS Time Comparisons: A (very) Preliminary Status Report

C. Veillet, D. Feraudy, J.M. Torre, J.F. Mangin, P. Grudler, F. Baumont, J. Gaignebet, J.L. Hatat, W. Hanson, A. Clements, J. Jespersen, M. Lombardi, D. Kirchner, G. Kirchner, H. Ressler, S. Fassl, W.J. Klepczynski, P.J. Wheeler, W. Powell, A. Davis, M. Granveaud, P. Uhrich

Abstract:	This very preliminary report briefly presents the first results on the time transfer experiments between TUG (Graz, Austria) and OCA (Grasse, France) using common view GPS, and two-way stations at both sites. The present data, providing arms of the clock offsets of 2 to 3 nanoseconds for a three months period, have to be further analysed before any conclusions on the respective precision and accuracy of these techniques can be drawn. Two years after its start, the LASSO experiment is finally giving its first results at TUG and OCA. The first analysis of three common sessions permitted us to conclude that the LASSO package on board of Moteosat P2 is working satisfactorily, and that time transfer using this method should provide clock offsets at better than 1 nanosecond precision, and clock rates at better than 1012 s/s in a 5 to 10 minutes session. A new method for extracting this information from the raw data sent by LASSO should enhance the performances of this experiment, exploiting the stability of the on-board oscillator.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	575 - 582
Cite this article:	Veillet, C., Feraudy, D., Torre, J.M., Mangin, J.F., Grudler, P., Baumont, F., Gaignebet, J., Hatat, J.L., Hanson, W., Clements, A., Jespersen, J., Lombardi, M., Kirchner, D., Kirchner, G., Ressler, H., Fassl, S., Klepczynski, W.J., Wheeler, P.J., Powell, W., Davis, A., Granveaud, M., Uhrich, P., "LASSO, Two-Way and GPS Time Comparisons: A (very) Preliminary Status Report," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 575-582.
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