Estimation of Uncertainties in Time Error Estimation

F. Vernotte, J. Delporte, M. Brunet, T. Tournier

Abstract:	In navigation satellite systems, it is necessary to determine the difference between the on-board time and the reference time for each satellite. This offset can be estimated in real time by filtering time measurements collected over a ground station network and has to be extrapolated when the satellite is out of visibility of this network. This analysis has been carried out at the CNES in the GNSS2 and GALILEO context and leads to specifications on adjustment and extrapolation errors of the on-hoard time. The purpose of this paper is the estimation of the difference between the extrapolation and the real on-board time. After the description of the method, an example is given using real data, and the predicted extrapolation uncertainties are compared to the real extrapolation errors.
Published in:	Proceedings of the 31th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 1999 Marriott's Laguna Cliffs Resort Dana Point, California
Pages:	305 - 316
Cite this article:	Vernotte, F., Delporte, J., Brunet, M., Tournier, T., "Estimation of Uncertainties in Time Error Estimation," Proceedings of the 31th Annual Precise Time and Time Interval Systems and Applications Meeting, Dana Point, California, December 1999, pp. 305-316.
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