Time Dissemination and Common View Time Transfer With Galileo: How Accurate Will It Be?

J. Furthner, A. Moudrak, A. Konovaltsev, J. Hammesfahr, H. Denks

Abstract:	The future European navigation system Galileo will provide both positioning and timing capabilities to its users in the frame of four basic navigation services. Two of them are of special interest: the Safety-of-Life (SoL) Service that will be associated with certain performance guarantees, and the Open Service that will be provided free of charge. In this paper, we assess the average accuracy of user synchronization to the Galileo system time using a prospective Galileo error budget and simulations of the Galileo satellite constellation. These simulations also allowed us to transform the (guaranteed) positioning performance of Galileo’s SoL Service into the timing domain, and, thus, to identify the guarantees for timing users of this service. For comparison purposes, the timing accuracy of GPS – considering its actual and projected error budget – is shown. We also demonstrate the performance of four selected processing techniques – an optimally unbiased moving average, an adaptive linear enhancer, a Kalman filter, and a smoother – applied to Galileo Common View data that were simulated with the help of DLR’s GNSS simulation tool NavSim.
Published in:	Proceedings of the 35th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 2003 Hilton Resort on Mission Bay San Diego, California
Pages:	185 - 198
Cite this article:	Furthner, J., Moudrak, A., Konovaltsev, A., Hammesfahr, J., Denks, H., "Time Dissemination and Common View Time Transfer With Galileo: How Accurate Will It Be?," Proceedings of the 35th Annual Precise Time and Time Interval Systems and Applications Meeting, San Diego, California, December 2003, pp. 185-198.
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