Time Dissemination and Synchronization for Galileo Users

Alexandre Moudrak, Johann Furthner, Andriy Konovaltsev, Holmer Denks, and Jens Hammesfahr

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 would be of special interest for future users: the Safety-of-Life (SoL) Service which will be associated with certain performance guarantees, and the Open Service which will be provided free of charge. In this paper we assess the average accuracy of user synchronization to the Galileo system time using a projected Galileo error budget and simulations of the Galileo satellite constellation. These simulations also helped to transform the guaranteed positioning performance of Galileo SoL Service into the timing domain. For comparison purposes, the timing accuracy of GPS – considering its actual and projected error budgets – is presented. We also discuss potential Galileo applications for precise time transfer (Common View) and demonstrate the performance of four selected processing techniques – optimally unbiased moving average, adaptive linear enhancer, Kalman filter and smoother – applied to Galileo Common View data which were simulated with the help of DLR’s GNSS simulation tool NavSim.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	323 - 332
Cite this article:	Moudrak, Alexandre, Furthner, Johann, Konovaltsev, Andriy, Denks, Holmer, Hammesfahr, Jens, "Time Dissemination and Synchronization for Galileo Users," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 323-332.
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