WAAS, EGNOS, and MSAS for Telecom Sync

Hugo Fruehauf

Abstract:	The WAAS, EGNOS, and MSAS GPS Augmentation Systems bridge the gap between the military applications of GPS and the needs of civil aviation navigation. these USA, Europe, and Asian systems consist of a network of differential GPS ground stations, using principally the Inmarsat-3 geosynchronous satellite constellation as the means of relating the differential corrections to the users. In the process of providing precise navigation signals, GPS time is maintained through the Inmarsat-3 downlinks. It is this functionality that provides for robust time retrieval for the synchronization needs of the telecommunications community. This paper discusses: - The basic makeup and performance of the system - How time and frequency can be extracted for the telecom terminals - Added functionality and noise rejection capabilities using these signals for telecom timing applications - How the system offers the first true backup to the GPS C/A signal for telecom synchronization users
Published in:	Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 2000 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	31 - 44
Cite this article:	Fruehauf, Hugo, "WAAS, EGNOS, and MSAS for Telecom Sync," Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2000, pp. 31-44.
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