GRAS applications: EGNOS TRAN

Niclas Gustavsson, Liliane Martineau, Antonio Salonico

Abstract:	GRAS (Ground Regional Augmentation System) is a broadcast service that provides GNSS augmentation data to mobile platforms in all aviation related user groups. The reasons for GNSS augmentation are to improve navigation and surveillance by improving performance in terms of accuracy, integrity, availability and continuity. The requirements on navigation and surveillance performance depend on the type of operation to be supported. GRAS is a gate-to- gate service that supports en-route, en-route/terminal area, non-precision approach and departure, approach with vertical guidance (APV-I), as well as airport surface operations and other applications such as ASAS. ESA (European Space Agency) is conducting the study called EGNOS TRAN (European Global Navigation Overlay System - Terrestrial Regional Augmentation Network) for terrestrial network solutions as a complement to EGNOS to provide EGNOS services in areas where signal is not available or not continuous (in difficult terrain, urban areas and Northern Latitudes), ETRAN could potentially provide improved EGNOS service. This paper presents successively the requirements of Civil Aviation service provider to support the gate to gate operations, further details on EGNOS TRAN network that to say its main characteristics and architecture, the requirements for user terminal specially for the airborne equipment and finally, the demonstrator will be briefly described.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	782 - 789
Cite this article:	Gustavsson, Niclas, Martineau, Liliane, Salonico, Antonio, "GRAS applications: EGNOS TRAN," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 782-789.
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