Flight Trial of a Regional Area Augmentation System (RAAS) for En-Route Navigation

James C. Lawson, Hemant Mistry, Lyn Dutton, Andrew McGregor

Abstract:	Many evaluations are currently underway to develop and assess requirements for regional area satellite based augmentations for en-route phases of flight and possibly Category I type precision approach applications. These evaluations are based around the use of a Regional Area Augmentation System (RAAS) concept, whereby a network of ground reference stations provide satellite differential and integrity messages which are then broadcast over a region to satisfy the Required Navigation Performance for a particular phase of flight. There are currently 3 wide- area RAAS’ under development: * WAAS, Wide Area Augmentation System * EGNOS, European Geostationary Overlay System * MTSAT, Mobile Transport Satellite Service The International Civil Aviation Organisation (ICAO) has tasked the GNSS Panel to develop standards and recommended practices for the use of satellite-based navigation in all phases of flight. Much work has yet to be undertaken to develop and validate requirements for RAAS applications and it is still unclear what maximum operational capabilities can be achieved using a satellite based augmentation system. This paper describes the frst test results from an operational test bed which has been developed in the UK to assess performance characteristics of possible RAAS augmentations. This test bed uses existing technology to test and simulate possible augmentations.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	475 - 481
Cite this article:	Lawson, James C., Mistry, Hemant, Dutton, Lyn, McGregor, Andrew, "Flight Trial of a Regional Area Augmentation System (RAAS) for En-Route Navigation," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 475-481.
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