RAIM AVAILABILITY FOR GPS AUGMENTED WITH BAROMETRIC ALTIMETER AIDING AND CLOCK COASTING

Young C. Lee

Peer Reviewed

Abstract:	In late 1991, the FAA formed a group called the Satellite Operational Implementation Team to accelerate the introduction of satellite navigation and communications into the National Airspace System (NAS). Since then, the team has been addressing major technical and operational issues that need to he resolved before GPS is used in instrument flight rules (IFR) operations in the NAS. One of the most critical criteria for the operational approval of near-term use of GPS in the NAS is availability of receiver autonomous integrity monitoring (RAIM) detection and identification functions. To improve RAIM availability, SOIT members suggested that relatively simple GPS augmentations in the form of barometric altimeter aiding and clock coasting he considered. This paper analyzes GPS RAIM availability with these augmentations and presents the technical analyses used by the team to support its recommendations.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 40, Number 2
Pages:	179 - 198
Cite this article:	Lee, Young C., "RAIM AVAILABILITY FOR GPS AUGMENTED WITH BAROMETRIC ALTIMETER AIDING AND CLOCK COASTING", NAVIGATION: Journal of The Institute of Navigation, Vol. 40, No. 2, Summer 1993, pp. 179-198.
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