Availability of GPS/LORAN-C For Nonprecision Approach

Jay Weitzen, Karen Van Dyke and James Carroll

Abstract:	This paper analyzes the availability of Receiver Autonomous Integrity Monitoring (RAIM) when GPS is augmented with Loran-C for nonprecision approach mode of flight. Availability of the augmented system is calculated at approximately 2300 airports over the Continental United States, The results demonstrate that GPS availability is significantly enhanced with Loran and barometric altimeter augmentation. The percentage of the time which augmented GPS is unavailable for nonprecision approach is reduced by at least two orders of magnitude relative to non-augmented GPS. Loran-C is an approved supplemental nonprecision approach landing system which can function as a stand alone backup if GPS is degraded or unavailable. A GPS/Loran system represents an improved, redundant and generally more robust supplemental navigation system. The augmentation of GPS with Loran, however, cannot satisfy requirements for a primary means navigation system.
Published in:	Proceedings of the 1996 National Technical Meeting of The Institute of Navigation January 22 - 24, 1996 Loews Santa Monica Hotel Santa Monica, CA
Pages:	209 - 217
Cite this article:	Weitzen, Jay, Van Dyke, Karen, Carroll, James, "Availability of GPS/LORAN-C For Nonprecision Approach," Proceedings of the 1996 National Technical Meeting of The Institute of Navigation, Santa Monica, CA, January 1996, pp. 209-217.
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