ANALYSIS OF PROBABILITY OF MISLEADING INFORMATION FOR LAAS SIGNAL IN SPACE

Curtis A. Shively

Peer Reviewed

Abstract:	The Federal Aviation Administration’s FAA’s Local Area Augmentation System LAAS provides misleading information when integrity checks at the LAAS ground facility LGF and a vertical protection level VPL computed in the aircraft allow the navigation system error to exceed acceptable limits without generating an alert. This paper presents a detailed analysis of the probability of misleading information P in the case of MI one or two ground reference receiver failures. Performance is computed as a function of the size of the resulting position error. The analysis shows that the aircraft VPL check alone provides a P that peaks at the design value MI and is significant only over a narrow range of position errors. Thus, the aircraft VPL parameters documented in the LAAS Minimum Aviation System Performance Standards MASPS 1 actually provide a significant P MI performance margin. Consequently, the tolerable a priori probability of LGF reference receiver failure may be larger than originally assumed.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 47, Number 2
Pages:	128 - 142
Cite this article:	Shively, Curtis A., "ANALYSIS OF PROBABILITY OF MISLEADING INFORMATION FOR LAAS SIGNAL IN SPACE", NAVIGATION: Journal of The Institute of Navigation, Vol. 47, No. 2, Summer 2000, pp. 128-142.
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