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Analysis of Probability of Misleading Information for LAAS Signal in Space
2001 Award Winner
Curtis A. Shively, The MITRE Corporation
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 (PMI) in the case of 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 PMI which peaks at the design value 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 significant PMI performance margin. Consequently, the tolerable a-priori probability of LGF reference receiver failure may be larger than originally assumed.
Publication
Published in 2000. NAVIGATION: Journal of the Institute of Navigation, Vol. 47, No. 2, pp. 128–142.
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