Missed Detection Probability Requirements for LAAS Integrity Monitoring of Ranging Sources

Ronald Braff

Abstract:	As with the conventional air navigation aids, ground-based augmentation systems for satellite navigation provide integrity monitoring to detect ranging source signal failures. For satellite-based ranging sources the monitored failure classes are uncorrectable ephemeris error, excessive satellite clock acceleration, signal deformation, excessive code-carrier divergence, and low signal level. This paper describes an analytical technique used to derive the probability of missed-detection requirements of these fault classes for the Performance Type 1 (PT1) Local Area Augmentation System (LAAS) Ground Facility (LGF) specification. This technique is based on a state probability model where the transition probability matrix accounts for failure generation and detection. The model provides a structured approach to derive integrity risk from the probability of being in an undetected failure state. Although the results are applied to LAAS, the model has general application to other augmentation systems. The results are dependent on the prior probabilities of classes of failures, which are uncertain at this time. To circumvent this problem, an upper-bound failure rate is assumed.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	663 - 670
Cite this article:	Braff, Ronald, "Missed Detection Probability Requirements for LAAS Integrity Monitoring of Ranging Sources," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 663-670.
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