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Derivation of Ranging Source Integrity Requirements for the Local Area Augmentation System (LAAS)
2001 Award Winner
Ronald M. Braff, The MITRE Corporation
Curtis A. Shively, The MITRE Corporation
ABSTRACT
Several satellite latent fault modes can cause errors that may not be removed by pseudorange corrections or be detected unless special augmentation-based integrity monitors are employed. The error classes resulting from satellite fault modes are distorted signal waveform, uncorrectable ephemeris error, excessive clock acceleration, excessive code-carrier divergence, and low signal power. The paper derives the integrity monitoring parameters for these errors through mathematical analyses and error bounding rationales. The integrity parameters are the maximum allowable error in the pseudorange corrections and the probability of missed detection of this error. The inputs to the analyses are the integrity monitoring operational requirements contained in the Minimum Aviation System Performance Standards for the Local Area Augmentation System (LAAS). The results of the analyses are used as the basic performance requirements for ranging source integrity monitoring in the FAA’s LAAS Ground Facility specification. The paper includes model derivations and an example application to the signal waveform distortion error class.
Publication
Published in 2000. NAVIGATION: Journal of the Institute of Navigation, Vol. 47, No. 4, pp. 279–288.
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