Extended Availability and Continuity Computation Method to GPS Augmentations for Approach and Landing

Takeyasu Sakai and Kazunobu Koremura

Abstract:	Reliability is one of the important factors for aircraft navigation as well as positioning accuracy is. According to the draft international standards of the GNSS, the first GPS-based navigation system authorized for civil aviation, availability and continuity are employed as reliability measures. The paper describes algorithms to compute the availability and continuity reliability indicators for a GPS-based navigation system. The algorithms are fully suitable for fast computation techniques, and have a sort of flexibility to handle various constellations of ranging sources, for example, GPS, GLONASS, geostationary satellites, airport pseudolites, and any other facilities. Failure parameters are set to each individual satellite separately, changeable in time-domain. Knowledge of GPS signal availability is also provided by necessity for reliability computations. Computation examples are finally presented to demonstrate the level of reliability expected in a real operational system, assuming augmentation by SBAS (satellite-based augmentation system).
Published in:	Proceedings of the 2000 National Technical Meeting of The Institute of Navigation January 26 - 28, 2000 Pacific Hotel Disneyland Anaheim, CA
Pages:	408 - 417
Cite this article:	Sakai, Takeyasu, Koremura, Kazunobu, "Extended Availability and Continuity Computation Method to GPS Augmentations for Approach and Landing," Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2000, pp. 408-417.
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