GNSS Availability Analysis in Taiwan - a Markov Model Approach

H-S. Wang and P-C. Hsiao

Abstract:	The main purpose of this paper is to present a Markov process approach to the analysis of GNSS (Global Navigation Satellite System) availability in Taiwan. The proposed model is capable of calculating a variety of statistical measures of the required services at locations specified by the user. The primary input data for the availability model is the MTBF (Mean Time Between Failure) and failure rate of the GPS (Global Positioning System) satellites. Then each visible set of satellites is checked to see if it satisfies the service accuracy criterion. Finally, in order to meet the integrity requirement, the number of the satellites and their corresponding geometry are verified to see if they meet the integrity threshold. For other types of navigation systems configurations (such as GBAS, GRAS, or SBAS) different service criteria may be added in the model. The analysis addresses GPS constellation of 24 satellites, and augmentation with geostationay satellites or pseudolites. Availability estimates for GPS, SBAS and GBAS are obtained by software simulation.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	759 - 769
Cite this article:	Wang, H-S., Hsiao, P-C., "GNSS Availability Analysis in Taiwan - a Markov Model Approach," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 759-769.
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