Availability of GPS/INS Integration Methods

Tim Murphy, Matt Harris and Michael Braasch

Abstract:	This paper presents the results of an availability analysis for several GPS/INS integration methods. The availability of a range of RNP levels for current fielded Airplane Based Augmentation Systems (ABAS) designs, and the Multiple Solutions Separation (MSS) augmentations is presented. This performance is compared with the availability of RNP service using RAIM with fault detection (RAIM FD) and RAIM with fault detection and exclusion (RAIM FDE) augmentations. The availability analysis was performed using several different assumed GPS satellite constellation configurations (e.g. 24 satellites, 30 satellites etc.). Constellation states operating for 24 hours with up to 4 satellites removed were considered and weighted by the probability of their occurrence. The availability of a range of RNP levels (up to 4 nautical miles) given each augmentation is presented in graphical form for several user locations. Some discussion of the regional variation of the results is included. The paper shows the relative merits of tightly coupled GPS/INS integration for GPS integrity monitoring in terms of increased availability of specific levels of service. The paper further contrasts this difference to the sensitivity of service availability to other factors such as the number of satellites in the constellation as well as the satellite reliability (i.e. MTBF, MTTR etc.)
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	600 - 609
Cite this article:	Murphy, Tim, Harris, Matt, Braasch, Michael, "Availability of GPS/INS Integration Methods," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 600-609.
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