GNSS Receiver Autonomous Integrity Monitoring: A Separability Analysis

S. Hewitson

Abstract:	Receiver Autonomous Integrity Monitoring (RAIM) refers to integrity monitoring of GNSS navigation signals performed by a receiver independent of external reference systems, except for the navigation signals themselves. Quality measures need to be used to evaluate the GNSS RAIM performance at different locations and under various navigation modes, such as GPS only and GPS/Galileo integration, etc. The quality measures should include both the reliability and separability. The reliability measure is used to evaluate the capability of GNSS receivers to detect the outliers, while the separability measure is used to assess the capability of GNSS receivers to correctly identify the outlier from the measurements processed. In this paper, the mathematical models for RAIM and its measures of reliability and separability are described. Detailed simulations have been carried to evaluate the reliability and separability performance of GPS only and integrated GPS/Galileo navigation solutions. Simulation results show that, in comparison with the GPS-only solution, the separability of the integrated GPS/Galileo solution is improved by over 150%.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1502 - 1509
Cite this article:	Hewitson, S., "GNSS Receiver Autonomous Integrity Monitoring: A Separability Analysis," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1502-1509.
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