Evaluation of Multi-constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals with Multiple Faults

Myungjun Choi, Juan Blanch, Todd Walter, Dennis Akos, Per Enge

Abstract:	In the next years, two major changes in the GNSS environment could enable worldwide vertical guidance: the new L5 civil signal transmission and the launch of new GNSS constellation such as GLONASS, Galileo, and Compass. With these two enhancements, receivers can mitigate the ionospheric induced error and be used in Advanced RAIM for vertical guidance. For this purpose, several Advanced RAIM (ARAIM) algorithms have been proposed and extensive evaluations [1], [2], [3] have been implemented in order to achieve global coverage of LPV200. Previous work [4] has demonstrated the performance of multi-constellation ARAIM with real data. However, the previous evaluation focused on accuracy and Vertical Protection Level (VPL) requirements. In addition, that effort only tested nominal case and one satellite fault situation. Therefore, additional effort is necessary for other requirements, which is addressed in [3], [5]. Moreover, tests with extended failure states, such as multiple satellite failure and a constellation failure, must be performed to test the ability of multi-constellation ARAIM to provide integrity. In this paper, we will first present an accurate error model for both GPS and GLONASS using real data from our multi-constellation capable receiver. Then we will implement all the requirements of LPV-200 in our ARAIM prototype. The four requirements are 4 m 95% accuracy, 10 m fault free 10-7 vertical position error bound, and 35m VPL. Then we will show the performance of multi-constellation ARAIM under additional injected fault states which include cases with more than two satellites failures. This will be done using GPS and GLONASS real measurement data with either actual faults or simulated faults added to the real data.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	884 - 892
Cite this article:	Choi, Myungjun, Blanch, Juan, Walter, Todd, Akos, Dennis, Enge, Per, "Evaluation of Multi-constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals with Multiple Faults," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 884-892.
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