Evaluating New and Current Horizontal Protection Levels in the Baseline ARAIM Algorithm

Danielle Racelis, Mathieu Joerger

Abstract:	The baseline algorithm for horizontal advanced receiver autonomous integrity monitoring (HARAIM) provides one acceptable means of computing a horizontal protection level (HPL) that meets the safety requirements for aircraft en-route navigation. The baseline HARAIM algorithm iteratively solves for a single protection level across all hypotheses, which is equivalent to optimally allocating the integrity risk requirement across all hypotheses for PL evaluation. This optimization process is separately carried out twice, in the East and North directions. In this paper, we perform this iterative process only once: we show that it is computationally more efficient and can provide a tighter bound on horizontal radial positioning errors than the baseline HPL. We derive a generalized chi-square formulation of the HPL to quantify the tightness of both the baseline and the proposed HPL bounds. We conduct a worldwide risk analysis to compare baseline, and new HPL approaches in terms of coverage of 100% availability.
Published in:	Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022) September 19 - 23, 2022 Hyatt Regency Denver Denver, Colorado
Pages:	238 - 246
Cite this article:	Racelis, Danielle, Joerger, Mathieu, "Evaluating New and Current Horizontal Protection Levels in the Baseline ARAIM Algorithm," Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), Denver, Colorado, September 2022, pp. 238-246. https://doi.org/10.33012/2022.18360
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