Title: ARAIM with Weighted False Alarm Allocation
Author(s): Jakub Skalicky, Martin Orejas and Ute Ziegler
Published in: Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017)
September 25 - 29, 2017
Oregon Convention Center
Portland, Oregon
Pages: 2477 - 2481
Cite this article: Skalicky, Jakub, Orejas, Martin, Ziegler, Ute, "ARAIM with Weighted False Alarm Allocation," Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 2477-2481.
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Abstract: Advanced RAIM (ARAIM) is currently being considered as the baseline solution to warrant integrity of the computed position in the future safety-critical applications. Extensive research covers its various aspects, such as availability simulations, values of certain input parameters, possible optimizations etc. This paper is a contribution to this effort, presenting a novel method of uneven distribution of total continuity budget among individual subsolutions. The desired goal is a lower magnitude of protection levels at decent computational overhead without violating any safety assumptions. The method consists in predetermining certain values subsequently used to yield respective subsolution’s weight. Each subsolution is then allocated a portion of the total false alarm budget proportional to this weight. With recomputed detection thresholds based on these uneven false alarm allocations, the “weighted” protection level is established. In this paper, world-grid simulations are presented that quantify the benefit of the method in terms of the protection levels. Moreover, an implementation in software has been benchmarked to assess the impact of the method on the integrity monitoring processing time.