Concept and Benefits of a Technology-Agnostic Dynamic Alert Limit Framework for a VTOL Autoland System

Finn Hübner, Mario Gäbel, Lukas Scholz, Ulf Bestmann

Peer Reviewed

Abstract:	In the context of developing any autoland system, it is critical to derive proper and valid requirements and not only achieve sufficient performance in terms of position estimation, but also provide independent means to monitor performance and alert if the solution is not reliable. This study presents a concept that derives top-level requirements for an eVTOL autoland system and its navigation function in a holistic approach based on EASA‘s PTS-VPT-DSN without requiring any specific technology. Specifically, a framework and software module are presented to derive dynamic Alert Limits based on presence constraints and calculated position. Using simulated approaches, the characteristics of the Alert Limits are analyzed. Advantages and limitations of the approach are identified. These investigations provide the basis for the subsequent development of an automatic landing system for VTOLs and for contrasting it with a protection level in a monitoring system.
Published in:	Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023) September 11 - 15, 2023 Hyatt Regency Denver Denver, Colorado
Pages:	2191 - 2205
Cite this article:	Hübner, Finn, Gäbel, Mario, Scholz, Lukas, Bestmann, Ulf, "Concept and Benefits of a Technology-Agnostic Dynamic Alert Limit Framework for a VTOL Autoland System," Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), Denver, Colorado, September 2023, pp. 2191-2205. https://doi.org/10.33012/2023.19446
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