GBAS Function Limited to CAT II

Lenka Zaviralova, Jolana Dvorska, Pavel Ptacek

Abstract:	This paper provides an overview of the outcomes of the initial feasibility study of GBAS functionality limited to CAT II, performed as a part of SESAR 9.12 project. First, general CAT II requirements and GBAS performance requirements were analyzed in the study. Based on requirements analysis the initial concept for GBAS functionality limited to CAT II was outlined by forming a vertical window at 100 ft height above threshold (HAT) with defined size and risk probability. The approach based on the autoland success criteria with respect to nominal, limit, and malfunction case was maintained for the CAT II window concept. A Horizontal window, similar to the vertical window, was outlined as well, although this option was not the main focus of the study. An overview of the requirements that could be updated in case of usage of the described concept of the CAT II window was provided. Finally, the precision approach fast-time simulations incorporating the GBAS noise model and generic business aircraft model were executed. Monte Carlo simulations of GBAS based approaches for nominal, limit and malfunction cases with overall 6 scenarios were performed and the results were statistically analyzed to assess the compliance with the potential CAT II window to assess its feasibility. Although a considerable effort was provided in this study, it should be emphasized that this study represents the preliminary feasibly study for GBAS CAT II functionality. Further studies done by the community and regulatory bodies are needed in order to obtain and validate the final concept. This study is focused on business aviation with respect to the simulation assessment and therefore should be revised for suitability assessment for the commercial aviation.
Published in:	Proceedings of the 2016 International Technical Meeting of The Institute of Navigation January 25 - 28, 2016 Hyatt Regency Monterey Monterey, California
Pages:	414 - 428
Cite this article:	Zaviralova, Lenka, Dvorska, Jolana, Ptacek, Pavel, "GBAS Function Limited to CAT II," Proceedings of the 2016 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2016, pp. 414-428. https://doi.org/10.33012/2016.13427
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