Full Flight Simulator Testing the Influence of the Spectral Content of the Navigation System Error During Automatically Flown Approaches

Andre Schuttpelz and Manfred Fricke

Abstract:	The amplitude spectra of the navigation system error (NSE) of the Ground Based Augmentation System (GBAS) shows a different characteristic compared to the instrument landing system (ILS). This could lead to problems during automatic approaches according to categories CAT II/III because existing autopilot systems are developed to cope with the ILS-NSE. Under usage of the A330/A340 Full Flight Simulator at the TU Berlin it was possible to investigate the behaviour of the A330/A340 flight management system influenced by a GBAS NSE in a safe way. The flights were performed as automatic approaches until touchdown. For comparison reasons manually flown approaches were also flown. As external disturbing factor the turbulence level of the simulation was varied. The GBAS CAT II/III specifications are currently under development, thus the main parameters that influence the spectral behaviour (time constant of the carrier smoothing filter, NSE amplitude and delay) are changeable. This paper presents the results obtained in these simulator flight trials.
Published in:	Proceedings of the 63rd Annual Meeting of The Institute of Navigation (2007) April 23 - 25, 2007 Royal Sonesta Hotel Cambridge, MA
Pages:	346 - 355
Cite this article:	Schuttpelz, Andre, Fricke, Manfred, "Full Flight Simulator Testing the Influence of the Spectral Content of the Navigation System Error During Automatically Flown Approaches," Proceedings of the 63rd Annual Meeting of The Institute of Navigation (2007), Cambridge, MA, April 2007, pp. 346-355.
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