Error Propagation Concepts Including Flight Dynamics for Total System Performance Analysis During GBAS Based Initial CAT-III Approach and Landing

T. Dautermann, B. Belabbas, M. Meurer

Abstract:	In order to assess the integrity risk for GBAS based automatic approach and landing, we inves- tigated a total performance concept of a com- bined system consisting of an ILS look-a-like GBAS landing system (GLS) and a DeHavilland Dash-2 Beaver aircraft. We propagated four ba- sic pseudorange errors to a position error distri- bution, which was then the source of position un- certainties for the GLS installed in the aircraft. Results show that the vertical total system error (TSE) in the steady state nal approach lags be- hind the vertical navigation system error (NSE). The TSE is smoothed and preserves the general temporal sequence of the error. A reduction of 30% of the TSE standard deviation with respect to the NSE only occurs during a period of glide slope overshoot, where the autopilot uses large and steadily declining elevator de ections to re- turn to the desired glide path. With minor adap- tations this concept can be re ned and a possible error reduction may be achieved.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	1630 - 1636
Cite this article:	Dautermann, T., Belabbas, B., Meurer, M., "Error Propagation Concepts Including Flight Dynamics for Total System Performance Analysis During GBAS Based Initial CAT-III Approach and Landing," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 1630-1636.
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