GNSS Combined with Head-Up Display for Precision Landing

Jean-Francois Jehl and Luc Baron

Abstract:	With the growing interest in the airline community for G.N.S.S. and its contemplated precision performances, new avionics sub-systems combining the G.N.S.S. and Head-Up Display equipment can be designed. They offer cost-effective solutions for improving the landing function of an aircraft. Systems including G.N.S.S. can efficiently upgrade aircraft to achieve CAT2 and ultimately CAT3 weather conditions landing operational minimums thanks to HUD, without modification of the existing aircraft avionics and autopilot/autoland, to runways that currently can basically support non-precision approaches only. Examples may be given where the basic avionics (e.g. AHRS) have not, without G.P.S., the level of performance and precision that may be required for a HUD and, for some parameters, do not even compute them. The G.P.S. then provides additional inputs that allow to compute or enhance those data in the H.U.D. system. The resulting system, using hybrid algorithms, can be used for global operational improvement of the aircraft as SEXTANT Avionique successfully proposed it to Alitalia to gain CAT3B certification on their MD-82 aircraft initially CAT3A. The paper presents the architectures suitable for coupling the G.N.S.S. equipment to HUD and the achievable performances. The Alitalia’s MD-82 installation is described to emphasize the operational and economical advantages of such an “hybrid landing system” and summarize the main certification issues.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	1417 - 1424
Cite this article:	Jehl, Jean-Francois, Baron, Luc, "GNSS Combined with Head-Up Display for Precision Landing," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 1417-1424.
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