On-The-Fly Carrier Phase Ambiguity Resolution for Precise Aircraft Landing

Helmut Blomenhofer, Gunter W. Hein, and David Walsh

Abstract:	Successful GPS on-the-fly (OTF) carrier phase ambiguity resolution for precise positioning at the centimetre level has already been demonstrated. This has usually been in good observation conditions, e. g. over short distances, lots of satellites, P code pseudoranges available, and small umuodelled errors. In order for GPS to fulfill the rigorous ICAO Cat. III precise landing navigation requirements centimeter-level accuracy must also be obtained in more realistic conditions, e. g. A-S on, high-unmodelled errors and less than six satellites. Integrating GPS with other sensors, e. g. INS is likely to aid ambiguity resolution in such conditions, but there are limitations. After discussing critically the OTF methods, approaches are examined which will provide the precise accuracy, reliability and integrity required. Combining GPS with one, or more, pseudolites to provide an extra geometric constraint to aid ambiguity resolution is described. Flight tests using different configurations of pseudolites are carried out and analyzed.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	821 - 830
Cite this article:	Blomenhofer, Helmut, Hein, Gunter W., Walsh, David, "On-The-Fly Carrier Phase Ambiguity Resolution for Precise Aircraft Landing," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 821-830.
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