Evaluation of Various Algorithms for GPS Post-Processed On-The-Fly Ambiguity Resolution

Jon Burgess, Jim Collins

Abstract:	Post-processed, highly accuratecivil applications for GPS derived coordinates are being developed seemingly every day. Differential positioning based on the GPS C/A code provides post-processed accuracies in the range of 1 to 5 meters today, while carrier-smooted differential position- ing, also based on the C/A code, can yield accuracies in the sub-meter range - unheard of accuracies even a year ago! Using the C/A carrier phase signal in a post-processed differential mode can give better results, but it typically requires static initialization which restricts wide applica- tion of the procedure. To increase the application of this procedure, the user must be able to resolve initial ambigu- ities while in motion or on-the-fly (OTF). There are currently many commercial companies and private and government researchers that claim to be able to do such a feat; to resolve ambiguities OTP using the C/A carrier phase signal in a post-processed differential mode. If true, these techniques will revolutionize GPS surveying. This paper will present a technical discussion on resolving carrier-phase ambiguities OTP using their proposed tech- niques, data processed using their algorithms compared with various truth systems, and some final conclusions based on research of their algorithms.
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:	1125 - 1125
Cite this article:	Burgess, Jon, Collins, Jim, "Evaluation of Various Algorithms for GPS Post-Processed On-The-Fly Ambiguity Resolution," 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. 1125-1125.
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