Ambiguity Resolution On-the-Fly - A Comparison of P Code and High Performance C/A Code Receiver Technologies

Gérard Lachapelle, M. Elizabeth Cannon and Gang Lu

Abstract:	Carrier phase ambiguity resolution on the fly is investigated using two receiver technologies, namely dual-frequency P code and high performance, single frequency, C/A code technology. The high performance C/A code receiver used for the test is the GPSCardru, designed and built by NovAtel Communications Ltd. The P code trials were conducted with 36-channel Ashtech P-XII receivers. A least-squares search technique is used to find the correct ambiguities. Both C/A and single frequency P code technologies are found to be equivalent and capable of resolving the integer ambiguities on the fly using some 30 to 200 seconds of data under benign multipath conditions. The time required and success rate are hovewer dependent on the error variance assigned to the carrier phase measurements. The use of widelaning with the dual frequency P code results in ambiguity resolution in seconds. The performance of widelaning is also superior in a comparatively high multipath environment.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	1025 - 1032
Cite this article:	Lachapelle, Gérard, Cannon, M. Elizabeth, Lu, Gang, "Ambiguity Resolution On-the-Fly - A Comparison of P Code and High Performance C/A Code Receiver Technologies," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 1025-1032.
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