The benefits of the GPS three frequencies on the ambiguity resolution techniques

Carmen Bonillo-Martínez, Manuel Toledo-López, Miguel Romay-Merino

Abstract:	The goal of this paper is to report the results coming from the analysis of the ambiguity resolution techniques (kinematic) in the future GPS three frequencies frame, which is being performed at GMV as part of its research and development activities. This analysis is being carried-out in two different phases: first, the design and refinement of a dedicated algorithm that makes the best use of the new GPS measurements, and, second, a simulation phase, by analysing the performances of such algorithm with a reliable GPS-signal simulator. An algorithm has been designed taking into account that, for the specific frequencies selected for the future GPS, other measurements combinations (apart from wide-lane) can give good results taking advantage of the integer nature of the carrier phase ambiguities. In addition, the new developed algorithm can also be complemented with the classical ambiguity resolution methods based on the evaluation of several epochs measurements. The algorithm makes use of the a priori knowledge of the ionosphere. A performance assessment of the designed algorithm has been performed for the already selected GPS frequencies values. Performance aspects such as reliability, availability, final achievable user accuracy and baseline distance sensitiveness are considered. The new developed algorithm with the new signals significantly improves the robustness and reliability of the current GPS kinematic algorithms, and enables unprecedented instantaneous integer ambiguities determination providing highly accurate position location even at long distance from the reference station. In those cases in which special conditions are met, the method also capable of solving the absolute ambiguity (i.e. that related to only one receiver-one satellite measurement).
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1737 - 1746
Cite this article:	Bonillo-Martínez, Carmen, Toledo-López, Manuel, Romay-Merino, Miguel, "The benefits of the GPS three frequencies on the ambiguity resolution techniques," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1737-1746.
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