A New Concept for GPS Phase Ambiguity Resolution On-The-Fly: The Maximum a Posteriori Ambiguity Search (MAPAS) Method

Christophe Macabiau

Abstract:	The use of the pseudorange information contained with- in the GPS carrier phase observables enables to achieve a high level of positioning accuracy, but requires the res- olution of the intrinsic cycle ambiguities of the phase measurements. Several methods have been proposed that can solve the ambiguities without static initializa- tion by performing a search of the most coherent values of the double difference ambiguities of four particular satellites. They belong to the class of the multiple hy- potheses sequential tests, that check each envisaged hy- pothesis against a decision criterion. A new method of ambiguity resolution on-the-fly, designed to make an op- timal use of all the available measurements, is proposed in this paper. The decision criterion used by this method is the a posteriori probability of each potential solution. The mathematical developments involved in the design of the method are exposed, and the first simulation re- sults obtained are presented, showing the validity of the concept proposed in this paper.
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:	299 - 308
Cite this article:	Macabiau, Christophe, "A New Concept for GPS Phase Ambiguity Resolution On-The-Fly: The Maximum a Posteriori Ambiguity Search (MAPAS) Method," 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. 299-308.
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