A Real Time Ambiguity Search Technique for Precise Positioning Using GPS L1 Carrier Phase

Young Jae Lee, YU-Doo Won, Gyu-In Jee, Chan Gook Park

Abstract:	This paper proposes a reliable and effective OTF ambiguity algorithm, called FAST (Fast Ambiguity Search Technique), using GPS L 1 carrier phase. The FAST has been developed by combining some advantage of several methods such as LAMBDA (Least squares AMBiguity Decorrelation Adjustment), LSAST (Least Squares Ambiguity Search Technique), and ARCE (Ambiguity Resolution with Constraint Equation). The variance-covariance matrix of ambiguity is correlated in general. If this matrix can be transformed to a diagonal matrix by the LAMBDA method, then integer estimation method becomes effective and simple. The LSAST is based on a sequential adjustment, which use primary set of observations for an initial solution first, and then uses secondary set of observations for an updated solution. This process reduces the search space and computational load. However, whenever LSAST finds the true ambiguity integers, and then the corresponding position solution must be determined at the same time. On the other hand, ARCE makes position solution unnecessary by using the null space transformation. The FAST, the proposed algorithm, combines all of these advantages. For the performance improvement, FAST has been compared with LSAST and ARCE. By the results of the several experiments, it has been proved that FAST is more fast, reliable, and effective in real-time precise positioning and attitude determination than LSAST and ARCE.
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:	1589 - 1596
Cite this article:	Lee, Young Jae, Won, YU-Doo, Jee, Gyu-In, Park, Chan Gook, "A Real Time Ambiguity Search Technique for Precise Positioning Using GPS L1 Carrier Phase," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1589-1596.
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