Title: AMBIGUITY RECOVERY FOR LONG-RANGE GPS KINEMATIC POSITIONING
Author(s): Shaowei Han
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 44, Number 2
Pages: 257 - 290
Cite this article: Han, Shaowei, "AMBIGUITY RECOVERY FOR LONG-RANGE GPS KINEMATIC POSITIONING", NAVIGATION, Journal of The Institute of Navigation, Vol. 44, No. 2, Summer 1997, pp. 257-290.
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Abstract: An ambiguity recovery technique for long-range GPS kinematic positioning is proposed for determining the integer ambiguities when cycle slips occur or the data gap is shorter than a few minutes. Two combined carrier phase observables (++ - (92 and - 7~~ + 9& and precise pseudoranges are used to detect and remove cycle slips in the one-way carrier phase data, and subsequently validation criteria based on double-differenced carrier phase data are used to identify and validate the correct cycle slip values. If precise pseudoranges are not available, two combined carrier phase observables (pI - cpz and -3~~ + 4~~) and the predicted mobile receiver position are used to detect and remove cycle slips by means of a Kalman filter algorithm using an ambiguity function implementation. Results of an aircraft positioning experiment (baseline lengths of the order of 140 km) and a railway tracking experiment (baseline lengths of the order of 295 km) are presented.