Long-Range Kinematic Positioning Made Easy Using Three Carrier GNSS Signals

Yanming Feng

Abstract:	The existing techniques to resolve the carrier-phase ambiguities with three frequency GNSS signals, either geometry-free or geometry-dependent methods, are distance-dependent. In this paper, we use the geometryfree approach to resolve the integer ambiguities of two linearly independent, double differenced widelane phases using combined carrier and code measurements where the first-order ionospheric effect is cancelled. The differential ionospheric delay is then determined with the two ambiguity-resolved widelane phases, and used to correct for the differential ionospheric effects in these widelane measurements. As a result, positioning can be performed with ambiguity-fixed and ionospherecorrected widelane signals over any distances. The accuracy is subject to the effects of the remaining errors, such as phase noise, differential orbital and tropospheric effects. Typically decimetre level is achievable. Simulation studies have demonstrated the positioning accuracy under different phase noise and troposphere conditions. Numerical analysis with dualfrequency GPS data has demonstrated that the proposed approach performs generally well for the GPS widelane (L1-L2) combination. With the three carrier signals shortly available for civilian use, development can turn to the total TCAR solutions for all the three phase measurements. Eventually, positioning can be performed with ambiguity resolved and ionospheric corrected narrow-lane measurements, achieving centimeter accuracy over distances of hundreds of kilometers.
Published in:	Proceedings of the 2005 National Technical Meeting of The Institute of Navigation January 24 - 26, 2005 The Catamaran Resort Hotel San Diego, CA
Pages:	694 - 702
Cite this article:	Feng, Yanming, "Long-Range Kinematic Positioning Made Easy Using Three Carrier GNSS Signals," Proceedings of the 2005 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2005, pp. 694-702.
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