Real Time Zero-difference Ambiguities Fixing and Absolute RTK

D. Laurichesse, F. Mercier, J.P. Berthias, J. Bijac

Abstract:	Until recently it was believed that integer ambiguities could only be fixed on differenced measurements in order to remove biases. Recently Mercier and Laurichesse [2] have demonstrated that simple assumptions on bias stability are sufficient to fix integer ambiguities on zero-difference phase measurements. A solution for clocks over a regional network can then be computed using these unambiguous phase measurements and precise GPS satellites ephemerides (such as IGS products), giving integer phase clocks for the satellites. These clocks have an interesting property : they allow the positioning of an independent receiver using a PPP like method, with integer ambiguities properties on the phase residuals [1]. If this zero difference ambiguity fixing is performed in realtime, it becomes possible to compute RTK solutions with centimeter accuracy without using any close reference station. In this paper, we address real time issues of zero differenced ambiguity fixing, and we present a method for absolute RTK for dual-frequency receivers.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	747 - 755
Cite this article:	Laurichesse, D., Mercier, F., Berthias, J.P., Bijac, J., "Real Time Zero-difference Ambiguities Fixing and Absolute RTK," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 747-755.
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