Patent ID: 8188913

Claim:
A method for a global satellite navigation system with at least two carriers, comprising the actions of: forming a linear combination from the at least two carriers by a reference station for estimating a satellite-satellite single difference phase and code bias, and providing the estimated bias to a mobile receiver, enabling the mobile receiver to compute the same linear combination, to subtract the bias from the linear combination and to determine integer phase ambiguities, wherein the satellite-satellite single difference bias of a single ionosphere-free, geometry-preserving combination of the code and phase signals of at least two carriers is determined by using a maximum combination discrimination requirement or a minimum noise requirement for the linear combination, wherein an additional geometry-preserving, ionosphere-free code-carrier combination of time differences of measurements or time differences of geometry-preserving, ionosphere-free code-carrier combinations of measurements are used for determining the bias, and wherein the weighting coefficients of the additional combination fulfill the requirement that the additional combination and the other combination are uncorrelated.