Patent ID: 8614642

Claim:
A method of processing a set of GNSS signal data derived from signals of a first set of satellites having at least three carriers and signals of a second set of satellites having two carriers, comprising: a. applying to the set of GNSS signal data a geometry filter using a geometry filter combination to obtain an array of geometry-filter ambiguity estimates for the geometry filter combination and associated statistical information, wherein the geometry filter combination comprises one of: a single-frequency carrier-phase and code combination, and a single-frequency carrier-phase and GRAPHIC combination; b. applying to the set of GNSS signal data a bank of ionosphere filters each using a two-frequency ionospheric combination to obtain an array of ionosphere-filter ambiguity estimates for the two-frequency ionospheric combinations and associated statistical information, wherein each said two-frequency ionospheric combination comprises a geometry-free two-frequency ionospheric residual carrier-phase combination of observations of a first frequency and observations of a second frequency; and c. preparing a combined array of ambiguity estimates for all carrier phase observations and associated statistical information by combining the arrays of the geometry filter and the ionosphere filters.