Patent ID: 8558736
Filing Date: 2013-10-15
Classification: G01S

Abstract:
1. 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, 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 statistial 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; c. applying to the set of GNSS signal data a bank of auxiliary ionosphere filters each using an auxiliary ionospheric combination to obtain an array of auxiliary-ionosphere-filter ambiguity estimates for the auxiliary ionospheric combinations and associated statistical information, wherein each said auxiliary ionospheric combination uses carrier-phase observations of a third frequency and carrier-phase observations of at least one of the first frequency and the second frequency, and d. 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 and the auxiliary ionosphere filters.