Methods and apparatus for GNSS signal processing

Are provided for processing a group of GNSS signal data derived from observations of GNSS signals from a plurality of transmitters over a plurality of epochs methods and apparatus, wherein the GNSS signals include a first signal and a second signal on a first band, can be tracked as a single wideband signal and each of which can be tracked separately, comprising the steps of: obtaining carrier-phase observations of the first signal, obtaining carrier-phase observations of the second signal, obtaining code observations of the wideband signal, and estimating from a group of observables which comprise the carrier phase observations of the first signal, the carrier phase observations of the second signal and the code observations of the wideband signal, of values ​​for a parameter group comprising: the position of a receiver of the GNSS signals, the clock error a receiver of the GNSS signals, and a Array of ambiguities, comprising an ambiguity for each transmitter can be achieved by the carrier phase observations of the first signal, and an ambiguity for each transmitter can be achieved by the carrier phase observations of the second signal.