GNSS signal processing for estimating phase adjusted timing signals

A method and apparatus are described for processing a set of GNSS signal data derived from code observations and carrier-phase observations at a plurality of receivers of GNSS signals from multiple satellites over multiple epochs, wherein the GNSS signals from at least two carrier frequencies have, as well as a navigation message containing orbit information, comprising: obtaining precise orbit information for each satellite, determining at least one set of ambiguities for each recipient, each of ambiguity one of a receiver-satellite connection and a satellite-receiver-satellite compound corresponds to, and using at least the precise orbit information, the ambiguities and the GNSS signal data for estimating a phase-adjusted time signal per satellite.