Method of factorisation of pseudorange dating in an assisted GNSS system.

A method of calculating a position of a mobile, wherein:an assistance data server provides assistance with the resolution of the mobile position,the mobile comprises means of communication with the server via a cellular network, said mobile comprising means for receiving positioning signals from a satellite positioning system (GPS, GNSS) using a technique of spread spectrum access, the method comprises:following the reception of the positioning signals, the mobile sends to the server a set of code phases corresponding to the acquired satellites, these code phases being dated by a single date information corresponding to the time of transmission of one of the phases code,the server derives from this information the transmission hours corresponding to these code phases and the pseudo-distances.the server resolves the position.