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In this paper the noise characterization of the GPS receivers (both timing and geodetic) hosted at the Time and Frequency Laboratory of the Istituto Elettrotecnico Nazionale (IEN) "Galileo Ferraris" was taken into account. In particular, a specific algorithm as well as two different approaches (a classical GPS "common view" technique and a geodetic- based Precise Point Positioning, PPP) employed to process the data coming from such receivers were described. Moreover, the paper focused on the preliminary timing performance of the PPP geodetic method by comparing them with the International GPS Service (IGS) estimates on the link between two European metrological institutes, such as IEN and PTB (Physikalisch-Technische Bundesanstalt), Braunschweig, Germany.