Use of a spatial GPS receiver in AMS-02 experiment

An important subject in AMS02 experiment would be to perform measurements of the arrival time of the photons on a scale of few μsec for the Transient Gamma Sources, mainly Pulsars, Blazars and Gamma Ray Bursts. This may be possible if each trigger correlated with a detected cosmic particle, acquires a precise time stamp provided by a spatial GPS receiver which will also be used to synchronize the internal clocks of the AMS-02 DAQ system.The TOPSTAR 3000 D GPS receiver characteristics are described. The built in procedures for the integration of the GPS module in the DAQ and Trigger systems are presented. The dependence on the flight orbit, ISS in case of AMS-02 mission is studied. In final, the monitoring requirements and the first results of tests are discussed.