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International time / frequency comparisons using GPS carrier phase measurements

Time transfer experiments were conducted using the Ashtech Z12T receivers, whose internal frequency is provided by an external 20 MHz clock and an external 1 pps of a reference clock. The self-developed processing software was used to analyse the GPS data for the carrier phase time transfer. Time transfer experiments between Korea Research Institute of Standards and Science(KRISS) and National Institute of Information and Communications Technology(NICT, Japan) and those between KRISS and National Physical Laboratory(NPL, UK) respectively were carried out using GPS carrier phase time transfer. The results of time comparison has shown that the precision of time transfer using carrier phase is about an order of magnitude better than that of GPS common-view time transfer. And the time transfer using carrier phase measurements were compared with the two-way time transfer via JCSAT-1B communication satellite. The results using carrier phase are comparable to what can be made using two-way satellite time and frequency transfer(TWSTFT). We will use the geodetic receiver as well as the TWSTFT system for international time and frequency comparison.