32nd Annual Precise T ime and Time Interval (PTTI) Meeting ONE-WAY GPS TIME TRANSFER 2000

On 1 May 2000, the White House issued a presidential directive for the Global Positioning System (GPS) to turn 08 Selective Availability (SA) on 2 May 2000. For nearly a decade, authorized user performance of one-way synchronization via GPS has improved every single year. This paper provides an annual assessment of how well the Global Positioning System can predict and disseminate UTC (USNO) to these specified users, based on data generated and processed by the United States Naval Observatory (USNO). And, because the recent Presidential directive now permits civilian timing users to exploit nearly the same, impressive time transfer accuracy of GPS, these annual metrics now oaer a fairly representative performance assessment for both military and civilian timing users