PPT Slide
? NGS is one of the seven International GPS Service (IGS) Analysis Centers (AC) participating in the production of accurate GPS orbits:
? Final Precise (~ 13 days latency) [ɝ cm]
Clock estimates [0.1-0.2 nanoseconds]
? Rapid (14 hours latency) [ cm]
? Ultra-Rapid (supports real-time) [ញ cm]
? Satellite positions in SP3 format are given (once every 15 minutes) in current ITRFxx frame
NGS Satellite Ephemerides
http://www.ngs.noaa.gov/GPS/GPS.html