Ultras

USNO ULTRA-RAPID PRODUCTS
  • Files available:
    • GPS-satellite orbit + clock files (IGS .sp3 format)
    • Earth-orientation files (IGS .erp format)
       
  • Each file provides 48 hours of solutions:
    • 24 hours of post-processed solutions
    • 24 hours of predictions
    • These files are also available via anonymous ftp at ftp://maia.usno.navy.mil/GPS/ultras/
       
  • File name indicates center date/time of 48-hr span
    • before date = post-processed
    • after date = predict
       
  • Frequency/latency: produced every six hours, available three hours after center epoch.
     
  • File names (by example):
     
    • usu15002_18.sp3: 48-hr orbit/clock file with center date GPS week 1500, day 2 (Tuesday), hour 18 (GPST)
      • general format: usuwwwwd_hh.sp3
         
    • Similarly, usu15002_18.erp
 
To learn more about these products, click here.
 
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