GPS File Naming Convention

NOAA post-fit ("precise") GPS orbit data, computed by the National Geodetic Survey, are available via anonymous ftp. The files are in UNIX-compressed format. The file-naming convention is as follows:

      ngsnnnnx.aaa,  where ngs = National Geodetic Survey
                           nnnn = GPS Week Number, e.g., 0745
                           x = day of week, Sunday = 0, ...,
                               Saturday = 6, weeklong = 7
                           aaa = file type, eph (SP3), sum, erp
                               (erp = earth rotation parameters)

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For a more complete explanation of GPS Orbital data files please read Information.

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