USNO GPS Data Categories Explanation

USNO GPS Data Categories

 

Column
  Data Category
   Explanation
1
  PRN
   the satellite vehicle PRN number
2
  MJD
   the five digit Modified Julian Date and the fraction of day at the midpoint of the track
3
  BGTK
  HHMM
   hour and minute (in UTC) of the start of the track
   tracks begin at 1 second after the minute
4
  TRK
  SEC
   the track length in seconds (a full track is 780 seconds)
5
  MC-GPS
  NS
   the time difference (measured in nanoseconds) between UTC(USNO MC) and GPS time, referred to the midpoint of the pass via a linear fit
6
  SLOPE
  PS/S
   the slope determined via the linear fit to produce MC-GPS (measured in picoseconds per second)
7
  RMS
  NS
   the root mean square of the residuals of the linear fit used to produce MC-GPS
8
  SAMP
  N
   the number of data points used in the fit to produce MC-GPS
9
  EL
  DG
   the elevation (in degrees) of the satellite at the midpoint of the track (data prior to MJD 50846 gives elevation at beginning of track)
10
  AZM
  DEG
   the azimuth (in degrees) of the satellite at the midpoint of the track (data prior to MJD 50846 gives azimuth at beginning of track)
11
  ION
  NS
   the modeled ionospheric delay (measured in nanoseconds) referred to the midpoint of the pass via a linear fit
12
  MC-SATCL
  NS
   the time difference (measured in nanoseconds) between UTC(USNO MC) and satellite time, referred to the midpoint of the pass via a linear fit
13
  SLOPE
  PS/S
   the slope determined via the linear fit to produce MC-SATCL (measured in picoseconds per second)
14
  TROP
  NS
   the modeled tropospheric delay (measured in nanoseconds) referred to the midpoint of the pass via a linear fit
 
 
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