You are here: Home USNO Precise Time GPS USNO GPS Data Categories Explanation

USNO GPS Data Categories Explanation

USNO GPS Data Categories Explanation

 

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

 

 

USNO Master Clock Time
Javascript must be Enabled