Meinberg LANTIME/GPS Operating Instructions Manual page 66

Using the button "List detailed GPS information" gives you the possibility to check
detailed GPS status information. The first parameter indicates the time and date of the
last update of the shown parameters. Next you find the GPS receiver status and the
NTP status, followed by the GPS position data. The position uses the Latitude /
Longitude / Altitude format. Latitude and Longitude are shown in degrees, minutes
and seconds, Altitude is shown in meters above sea level.
The satellite section shows the numbers of satellites in view and the number of usable
satellites ("good SV"). Additionally, the selected set of the four used satellites can be
read.
The accuracy of the calculated receiver position and time deviation is dependent on
the constellation of the four selected satellites. Using the position of the receiver and
the satellites, a number of values can be calculated, which allow a rating of the
selected constellation. These values are called "Dilutions of Precision (DOP)".
PDOP is the abbreviation for "Position Dilution of Precision", TDOP means "Time
Dilution of Precision" and GDOP stands for "General Dilution of Precision". Lower
values are indicating better accuracy.
The next section "Satellite Info" shows information about all the satellites, which are
in view momentarily. The satellite ID, elevation, Azimuth and distance to the receiver
reveal the position of the satellite in the sky. The Doppler shows whether the satellite
is ascending (positive values) or descending (negative value).
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