Meinberg GPS167TGP, Operating Instructions Manual

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Menu RECEIVER POS.
This menu shows the current receiver position. The NEXT key lets the user select one
of three formats. The default format is geographic latitude, longitude and altitude with
latitude and longitude displayed in degrees, minutes and seconds. The next format is
geographic, too, with latitude and longitude displayed in degrees with fractions of
degrees. The third format displays the receiver position in earth centered, earth fixed
coordinates (ECEF coordinates). The three formats are shown below:
Menu SV CONSTELLATION
The SV constellation menu gives an overview of the current satellites (SVs) in view.
The second line of the display shows the number of satellites with an elevation of 5° or
more. The third line gives the number of satellites that can be used for navigation
whereas the last line shows the selected set of satellites which are used to update the
receiver position.
The precision of the computed receiver position and time is affected by the geometric
constellation of the four satellites beeing used. A set of values called dilutions of
precision (DOP) can be computed from the geometric constellation. Those values can
be displayed in a submenu of the SV constellation menu. PDOP is the position dilution
of precision, TDOP is the time dilution of precision, and GDOP, computed from the
others above, is the general dilution of precision. Lower DOP values mean more
precision.