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User Guide
44
You can also actively configure the xGenius GNSS receiver. Some settings are not
mandatory but the increase in accuracy it could be obtained in this way is quite
important. This is the required procedure:
1. From the Home panel, go to CONFIG,
The port setup panel is displayed.
2. Go to Reference clock.
3. Go to GNSS receiver.
4. Configure the Antenna cable delay to compensate for the distance between the
receiver and the antenna.
5. Optionally, enable or disable any of the GPS, GLONASS, BeiDou or Galileo con-
stellations through the Active GNSS setting.
6. Go to Fixed-position mode.
7. Optionally, adjust the Position averaging time and enable position averaging by
configuring Fixed-position mode to Auto-average.
The Fixed-position status field now displays Averaging
Note: At least one hour of position averaging is required for a reasonable accu-
racy.
Note: The position averaging procedure should be run only once as long as the
test unit geographical location is not changed. The unit checks any change in
position (longitude, latitude, altitude) every time it is connected to a GPS antenna.
If a change in the coordinates is detected, then an error message is displayed in
the status field and the mode is disabled.
8. Wait to the Fixed position status to become Active. The unit is now ready for test-
ing.
TDOP Time Dilution of Precision (TDOP). This parameter gives
information about how good is the current satellite geometry
to achieve an accurate time estimate.
Fixed-position mode This is the menu that enables the user to configure the fixed
GNSS receiver fixed position mode. In this mode the
equipment uses given spacial GNSS coordinates (longitude,
latitude, altitude) in order to achieve maximum accuracy in the
time estimate.
Leap seconds (TAI -
UTC)
Reports the current time offset between TAI and UTC. This
value is currently set (February 2019) to 37 seconds but this
value changes from time to time as new leap seconds are
added to the UTC time scale. The TAI to UTC offset is
retrieved from the GNSS constellations without user
intervention. This is, therefore a read only field.
Table 2.13: GNSS Receiver Options
Parameter Description
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