Spectracom NetClock 9489 - Manually Setting the GNSS Position

Note: In Mobile Receiver Mode it is NOT possible to delete the position and start
the GNSS survey. This feature is only available in Standard Mode and in Single
Satellite Mode. In Single Satellite Mode a GNSS survey may take up to 24 hours.
3.3.3.9 Manually Setting the GNSS Position
The exact geographic position (location and elevation) of the antenna your NetClock unit—and
thus its onboard GNSS receiver—is a major factor for NetClock to calculate an accurate Sys
tem Time from the GNSS reference.
Note: The elevation (altitude) should be set in accordance with the World Geo
detic System 1984 (WGS84), not Mean Sea Level (MSL).
Normally, the onboard GNSS receiver will track and adjust the antenna position during the so-
called GNSS self survey, which is performed during initial commissioning of a NetClock unit,
or when rebooting a unit after it had been powered down for some time ("cold start").
Depending on where your GNSS antenna is installed and thus, how good the reception is, the
self survey may be adequate for most applications.
Setting a Manual Position, however, i.e. manually applying your current geographic position
data (Latitude, Longitude, and Altitude) may be necessary if your GNSSreceiver could not com
plete its survey due to poor reception.
In some cases, setting the position manually may also help to reduce the amount of time needed
for the initial position "fix", i.e. for NetClock to synchronize with the satellites in view.
Note: When manually setting a position, NetClock must be in one of the sta
tionary modes, Standard or Single Satellite (see "Selecting a GNSS Receiver
Mode" on page189).
Note that this position will also be used if Apply A-GPS Data is checked.
To manually set your position:
1.
Determine your geographic position. For more information, see "Determining Your Pos
ition" on the next page.
2.
Navigate to INTERFACES > REFERENCES: GNSS0. In the GNSS0 status window, click
Edit in the lower left corner. The GNSS0 window will open:
3.3 Managing Input References
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