Spectracom PRISMA VelaSync User Manual page 147

4.
Enable A-GPS Client
This feature will schedule assistance data to be collected and updated every hour. On startup, if
data is present, it will be sent to the receiver.
Apply A-GPS Data
If this option is selected, VelaSync will immediately apply the time, position and satellite data to
the receiver once you click Submit .
Time and position are user-configurable via the next two menu options; VelaSync collects A-
GPS satellite data from an external source automatically.
Use Current System Time
Apply VelaSync's currently used System time to the GNSS receiver.
Set System Time
Enter a specific date and time, instead of the System time. This may be useful if the System time
is known to be incorrect, or if you need a time in the past or future e.g., for simulation pur-
poses. Enter the date and time by using the displayed calendar and time sliders.
Manual Position Set
By accurately entering latitude , longitude (both in decimal degrees), and altitude (in meters,
WGS-84) of your antenna, VelaSync can use this data during the satellite tracking/adjustment
process, which typically leads to a quicker "fix". It is recommended to enter the position as
accurately as possible. For more information, see "Manually Setting the GNSS Position" on
page 128.
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3 VelaSync User's Manual Rev. 1
Note: The options displayed on your screen depend on your system con-
figuration.
Configure the menu options as required:
Note: Once you click
will override the System time and position data. Exercise caution when using this
feature, since it could negatively impact the GNSS receiver operation.
When manually setting a position, VelaSync must be in one of the sta-
Note:
tionary modes, Standard
Submit , any parameters entered under
or Single Satellite (see "Receiver Mode" above).
3.3 Managing References
Apply A-GPS Data
135