Safran VersaSync - Performing a GNSS Receiver Survey

3.3.3.5 Performing a GNSS Receiver Survey
Note: This topic only applies to stationary applications – in Mobile
receiver mode NO surveys will be carried out since the position is
updated continuously.
When VersaSync's integrated GNSS receiver performs a survey, it tries to determ-
ine or verify its geographic position with high accuracy. An accurate geographic
position is required to calculate a precise system time from the GNSS reference.
During a GNSS survey, the position will be iteratively recalculated while gradually
increasing the position accuracy. A survey can take up to 33minutes, but typ-
ically VersaSync will synchronize earlier, i.e. offer a valid Timeand 1PPS reference,
once it has obtained a sufficiently accurate preliminary position.
Note: If a system has been moved, in Standard receiver mode and
Land Dynamics, receivers will automatically re-survey on reboot. In
Standard mode and Stationary Dynamics, the unit will survey only
once, and will not re-survey on reboot.
Initiating a GNSS Survey
The standard behavior is that a power cycle or a reboot will automatically initiate
a GNSS survey. To reboot your unit, navigate to TOOLS > SYSTEM: Reboot/Halt.
While it is crucially important to carry out a resurvey after a unit has been relo-
cated (e.g., when commissioning a new unit), a resurvey is normally not required
if a stationary unit is rebooted for other reasons. To turn off this functionality, see
"Setting GNSS Receiver Dynamics" on page203.
Verifying GNSS Survey Progress
To see if VersaSync's GNSS receiver is performing a survey and if so, verify its pro-
gress:
1. Navigate to INTERFACES > REFERENCES: GNSS 0.
2. The survey status (ACQUIRING, COMPLETE, or progress in percent) is dis-
played under the line item Survey Progress.
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CHAPTER 3 • VersaSync User Manual Rev. 12
3.3 Managing References