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14. GPS time synchronisation.
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If your system has a GPS option installed, then it is possible to choose to synchronise to the GPS signal every hour.
This feature will be useful when there is no network connection meaning that the regular network time sync software
(D4) is not able to work. D4 is loaded at Windows start up – so if it needs to be disabled, it will possibly also have to
be prevented from loading and running at boot.
The GPS time synchronisation option will synchronise the Lidar PC's internal clock to
UTC
during the backgrounding
process, which takes place every hour. If you have a local time zone set up on the Lidar, it will likely to be changed to
UTC if this option is selected.
If your system doesn't have GPS, then the option is not available, but can be retro-fitted if the system is returned.
Selecting hourly GPS time synchronisation.
This is chosen at set up time, or if the 'Change Lidar settings' button is pressed during data collection.
The chosen setting will be used the next time that the software starts up.
The GPS synchronisation will only take place if there are enough satellites in view in order to obtain a valid signal. A
file is generated to log synchronisation events and is stored in the monthly level of the data logging directory with the
file name structure - Time_Sync_SystemID_yyyymm.txt.
It is tab delimited ASCII – but shown as a list below:
Here is an example file:
System time before sync: 18/09/2013 13:30:24.485
System time after sync: 18/09/2013 13:30:24.469
Satellites in view: 05
Synchronisation performed: Yes
Lat: 52 10' 45.77"N
Long: 2 19' 47.26"W
Height (m): 00028.6
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