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9.1.2 Stare coordinates
The stare co-ordinates are used by default when the Lidar software is started and when no other scans are being
executed. If no other scanning is set, the Lidar will continue to use the stare coordinates for data collection. A suitable
staring position can be entered into the Az and El fields.
9.1.3 VAD scans.
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To add a VAD scanning routine to the current schedule, the VAD is button is pressed. The various options for the VAD
scan are selected by altering the editable (yellow) boxes.
In the example above, the scan schedule would be set as follows:
•
On main system start up, (for example the time is 09:40) data would be collected with the beam set to the
vertical position until 09:50.
•
At 09:50, a VAD scan would be performed consisting of 8 rays at 75 degrees elevation from horizontal with 45
degrees in azimuth between them. The first ray would be at 0 degrees in azimuth, the next at 45 degrees and
so on.
•
After the VAD scan is finished, (the time is now approximately 09:50:30), the system goes back to staring
vertically until ~ 10:00.
•
The repetition time is counted from the beginning of a scan file to the next beginning, and not from when a
scan finishes. E.g. 10-minute repeats with a scan duration of 2 minutes will produce a scan every 10 minutes
– not every 12 minutes.
9.1.4 Wind profile.
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The wind profile pattern performs a 6 point VAD scan at a selected elevation angle. Azimuth beams will be 0°, 60°,
120°, 180°, 240° and 300°. The system will need to be correctly orientated, or else a direction offset will apply to the
results of the wind profile.
The options available for the wind profile scan are to set the elevation angle (from horizontal) and the number of rays
averaged for each position.
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