To improve the met mast lidar measurements and accuracy, Leice had developed multiple scanning modes applied for different lidars. There’s an experiment conducted to compare the wind retrieval methods of VT (Virtual Tower) mode and VAD (Velocity-Azimuth Display) with different scanning elevation angles. The field experiment was performed from September 23 to October 13 2017 at the campus of Ocean University of China under various weather conditions. A total of seven lidars were involved in the experiment. Three lidars carried out the staring mode to constitute the VT. The other four lidars were concurrently operating PPI scanning at different elevation angles, corresponding to different spatial average volume. The results of wind speed and direction from VT and VAD shows good correlation when lidars are well synchronized.

“Comparison of wind measurements between virtual tower and VAD methods with different elevation angles” - This paper introduces the synchronous observation experiments of seven lidars. The comparison between VT and VAD shows good agreement. The volume average effect is also analyzed theoretically. In the next work, it is also necessary to analyze the influence on the actual wind field with measurement data. The time series analysis indicates that VT and VAD have the same tendency. The study contributes to the wide application of met mast lidar.

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