Fig. 1. An example of the variance of function J(θ1,θ2) with parameter θ1 and θ2

Fig. 2. Flow chart of the wind retrieval method of VAD based on conjugate gradient algorithm

Fig. 3. Schematic of the relative position of lidar and anemometer. (a) Lateral view; (b) top view

Fig. 4. External view of WindPrint S4000 coherent Doppler lidar

Fig. 5. (a) A100L2 wind speed measuring instrument; (b) W200P wind vane

Fig. 6. Measurement data (squares) and algorithm result (curve) of Doppler lidar

Fig. 7. Comparison of Doppler lidar and anemometer. (a) Wind direction; (b) wind speed

Fig. 8. Comparison of scatter plot of 10 min data measured by Doppler lidar and anemometer. (a) Wind direction; (b) wind speed