Analysis of Accuracy and Acquisition Rate of Doppler Lidar Multi-Beam Wind Measurement

As an effective detection tool for observing wind field information, a coherent Doppler lidar is widely used in wind field and atmospheric observations in different scenarios. In August 2019, researchers used the coherent Doppler lidar to continuously carry out a wind profile observation experiment for 13 d at the Shenzhen Shiyan Comprehensive Meteorological Observation Base. The similarity and difference of inversion results of the five-beam, three-beam, and two-beam methods in the Doppler beam scanning mode and the influences of these methods on wind measurement accuracy and data acquisition rate arc analyzed. The data comparison results show that the inversion results of the three-beam method and the two-beam method arc in good agreement with the results obtained by the five-beam method. In view of the low signal-to-noise ratio of individual beams caused by the system or atmospheric conditions, such as clouds, fog, and precipitation, in actual observation of the lidar, it is necessary to flexibly select the beams to invert the wind field and increase the data acquisition rate. The average increase in detection height obtained is 100-100 m.