The Research On Scan Mode And Algorithm In Coherent Wind Lidar System

Coherent wind lidar system can get Doppler frequency shift information of the echo light by using of heterodyne testing technique. Then calculate the radial velocity of wind field tracer based on Doppler principle. Wind lidar can provide the distribution of aerosols, and variability of wind fields. Furthermore, it is the only effective method to measure wind speed with the three-dimensional atmospheric wind fields.The theory to measure the wind of coherent wind lidar is introduced in this thesis, and its signal detection is analyzed. Then the echo signal is simulated through MATLAB and processed by FFT and window functions. The results show that, the Signal to Noise Ratio is raised with the increasing of FFT points, and window functions can be used to promote the processing capacity to weak signal. According to the research on coherent wind lidar system and variation tendency of wind with the height, two scanning modes are designed, conic fixed-point scanning mode and single-point measurement. Based on wind data from one wind field, the applicability of the single point measurement and conic fixed-point scanning at varying heights by data calculation and error analysis is verified.