The application of edge technique in wind lidar

The principle of single-edge technique and double-edge technique in the application of wind lidar was analyzed in detail, and the sensitivity and error of velocity measurement were discussed contrastively. The principle of single-edge technique is to compare the transmission of high resolution filter in two different frequencies. Double-edge technique lies in deducing Doppler shift as well as wind velocity value by comparing the intensity difference between two filters´ output signal. And Mie and Rayleigh backscattering signals can be measured separately via selecting special working point. The analysis indicates that the velocity measurement sensitivity of double-edge technique is twice as much as that of single-edge technique in the same measurement condition. Although signal beam splitting of double-edge technique impacts SNR (signal-to-noise ratio), the velocity measurement error is still higher than that of single-edge technique.