Research on spectrum correction algorithm based on coherent wind lidar

Abstract

Coherent wind lidar can detect atmospheric wind field information in real time and accurately. It plays an important role in military aviation applications, numerical weather prediction, meteorological climatology research, wind energy resource utilization and other fields.Coherent wind lidar is based on Doppler effect to realize wind speed measurement. Therefore, the estimation accuracy of Doppler frequency shift directly determines the performance of coherent wind lidar system.In this paper, after the FFT transform of the signal, the spectrum correction effect of the energy centrobaric correction method, the ratio correction method and the spectrum correction algorithm based on sinc function fitting is verified by simulation. Finally, the spectrum correction algorithm based on sinc function fitting is selected to correct the frequency of the measured Doppler signal. The correction effect of the algorithm is obvious, and the purpose of reducing the error and improving the analysis accuracy is achieved.