Using Zoom FFT to improve the spectrum resolution of coherent wind laser radar

Pulse coherent laser radar has the characteristics of high frequency, wide frequency band, sparse sampling points of the echo in the range gate. It is difficult to use the traditional signal processing methods to improve the radar spectrum resolution. Based on the study of radio radar signal spectrum technique, the Zoom FFT method was used combining with the digital filter banks. Through the simulation experiment, it is showed that the method for improving the pulse coherent laser radar spectral resolution have good results. The principle of Zoom FFT and digital filter banks was introduced, and it is proved that this algorithm is effective to improve the spectrum resolution through the simulation of low- frequency and high-frequency signal. The idea is also verified by the real wind data.