应用Zoom FFT方法提高相干测风激光雷达频谱分辨率

脉冲相干测风激光雷达距离门内的回波具有中频高、频带宽、采样点稀疏等特点。采用传统的信号处理方法， 雷达频谱分辨率很难提高。在研究无线电雷达信号频谱细化技术的基础上， 采用Zoom FFT 频谱细化结合数字滤波器组的方法， 通过仿真研究验证了该方法对提高脉冲相干激光测风雷达的频谱分辨率具有良好效果。文章介绍了Zoom FFT 算法和数字滤波器组的原理，对模拟低频和高频信号进行了仿真，并且利用真实风场数据进行了验证，充分证明了该算法对于提高脉冲相干激光测风雷达的频谱分辨率的有效性。

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.