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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。
Pulse coherent wind laser lidar echo within the door with high frequency, wide bandwidth, sampling points and other sparse. With traditional signal processing methods, the radar spectral resolution is difficult to improve. On the basis of studying the spectrum refinement technology of radio radar signal, the method of combining Zoom FFT spectrum with digital filter bank is adopted. The simulation results show that this method has good effect on improving the spectral resolution of pulsed coherent laser wind measurement radar. The article introduces the principle of Zoom FFT algorithm and digital filter bank, simulates the low-frequency and high-frequency signals, and verifies it with the real wind field data. It proves that this algorithm is very effective for improving the spectrum of pulse coherent laser wind radar The validity of the resolution.