基于FRFT的风廓线雷达间歇杂波抑制

风廓线雷达回波信号中的间歇强杂波严重干扰了大气湍流回波信号的识别和频谱估计。为了抑制该类杂波,提出了基于分数阶Fourier变换（FRFT）的杂波抑制方法,该方法利用间歇强杂波在分数阶Fourier频率域的能量聚集特性,通过窄带带阻滤波器在分数阶Fourier频率域滤除杂波,且对杂波滤除后的信号进行时域重构进而得到杂波抑制后回波信号的频谱图。与未进行杂波抑制回波信号的频谱图相比,间歇杂波部分被抑制明显。理论及仿真实验结果证明了该方法的有效性。

Intermittent Clutter Removal from Wind Profiler Signals Based on Fractional Fourier Transform

Intermittent intensity clutter in wind profiler radar signals severely interferes with the identification and spectrum estimation of atmospheric echo signals.In order to remove such clutter,a method based on fractional Fourier transform is presented.The method makes use of energy concentration property of intermittent clutter in fractional Fourier frequency domain.Not only the intermittent intensity clutter can be removed in the fractional Fourier frequency domain by using of narrowband band-stop filter,but also the atmospheric signal in the time domain can be reconstructed after removing the clutter.Compared with the spectrum of echo signals without removing clutter,the intermittent clutter is obviously removed in the spectrum with clutter removed.Theory and computer simulations have verified the effectiveness of the method.