摘要
快速傅里叶变换(FFT)是主要的激光多普勒测速系统信号处理方法,由于受到频谱泄露和栅栏效应的影响,其处理精度并不理想。基于Nuttall窗三谱线插值法的激光多普勒信号处理方法就是一种好的处理方法,它可以有效地抑制频谱泄漏和栅栏效应,改善信号分析精度,提高速度测量精度。由于Nuttall四项余弦窗的能量集中在主瓣,旁瓣非常小,因此加Nuttall四项余弦窗的FFT三谱线插值算法能够极大地减小频谱泄漏的影响,谱间干扰也很小,能很好地减小频谱泄漏和栅栏效应。
Fast Fourier transform（FFT）is a commonly used method of laser Doppler signal processing.Due to the influence of spectrum leakage and fence effect,the processing precision of FFT is not ideal.Nuttall window three spectral line interpolation method of laser Doppler signal processing method is a good treatment method,it can effectively suppress the spectral leakage and fence effect,improve the accuracy of signal analysis,improve the accuracy of speed measurement.Since the Nuttall four item cosine window energy concentrated in the main lobe,side lobe is very small,so Nuttall four cosine window three FFT spectral line interpolation algorithm can greatly reduce the influence of frequency spectrum leakage,spectrum interference is very small,can effectively reduce the spectrum leakage and fence effect.
出处
《光学技术》
CAS
CSCD
北大核心
2017年第4期369-373,共5页
Optical Technique
关键词
快速傅里叶变换
栅栏效应
频谱泄漏
插值
fast Fourier transform
fence effect
spectral leakage
interpolation
