数据采集与处理2009，Vol.24Issue(6)：772-776,5.
谐波法复杂周期信号周期测量
Period Measurement of Complicated Periodic Signal Using Harmonic Wave Method
摘要
Abstract
The spectrums of the complicated periodic signals include many harmonic componcnts and their amplitudes are fluctuant.Based on the feature.the period measurement by the harmonic wave method is proposed for the complicated periodic signal.One of the harmonic wave methods,FT-Abs-IFT(FAIF),iS the inverse Fourier transform(IFT)of the spectrum envelope.Then,the output signal is the convolution of the spectrum envelope time domain signal and the periodic impulse signal.The maximum of the convolution output is also the periodic impulse signal with constant amplitude under the noise-free condition,or fluctuant amplitude under the noise condition.The signal period(or frequency)can be obtained by the threshold detection and the period measurement.The simulation comparisons of the harmonic wave method and conventional methods(including homomorphic filtering,autocorrelation and average magnitude difference function(AMDF))are given.The result indicates that the FAIF has high measurement precision,lower error rate,and fine anti-noise performance for period measurement of the complicated periodic signal.关键词
周期信号/谐波法/FT-Abs-IFT(FAIF)/自相关/平均幅度差函数(AMDF)Key words
periodic signal/harmonic wave method/FT-Abs-IFT(FAIF)/autocorrelation/average magnitude difference function(AMDF)分类
信息技术与安全科学引用本文复制引用
李文臣,丹梅,王雪松,王国玉..谐波法复杂周期信号周期测量[J].数据采集与处理,2009,24(6):772-776,5.基金项目
国家自然科学基金(60875019)资助项目 （60875019）
国防科技大学科研计划(JC06-04-01)资助项目. （JC06-04-01）
