摘要
同频周期信号的相位差等于两个信号的初相差。文中给出了一种基于谐波叠加和牛顿迭代运算的周期信号初相计算方法,进而引入准同步DFT非整数修正算法,并提出一种新的相位差测量方法。该方法如下:(1)同步采样被测周期信号的波形数据;(2)应用准同步DFT非整数修正算法获得高精度的谐幅值和谐相角;(3)应用初相计算方法计算各自的初相;(4)计算相位差。仿真实验结果表明该方法可用于满足狄里赫利条件波形的相位差测量,频率漂移适应范围宽,测量精度高。
As we all know, the phase difference of two same frequency periodic signals equals to their initial-phase difference. For this reason, we give an initial-phase calculation method （IPCM） which is based on harmonic superpo- sition theory and the Newton iteration algorithm. The non-integer phase difference measurement （NI-PDM） method by initial-phase is as follows ： （ 1 ） Synchronous sampling the waveform data of two periodic signals ; （2） Getting high- precision amplitude and phase of each harmonic by using the non-integer harmonic analysis algorithm （NI-DFT） ; （3） Calculating initial-phase respectively by IPCM; （4） Calculating the phase difference. Simulation results show that this method has a wide range of signal ence of waveform which meets the frequency drift and a high-precision, Diliheli conditions. and can be used to measure the phase differ-
出处
《电测与仪表》
北大核心
2015年第23期76-80,85,共6页
Electrical Measurement & Instrumentation
基金
常州市科技计划项目(CC20130029)
关键词
相位差测量
周期信号
谐波分析
初相
非整数谐波分析
phase differential measurement；periodic signal；harmonic analysis；initial phase；NI-DFT
