摘要
从相关函数的基本原理出发,分析了频率偏移对信号测量准确度的影响。理论分析和仿真实验结果表明,在信号频率偏离额定基波频率时,用相关函数法计算引起的测量误差与频率偏差的大小、信号的初始相位和信号间的相位差有关。基于这个误差特性,将相关函数测量法引入到电流互感器校验中,可以分析当互感器的精度满足准确级要求时,由数字相关法带来的测量误差是微小的。
According to the fundamental principle of correlation function,the effe ct of measuring accuracy resulting from frequency deviation is analyzed in this paper.The results of theoretical analysis and simulation indicate that the error values measured by the method of correlation function are related with the freq uency deviation and signal initial phases and phase displacement when the freque ncy deviates the rating frequency. If the measurement method of correlation func tion is introduced into error calibra...
出处
《电测与仪表》
北大核心
2004年第2期11-13,共3页
Electrical Measurement & Instrumentation
关键词
相关函数
频率偏移
误差校验
相位差
correlation function
frequency deviation
error calibration
phase displ acement
