摘要
介绍了准同步离散傅里叶变换(discrete foruier transformation,DFT)算法的基本原理,同时对算法进行了计算机仿真,讨论了采样起始时刻和频偏对算法测量准确度的影响,并对DFT算法和准同步DFT算法进行了比较。得到结论:准同步采样与采样起点无关;被测信号频率在一定范围内变化不影响测量结果;在一定条件下,采用准同步DFT算法能够获得较高的测量准确度。
This paper introduces basic principle of discrete foruier transformation（DFT） algorithm and simulates on the algorithm.Besides,it discusses on impact of start-time and end-time of sampling as well as frequency deviation on measurement precision and compares DFT algorithm with quasi-synchronous DFT algorithm.It draws a conclusion that quasi-synchronous sampling has nothing related to sampling starting point;the measured signal frequency has no impact on measurement result in certain range;under some circumstances,high measurement precision can be acquired by adoption of quasi-synchronous DFT algorithm.
出处
《广东电力》
2012年第3期26-30,共5页
Guangdong Electric Power
基金
国家自然科学基金资助项目(51007058)
关键词
准同步DFT算法
采样起始时刻
频偏
仿真分析
quasi-synchronous DFT algorithm
starting and ending time of sampling
frequency deviation
simulation analysis
