电测与仪表2017，Vol.54Issue(16)：32-38,7.
基于加窗傅里叶变换的相位误差研究
Study on phase error based on windowed fourier transform
摘要
Abstract
In order to improve the speed of harmonic measurement on the premise of known phase accuracy requirement, quantitative analysis of phase error based on WFFT, the formula between phase error and window period number, sampling signal frequency, and initial phase is deduced.On this basis, a method which finds the optimal window length according to the accuracy demand in actual phase measurement is proposed.The formula of the relationship between the sampling frequency / window length and the phase error is fitted, and the minimum window length can be determined by the phase error precision, so as to improve the speed of harmonic measurement.The fixed side lobe attenuation rate makes the phase error range the most accurate.Simulation results show that the known initial conditions and error accuracy requirements of the premise, a window of the length of the shortest and most suitable side lobe decay rate can be found, so that the fastest harmonic measurement can be achieved.关键词
相位误差/窗口长度/旁瓣衰减率/测量速度/WFFTKey words
phase error/window length/side lobe attenuation rate/measurement speed/WFFT分类
信息技术与安全科学引用本文复制引用
许仪勋,杨晓光,朱奕帆,林顺富..基于加窗傅里叶变换的相位误差研究[J].电测与仪表,2017,54(16):32-38,7.基金项目
国家自然科学基金资助项目(51207088) （51207088）
