现代电子技术2017，Vol.40Issue(21)：175-179,5.DOI:10.16652/j.issn.1004-373x.2017.21.046
基于扩展DFT的谐波检测算法的研究
Research on harmonic detection algorithm based on extended DFT
摘要
Abstract
The traditional discrete Fourier transform(DFT)algorithm has fast computational efficiency and is convenient to apply to the embedded system,which is widely used in the harmonic detection. However,the available spectrum leakage and picket fence effect may influence the accuracy of the measuring result under the condition of asynchronous sampling. The extended discrete Fourier transform (EDFT) algorithm is applied to the harmonic detection. Taking the Fourier integral transform as the target of EDFT algorithm,the transform basis is optimized within the extended frequency range,for which the index basis in tra-ditional DFT is replaced by the transform basis function to construct the target function of the signal. The original data is carried out with the iterative approximation fitting to improve the measuring accuracy. The simulation result shows that,under the condi-tions of asynchronous sampling and noise,the algorithm has high frequency resolution and strong anti-interference ability,and is suitable for the high-precision measurement or detection.关键词
非同步采样/DFT/扩展傅里叶变换/谐波检测Key words
asynchronous sampling/DFT/EDFT/harmonic detection分类
信息技术与安全科学引用本文复制引用
张静,赵庆生,王旭平,郭尊..基于扩展DFT的谐波检测算法的研究[J].现代电子技术,2017,40(21):175-179,5.基金项目
国家自然科学青年基金项目(51505317) （51505317）
山西省自然科学基金项目(2015011057) （2015011057）
