电工技术学报2012，Vol.27Issue(10)：190-195,214,7.
基于三线DFT的航空电源频率实时检测算法
Real-Time Frequency Estimation of Aircraft Power Source Based on 3-Line DFT
摘要
Abstract
A real-time frequency estimation algorithm based on 3-line discrete Fourier transform(DFT) is presented in this article for variable frequency measurement in aircraft power system.The signal is firstly weighed by means of Hanning window,and the spectrum amplitude in main lobe area is calculated via DFT.The numerical value relation between fundamental frequency and 3-spectrum amplitude is then derived.According to the features of power system,the number of samples in the algorithm is determined,which has no main lobe spectrum leakage.The spectrum amplitude is extracted in rotating reference frame to effectively reduce the computation effort.Iterative calculation of initial frequency is introduced to perform continuously long-range frequency estimation with no fence effect.Simulation and experimental results show that the proposed technique can simultaneously track the frequency with fast step response and high steady-state accuracy.关键词
频率检测/离散傅里叶变换/汉宁窗/频谱分析Key words
Frequency estimation/discrete Fourier transform/Hanning window/spectrum analysis分类
信息技术与安全科学引用本文复制引用
肖鲲,王莉娜,M.Khurram Shahzad..基于三线DFT的航空电源频率实时检测算法[J].电工技术学报,2012,27(10):190-195,214,7.基金项目
国家自然科学基金 （）
航空科学基金（2008ZC51045）资助项目 （）
