提高谐波参量测量精度的谱泄漏相消算法

Spectral Leakage Canceling Algorithm for Improving Precision of Harmonic Analysis

提出一种能有效提高谐波参量测量精度的新算法.该法通过两个采样起点约间隔半个信号周期的采样数据作加窗傅里叶变换,并利用它们将谱泄漏抵消,从而有效地改善谐波分析的精度.所提出的方法适用于任何形式的对称窗函数.理论分析与数值模拟结果均表明:该算法可显著提高容易被强谐波所掩蔽的弱谐波的谱分析精度从而提高谱分析的整体测量精度.

We propose a novel algorithm that can effectively reduce the errors of the harmonic parameters estimates of a periodic signal by counteracting the special leakage of the windowing FFT of two sampling data sequences, which stagger about half period. Proposed algorithm can be applied to any window function with central symmetry. Theory analysis and simulation results show that the algorithm can significantly improve the precision of harmonic parameter estimates.