离散频谱的频率抽取校正法

在对几种现有的离散频谱校正的方法作了综合分析和回顾的基础上,对现有的频谱校正方法进行了改进,提出了一种新的校正方法——频率抽取校正法,通过抽取幅值谱中最大谱线处的频率成分来确定信号分量的频率,采用最小二乘拟合法修正其幅值和相位,如此循环抽取和修正即可逼近原始信号。仿真结果表明,该方法提高了离散频谱校正的精度,且实现方便,适用于一般的工程平稳信号处理。

A CORRECTING METHOD OF A DISCRETE SPECTRUM BY EXTRACTING FREQUENCIES

On the basis of reviewing and comprehensively analyzing the characteristics of four correcting methods on a discrete spectrum,a new improved method,the extracting frequencies correcting method,is presented to improve the correcting precision of a discrete spectrum.With the method,a curve can be fitted close to the original signal by circularly extracting the frequency of maximum magnitudes and amending its magnitudes and phases with the least square approximation.simulation results demonstrate that this method is easily carried out with higher precision,applicable for all kinds of engineering stationary vibration signal processing.