Matlab仿真中变步长数据的FFT频谱分析  

FFT Spectrum Analysis of Variational Step Data in Matlab

作　　者：方芳[1] 王铁军[1] 陶兴华[1] 姜小弋[1] 

机构地区：[1]海军工程大学电气工程学院,湖北武汉430033

出　　处：《电气电子教学学报》2014年第2期115-117,共3页Journal of Electrical and Electronic Education

摘　　要：Matlab仿真输出的结果在很多情况下是变步长的时域信号,这时如果直接调用FFT函数对仿真结果进行频谱分析,结果往往是不准确的。本文针对这一情况,提出一种简单实用的方法:首先对变步长数据进行插值重构,变为等步长采样数据,再调用FFT进行频谱分析,则可以得到正确的结果。文中通过仿真实例验证了该方法的准确性。The simulation results in Matlab are always variational step data. For these data, it is difficult to get a correct result when analyzing their spectrum by FFT. A simple and practical method of interpolation is proposed to resolve the problem. By interpolation, the variational step data is reconstructed to be fixed step data. And then FFT spectrum analysis is effective and correctly. It is verified by an example of simulation finally.

关 键 词：MATLAB FFT 插值 

分 类 号：G420[文化科学—课程与教学论]