基于数据延拓的FFT频率估计方法  

FFT frequency estimation method based on data extension

作　　者：沈廷鳌 周毅 罗媛媛 黄思宇 SHEN Tingao;ZHOU Yi;LUO Yuanyuan;HUANG Siyu(Army Logistics Academy of PLA,Chongqing 401311,China)

机构地区：[1]陆军勤务学院,重庆401311

出　　处：《自动化与仪器仪表》2022年第10期5-8,共4页Automation & Instrumentation

基　　金：重庆市自然科学基金项目资助(cstc2019jcyj-msxmX0628);重庆市教委科学技术研究项目资助(KJQN202112902)。

摘　　要：针对传统FFT方法存在频率估计精度不高的问题,首先进行了误差分析,针对方法存在的非整周期采样问题,提出了一种抑制非整周期采样的数据延拓处理办法。采用传统FFT法预估信号频率,再对信号进行周期延拓处理,然后再运用FFT法,进而可实现频率的准确估计。详细阐述了改进措施的具体实现过程,并对方法改进前后的性能进行了仿真比较分析,以证实改进措施的有效性。Aiming at the poor precision problem in frequency estimation methods based on traditional FFT,the error of the estimation method is firstly analyzed.In order to improve the performance of the estimation method under the non-integer period sampling conditions,a restrain measure is introduced in this paper.At first,the traditional FFT method is used to estimate the coarse signal frequency.Then,the signal is processed by period extension.At last,the FFT method is used to estimate the frequency accurately.The particular implement process is expounded.simulation results verify the advantages of the method,along with the contrast analysis of the original and the revised method,which validated the effects for the revised measure.

关 键 词：频率估计 FFT 数据延拓 非整周期采样 

分 类 号：TP14[自动化与计算机技术—控制理论与控制工程] TN911[自动化与计算机技术—控制科学与工程]