一种高精度单频信号频率估计算法  

An Accurate Frequency Estimation Algorithm for Single Complex Sinusoid Signal

作　　者：刘建林[1] 陈兵[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2011年第4期26-28,共3页Radio Engineering

摘　　要：根据离散傅里叶变换(DFT)理论和其系数的特点,提出了一种信号离散傅里叶变换系数来构造频率修正项的单频信号频率估计算法。算法利用峰值及前后1个位置的DFT变换系数得到频率修正项的初始值,再迭代计算修正后峰值前后位置的DFT系数来得到频率修正项的精细值。理论分析和仿真结果表明,算法在低信噪比下具有好的频率估计精度并能减少迭代次数。Based on Discrete Fourier Transform and its coefficients,a novel technique is presented in this paper for frequency estimation of single complex sinusoid signal using Fourier coefficients.Firstly,an initial residual is computed by three Fourier coefficients which are respectively at peak and at bin edges,and then a fine residual is achieved by iteratively calculating the DFT coefficients near the peak.Theoretical analysis and simulations show that this algorithm has the good frequency estimation performance in case of low SNR and requires less iteration.

关 键 词：频率估计 离散傅里叶变换 傅里叶系数 

分 类 号：TN971.1[电子电信—信号与信息处理]