现代雷达2025，Vol.47Issue(6)：56-61,6.DOI:10.16592/j.cnki.1004-7859.20231121001
基于全相位FFT双谱线插值的频率估计算法
A Frequency Estimation Algorithm Based on All-phase FFT Bispectral Line Interpolation
摘要
Abstract
Fast and effectively estimating the frequency of sinusoidal signals plays an important role in fields such as radar signal processing,communication,power grid harmonic detection and electronic countermeasures.The existing all-phase interpolation it-erative frequency estimation usually uses the spectral line interpolation of half frequency resolution on both sides of the all-phase FFT(apFFT)spectral center line directly.When the frequency of the interpolated spectral line is much different from the true fre-quency,the amplitude of the spectral line is small,resulting in a large estimation error at low signal-to-noise ratio.In this paper,an improved all-phase interpolation method is proposed,which uses the apFFT spectrum for bispectral line interpolation,and uses the two spectral lines with the highest amplitude as the amplitude ratio to derive the relationship between frequency offset and am-plitude ratio,thereby obtains the frequency estimation.Simulation results show that compared with the all-phase interpolation itera-tive algorithm,the proposed method has better stationarity and smaller error in estimation root mean square error under different frequency biases,and the frequency estimation performance approaches the Cramer-Rao lower bound at high signal-to-noise ratio.关键词
全相位快速傅里叶变换/频率估计/双谱线插值/信号处理/频谱Key words
all-phase fast Fourier transform(apFFT)/frequency estimation/bispectral line interpolation/signal processing/fre-quency spectrum分类
电子信息工程引用本文复制引用
廖仕杰,张红梅..基于全相位FFT双谱线插值的频率估计算法[J].现代雷达,2025,47(6):56-61,6.基金项目
广西自然基金重点资助项目(2020GXNSFDA238001) （2020GXNSFDA238001）
认知无线电与信息处理省部共建教育部重点实验室(桂林电子科技大学)资助项目(CRKL200101) （桂林电子科技大学）
