基于改进Chrip-Z变换的高精度频率估计算法  

High-Precision Frequency Estimation Algorithm Based on Improved Chrip-Z Transformation

作　　者：朱颖洁 张武雄[1] 易辉跃[1] 许晖[1] ZHU Yingjie;ZHANG Wuxiong;YI Huiyue;XU Hui(Key Laboratory of Science and Technology on Micro-System,Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences,Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海微系统与信息技术研究所微系统技术实验室,上海200050 [2]中国科学院大学,北京100049

出　　处：《电子科技大学学报》2024年第4期525-532,共8页Journal of University of Electronic Science and Technology of China

基　　金：中国科学院青年创新促进会(2020239);上海市2020年度“科技创新行动计划”基础研究领域项目(20JC1416504)。

摘　　要：为解决栅栏效应对频率估计精度的影响,提升频率估计的精度和抗噪性能,提出了一种基于改进Chrip-Z变换(CZT)的高精度频率估计算法。将频率估计的过程分成粗估计和细估计两个过程,使用FFT算法对信号进行频域分析,获得信号频率粗估计值,基于信号频率的粗估计值确定频率的细化区间,使用CZT算法对该区间的频谱进行细化,使用细化后频谱最大谱线及其左右谱线的幅值对频率估计值进行修正,得到精确的频率估计值。仿真表明,该算法能够以较低的细化倍数,获得高精度频率估计值,且具有较好的抗噪性能。使用FMCW雷达进行测距实验,验证了该算法的实际应用效果优于现有算法。In order to solve the influence of the fence effect on the frequency estimation accuracy and improve the frequency estimation accuracy and anti-noise performance,a high-precision frequency estimation algorithm based on Chrip-Z Transformation(CZT)is proposed.The process of frequency estimation is divided into two processes,coarse estimation and fine estimation.The FFT algorithm is applied to analyze the signal in the frequency domain to obtain the rough estimation value of the signal frequency.Based on the rough estimation value of the signal frequency,the frequency refinement interval is determined.The frequency spectrum in this interval is refined,the frequency estimation value is corrected by using the amplitude of the maximum spectral line of the refined spectrum and its left and right spectral lines to obtain the accurate frequency estimation value.Simulations show that the proposed algorithm can obtain high-precision frequency estimates with a lower number of refinement points,and has better anti-noise performance.The range measurement experiment using FMCW radar verifies that the practical application effect of the proposed algorithms is better than the existing algorithm.

关 键 词：频率估计 Chrip-Z变换 CRLB FMCW雷达 RMSE 

分 类 号：TN911.7[电子电信—通信与信息系统]