数据采集与处理2024，Vol.39Issue(2)：471-480,10.DOI:10.16337/j.1004-9037.2024.02.019
用于正弦波频率估计的修正I-Rife算法
Modified I-Rife Algorithm for Frequency Estimation of Sinusoid Wave
摘要
Abstract
Frequency estimation of sine wave signals is a common problem in the radar field.When the true frequency approaches the quantization frequency points,the calculation of the frequency shift factor in the I-Rife algorithm can introduce significant errors.In order to improve the accuracy of frequency estimation,this paper analyzes the performance and error sources of the Rife and I-Rife algorithms.By utilizing a spectral refinement method,a modified I-Rife algorithm is proposed.It replaces the amplitude of the spectral peak point with the amplitudes at 0.5 points to the left and right of the peak point,and interpolates the amplitude using the second highest frequency point.This approach allows for a more accurate estimation of the frequency offset.The proposed algorithm effectively enhances the estimation accuracy of frequency while maintaining a similar computational complexity to the original I-Rife algorithm.Simulation results demonstrate that the improved I-Rife algorithm outperforms the original I-Rife algorithm in overall performance and achieves an estimated root mean square error closer to the Cramér-Rao lower bound.关键词
Rife算法/频率估计/频谱细化/快速傅里叶变换/克拉美-罗下界Key words
Rife algorithm/frequency estimation/spectrum subdivision/fast Fourier transform(FFT)/Cramér-Rao lower bound(CRLB)分类
信息技术与安全科学引用本文复制引用
王哲文,许晖,易辉跃,黄浩,杨柳,邓鹤鸣,张武雄,顾豪爽,胡永明..用于正弦波频率估计的修正I-Rife算法[J].数据采集与处理,2024,39(2):471-480,10.基金项目
国家自然科学基金(U21A20500). （U21A20500）
