摘要
针对Quinn算法估计CW脉冲信号中心频率存在误差较大的问题,在I-Quinn算法的基础上,通过比较频率偏差来代替中心区域的选取,提出了一种修正I-Quinn插值算法。修正算法先对CW信号进行Quinn插值,得到频率偏差值,然后将CW信号利用频率偏差值进行频移后,再进行Quinn插值,得到另一个频率偏差,采用较小的频偏值进行频率修正,作为最终中心频率估计值。相较于I-Quinn算法,修正算法不存在中心区域选取不当的问题,估计精度更高。仿真结果也表明,修正算法相较于各类插值算法,在整个频段的频率均方根误差更接近克拉美-罗下限。
Because the frequency estimation precision of Quinn algorithm has a great deviation,based on the improved Quinn algorithm,a modified I-Quinn algorithm is presented,which replaces the selection of the central area by comparing the frequency deviation to reduce estimation errors.Modified algorithm performs Quinn interpolation on CW signal to obtain the frequency devia⁃tion value.Then the new CW signal which is frequency-shifted by using the frequency deviation value uses Quinn interpolation again to obtain another frequency deviation.The smaller frequency deviation value perform frequency correction is used as the final center frequency estimate.Compared with the I-Quinn algorithm,the modified algorithm need not selecte central region,and has higher estimation accuracy.Simulation results show that comparing with various interpolation algorithms,the the root mean square error of the frequency of the modified algorithms is closer to the Cramer-Rao lower bound in the whole frequency band.
作者
夏文杰
陆代强
郭晓明
黄路
XIA Wenjie;LU Daiqiang;GUO Xiaoming;HUANG Lu(National Ocean Technology Center Zhangzhou Base Preparation Office,Xiamen 361001;College of Electronics Engineering,Naval University of Engineering,Wuhan 430000)
出处
《舰船电子工程》
2021年第3期153-156,共4页
Ship Electronic Engineering
基金
国家自然科学基金项目(编号:51679247)资助。
