组合复信号的相位差法频率估计  

Frequency estimation of combined complex signals with phase difference method

作　　者：罗久飞 郑明轩 李靖 LUO Jiufei;ZHENG Mingxuan;LI Jing(School of Advanced Manufacturing Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学先进制造工程学院,重庆400065

出　　处：《振动与冲击》2022年第19期129-135,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51705059)。

摘　　要：在随机噪声的干扰下,传统的时移相位差校正算法的抗噪声性能可通过增大时移长度来提升;然而,随机噪声的影响、谱线定位错误以及过长的时移均可能引入相位绕卷问题,从而导致较大的估计误差,这大大限制了传统算法的估计精度。针对这一问题,研究了造成相位绕卷的主要因素,并分析其对时移相位差法频率估计的影响;为进一步提高频率估计的精度,提出一种组合复信号的相位差校正法。仿真结果表明,与几种传统的相位差算法相比,组合复信号的相位差法可实现长时移下的频率估计,且具有良好的抗噪声性能。Under interference of random noise,anti-noise performance of traditional time shift phase difference correction algorithm can be improved by increasing time shift length.However,effects of random noise,wrong spectral line positioning and too-long time shift may introduce a phase winding problem,and cause larger estimation error,theselargely limit estimation accuracy of traditional algorithm.Here,to solve this problem,main factors causing phase winding were studied,and their effects onfrequency estimation of the time-shift phase difference method were analyzed.In order to further improve accuracy of frequency estimation,a phase difference correction method for combined complex signals was proposed.Simulation results showedthat compared with several traditional phase difference algorithms,the phase difference method of combined complex signals can realize frequency estimation under long time shift;it has good anti-noise performance.

关 键 词：相位差法 相位绕卷 频率估计 时移系数 

分 类 号：TN911.6[电子电信—通信与信息系统]