瞬时频率的Prony方法提取及MATLAB实现  

Prony Method for Instantaneous Frequency Detection and Its Implementation Based on Matlab

作　　者：王磊[1] 郝士琦[1] 戎雁[1] 

机构地区：[1]解放军电子工程学院506室

出　　处：《计算机仿真》2008年第2期303-305,309,共4页Computer Simulation

摘　　要：瞬时频率是信号重要的瞬时特征参数,由于其在通信中的信号调制样式识别、电台"指纹"识别等诸多方面有着广泛的应用,故成为信号处理领域的一个研究热点。旨在有效的提取信号的瞬时频率,介绍了瞬时频率的定义、常用的瞬时频率提取方法及扩展的Prony方法的基本原理与步骤,采用Prony方法提取信号的瞬时频率,给出了算法流程和MATLAB实现的核心程序代码,对线性扫频信号和4FSK信号进行了仿真试验,与相位建模法、WVD法相比,估计的瞬时频率在低信噪比时的均方差较小,结果表明该方法可行,在低信噪比条件下有一定的优势。Instantaneous frequency is an important instantaneous characteristic parameter of signal. It is used widely in modulation recognition for communication signal, “fingerprint”recognition for radio station and so on. So it becomes a focus in signal processing, The purpose of this paper is to detect instantaneous frequency, The definition and application range of instant frequency and the basic principle and process of extending Prony method are intro-duced. The Prony method is used to detect instant frequency, The arithmetic flow chart and the main program based on matlab are brought forth, The performance of linear swept signal and 4FSK signal is simulated. And the mean square error of result of Prony method is smaller in low SNR compared with phase modeling and WVD. The results show that the method is doable and especially has advantage in low SNR.

关 键 词：瞬时频率 瞬时特征 提取 算法流程 

分 类 号：TN911[电子电信—通信与信息系统]