基于广义解调时频分析的多分量复杂信号分解方法  

Multi-Component and Complicated Signal Decomposition Method Based on Generalized Demodulation Time-Frequency Analysis

作　　者：张晓菲[1] 刘振兴[1] 陈栋[1] 

机构地区：[1]武汉科技大学冶金自动化与检测技术教育部工程研究中心,武汉430081

出　　处：《数据采集与处理》2012年第5期630-634,共5页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(60874109;61174107)资助项目

摘　　要：在广义解调时频分析方法的基础上,将该方法应用于多分量时频变化信号的分解,并对该方法进行了改进,给出了由改进的广义解调时频分析方法分解多分量复杂信号的具体步骤。重点分析了自动获取相位函数的方法,以及对分离出来的各单分量再次进行广义时频解调的问题,得到了比较理想的时频分布。仿真实验结果证明:此法不仅可以得到原始信号中各分量的时域波形,同时也可以得到各分量的时频分布,从而为多分量复杂时频变化信号的准确分离提供了有效途径。For the generalized demodulation time-frequency analysis method,an improvement is introduced and the method for multi-component signal decomposition is presented.Several problems are analyzed,i.e.,how to get the phase function and how to obtain the ideal time-frequency distribution by the generalized demodulation time-frequency analysis used in the single-component signals obtained from the original signal.Simulation results demonstrate that the method can obtain the time domain wave of the single-component signals in the original signal and the same time-frequency distribution.Moreover,an effective method is provided for the decomposition of multi-component signals with time-varying frequencies.

关 键 词：时频分析 广义解调 离散小波包变换 相位函数 多分量信号分解 

分 类 号：TN911[电子电信—通信与信息系统] TP274[电子电信—信息与通信工程]