基于时频分析的工频通信信号特征提取  

FEATURES EXTRACTION OF TWACS SIGNAL BASED ON TIME-FREQUENCY ANALYSIS

作　　者：张世平[1] 周庆东[1] 张绍卿[1] 

机构地区：[1]哈尔滨工业大学电气工程学院,黑龙江哈尔滨150001

出　　处：《中国电机工程学报》2004年第7期85-89,共5页Proceedings of the CSEE

摘　　要：由于数字差分技术不能提取单个通信脉冲信号,而无法实现工频通信信号的多路传输。该文从时频两个角度分析信号特征,提出了解决方案。短时傅立叶变换方法的时间与频率分辨率矛盾突出,而多分辨分析在低频段的时间分辨率差。如果将二者结合,将在低频段同时具有时域和频域的良好局部化特性。采用多分辨短时傅立叶变换方法有效的提取了信号的时频特征,并利用特征向量的自协方差矩阵,构造了可有效识别工频通信单个信号的特征参数。The system of multi channels operating simul-taneously can not accomplished based on digital differential technique which can not recognize the single impulse signal of TWACS (Two Way Automatic Communication System). This paper aims to find out an effective method to deal with this problem based on time-frequency analysis. The contradiction stands out between the time-resolution and frequency-resolution when the STFT (Short Time Fourier Transform) is used, while the hard time-resolution is presented in low frequencies by the MRA (Multi-Resolution Analysis). If two methods is put forward, it can have good characters in both the time and frequency localization. The enough features of signal in time and frequency domains could be obtained by STFT based on MRA. The eigenvalue parameters which can recognize the single impulse of TWACS effectively are constructed by the self covariance matrix of characteristic vectors.

关 键 词：电力系统 工频通信 信号特征提取 时频分析 载波通信 

分 类 号：TM73[电气工程—电力系统及自动化] TN913.6[电子电信—通信与信息系统]