一种频率编码信号瞬时频率提取新方法  

Extracting In-pulse Features from FSK Signal Based on Time-Frequency Reassignment and Time-Frequency Ridge

作　　者：舒重胜[1] 

机构地区：[1]空军雷达学院训练部,武汉430019

出　　处：《电子信息对抗技术》2007年第4期1-4,共4页Electronic Information Warfare Technology

基　　金：国防预研基金资助项目(J1442050204JB4901)

摘　　要：针对小波变换法在提取频率编码信号脉内特征中的不足,提出了将时频重排和时频脊线相结合的时频联合分析方法。首先通过Morlet小波计算信号的小波谱,再对小波谱进行时频重排,最后由重排后的时频图提取时频脊线,得到频率编码信号的脉内特征。该方法在低信噪比下,能准确提取频率编码信号脉内特征信息。最后利用计算机仿真验证了该方法的可行性。Aiming at the shortage of wavelet transform in extracting in-pulse features from FSK signal, a united time-frequency analyse method combined with time-frequency reassignment and time-frequen- cy ridge is introduced. The wavelet spectrum of FSK signal by continuum Morlet wavelet transform is gained at first, then the spectrum is reassigned, the in-pulse features by extracted the ridge of the spectrum are obtained at last. The feasibility of this method is approved by the results of simulation.

关 键 词：频率编码信号 脉内特征 时频重排 小波谱 脊线 

分 类 号：TN971.1[电子电信—信号与信息处理]