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.
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)
关键词
频率编码信号
脉内特征
时频重排
小波谱
脊线
FSK signal
in-pulse features
time-frequency reassignment
wavelet spectrum
ridge
