摘要
针对小波脊线法在提取频率编码信号调制特征时信噪比性能较差的缺点,基于小波变换谱,将时频重排和时频脊线相结合,提出了一种新的时频联合分析方法.该方法借助于时频重排在改善谱图时频凝聚性方面的优势,使算法的信噪比性能得到有效改善.仿真表明,该方法在低信噪比条件下仍可得到准确的估计值.
Aimed at the shortcomings that the SNR of wavelet-ridge applied to extracting the modulation features of FSK signals is worse, a novel joint time-frequency analytical method was proposed combining time- frequency reassignment with time-frequency ridge based on the wavelet spectrum. By means of time-frequency reassignment in improving the time-frequency agglomeration of spectrum, the method enhances the SNR performance greatly. The simulation results show that the more accurate estimates can be obtained under the circumstance of low SNR.
出处
《空军雷达学院学报》
2007年第3期165-167,189,共4页
Journal of Air Force Radar Academy
关键词
频率编码信号
调制特征
时频重排
小波谱
脊线
FSK signal
modulation features
time-frequency reassignment
wavelet spectrum
ridge
