时频分析在宽带信号检测中的应用研究

该文以时频分析中最典型的Wigner Ville分布在宽带信号检测中的应用展开讨论 ,与传统的处理方法进行比较 ,着重突出了其时频特征分离的特性。对比匹配滤波器进行了宽带确知信号的检测 ,指出基于互Wigner Ville分布的检测方法能够达到匹配滤波器的检测效果。在此基础上提出了采用时变滤波的改进方法 ,最后讨论了信号时宽、带宽对检测性能的影响。

Research of Wideband Signal Detection based on Time-frequency Analysis

In this paper,application of detection method based on Wigner Ville Distribution(WVD),a typeical Time Frequency Analysis method,to wideband signal detection is discussed and is compared to traditional treatment method with stress on its time frequency separation characteristic.The WVD based detection method has identical performance to that of the matched filter for a known signal.Furthermore,an method based on the time frequency filter is presented.It is shown that the improved method has higher gain than the traditional band pass filter for its inherent time varying filtering operation.Finally,the effects of the duration and bandwidth of a wideband signal on detection are also discussed.