WIGNER-VILLE分布及其在FMCW信号识别中的应用  

Wigner-Ville Distribution and Its Application in Identification of FMCW

作　　者：韩吉衢[1] 陈乐平[1] 

机构地区：[1]烟台大学光电信息科学技术学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2009年第3期185-188,共4页Journal of Yantai University(Natural Science and Engineering Edition)

摘　　要：介绍了FMCW信号以及Wigner-Ville分布,对利用Wigner-Ville分布识别FMCW信号进行了研究.分别对信噪比为∞,6dB,3dB,0dB,-3dB,-6dB的FMCW信号作了WVD,PWVD,SPWVD,RSPWVD的MATLAB仿真,并做了比较研究,结果表明WVD抗噪性较差,且交叉项影响较大,当信噪比较小时,基本不能识别信号;PWVD,SPWVD交叉项有所减小,但时频聚集性变差,抗噪性提高不大;RSPWVD各方面性能均有较大提高.The FMCW signal and Wigner-Ville distribution （WVD） are introduced and the recognition of FMCW signal with WVD method is studied. Based on WVD, PWVD, SPWVD and RSPWVD respectively, the FMCW signals with ∞ , 6dB, 3dB, 0dB, -3dB and -6dB SNR are simulated by MATLAB. The compared results indicate that WVD has poor noise immunity and larger cross-term. When the SNR is small, the FMCW signal can hardly be recognized. For the PWVD and SPWVD, there are smaller cross terms but worse time-frequency assembling character, which limits the improvement of noise immunity. Compared to the other methods, the RSPWVD can obtain better performance in all respects.

关 键 词：线性调频 时频分析 调频连续波信号 

分 类 号：TN911[电子电信—通信与信息系统]