复合微多普勒效应中几种时频方法的比较

为了研究复合振动目标微多普勒信号中目标振动特征的提取问题,进行了激光微多普勒效应探测运动目标复合振动的实验研究,对实验结果的时频域的联合分析表明:时频分析方法能够较好地分析出运动目标复合振动的微多普勒特征。运用短时傅里叶变换(STFT)、Winger分布(WD)、Winger-Ville分布(WVD)和重排平滑伪Winger-Ville分布(RSPWVD)对微多普勒信号进行了时频分析,并对结果进行了比较。结果表明:重排平滑伪Winger-Ville分布(RSPWVD)能较好地揭示微多普勒信号的特征,是一种有效的时频分析方法。

Comparison of several time-frequency analysis methods for composite micro-Doppler effect

In order to study how to extract target's vibration features from the micro-Doppler signal of compound vibration target,the authors carried out experiments to study the detecting of compound vibration of moving target by laser micro-Doppler effect.Time-frequency joint analysis of experimental results shows that the micro-Doppler effect of compound vibration of moving target can be analyzed preferably by time-frequency analysis.Four methods of Short-Time Fourier Transformation(STFT),Wigner Distribution(WD),Wigner-Ville Distribution(WVD),and Reassigned Smoothed Pseudo Wigner-Ville Distribution (RSPWVD) are used for the time-frequency analysis of the micro-Doppler effect,and are compared with each other.The results indicate that the RSPWVD can show the feature of the micro-Doppler signal best,so it's an effective time-frequency analysis method.