摘要
将图像处理技术同Wigner-Ville分布相结合得到一种新的交叉项抑制方法。先对信号做伪Wigner-Ville变换,然后对时频图旋转一定角度,再逆方向旋转相同的角度,则此时信号的时频分布在交叉项地方存在明显的偏差;利用这种偏差检测到交叉项,最后设计二值滤波将交叉项滤去,得到没有交叉项的信号时频表示。仿真结果表明了该方法的有效性。
After combining with image processing technology and Wigner-Ville distribution, we can obtain a new method of cross-term suppression. Fist we make pseudo-Wigner transform towards signal , then rotate the time-frequency figure according to some angle and revole the same angle by adverse direction. So the time-frequency distribution of these two exist obvious mismatch, and the cross-terms can be detected using this mismatch. Finall, the cross-termswill be removed through designing a filter of 2-value, the new time-frequency distribution has no cross-terms. The simulation denotes that the method this paper proposed is effective.
出处
《电子测量技术》
2009年第7期146-148,共3页
Electronic Measurement Technology
关键词
时频分析
伪-Wigner分布
交叉项
图像处理
time-frequency analysis
pseudo-Wigner distribution
cross-terms
image processing
