基于Sobel算子实现WVD交叉项的衰减  

Sobel Operator Based Cross-Terms Attenuation in the Wigner-Ville Distribution

作　　者：牛萌[1] 刘光斌[1] 刘冬[1] 

机构地区：[1]第二炮兵工程学院,西安710025

出　　处：《宇航计测技术》2007年第2期38-40,共3页Journal of Astronautic Metrology and Measurement

摘　　要：针对在分析多分量信号时,WVD的交叉项使得时频分布图变得难于解释,提出了一种基于Sobel算子的WVD交叉项衰减方法。该方法首先利用模糊函数将信号聚集在原点附近,再利用Sobel算子作为滤波算子,对AF进行滤波,最后通过二维傅里叶变换,得到交叉项衰减后的WVD。实验结果证明该方法可以很好的抑制WVD交叉项。As to multi-signals, the figure of time-frequency distribution becomes difficult to understand due to cross-terms in the Wigner-Ville distribution （WVD）, a method of cross-terms attenuation in the WVD based on Sobel operator is proposed. Firstly signals gather round the origin with Ambiguity Function（AF）, secondly AF is filtered with Sobel operator as filter operator. Finally the WVD with cross-term attenuation is obtained by 2-D Fourier transformation. Experiments demonstrate the efficiency of the method in cross-term suppression in the WVD.

关 键 词：WVD SOBEL算子 模糊函数 交叉项 傅里叶变换 

分 类 号：TN957.51[电子电信—信号与信息处理]