一种改进的指数核时频表示  

Improved time-frequency representation method using exponential kernels

作　　者：宁静[1] 诸昌钤[2] 朱肇昆[1] 

机构地区：[1]西南交通大学机械工程学院,成都610031 [2]西南交通大学信息科学与技术学院,成都610031

出　　处：《计算机应用研究》2010年第6期2078-2079,2083,共3页Application Research of Computers

基　　金：国家教育部博士点基金新教师项目(200806141058)

摘　　要：针对指数分布只适用于模糊函数自分量分布沿ξ和τ轴附近的信号问题,通过将指数核函数进行坐标旋转,从而实现让自模糊函数项尽可能地全部通过指数核函数,而互模糊函数项尽可能地远离该指数核函数。解决了指数分布在分析模糊域中不沿ξ和τ轴附近分布的信号时时频分布效果差的问题,并以Chirp信号为例进行了仿真,其结果证明该方法算法简单、易于实现,为抑制指数核的交叉项问题提供了另一种思路。In traditional way, time-frequency representation method using exponential kernel was only suitable in the condition that self-variable was along the ξ and τ axis. This paper proposed an improved time-frequency representation method to solve this problem. Using coordinates rotations, self-terms in fuzzy function could as far as possible all pass the exponential kernels function, and the cross-terms in fuzzy function could far away from the exponential kernels function. Testified this approach effected through a Chirp signal. The simulation result proved that this method can repression the interference satisfactorily, and an ideal time-frequency analysis result can be acquired.

关 键 词：指数分布 坐标旋转 自项 交叉项 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]