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.
出处
《计算机应用研究》
CSCD
北大核心
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)
关键词
指数分布
坐标旋转
自项
交叉项
exponential distribution
coordinates rotation
self-terms
cross-terms
