摘要
介绍了一种利用FFT计算维格纳 威利 (WVD)的算法。针对WVD二次时频分布数值计算的复杂性和计算量大的特点 ,提出了一种抽样算法。它在不改变采样频率的情况下 ,增加了处理数据的长度。在同样数据长度下 ,大大缩短计算时间。并用该算法对时变正弦信号和处理铁窗关闭声进行了时频联合分析 ,得到了满意的效果。
An algorithm using FFT to calculate Wignev Ville Distribution (WVD) is introduced. In view of the complexity of time frequency distribution numerical calculation of Wigner Ville quadratic function, and the large amount of calculation by the algorithm, a sampling algorithm is put forward, by which the length of data that can be handled gets increased in the condition of not changing the sampling frequency. Or, when dealing with the same data length, the calculation time is shortened greatly. The algorithm is applied to analyze the time frequency distributions of a simulated time varying sinusoidal signal and of the fast changing noise signal produced by closing a steel window, and satisfactory results are obtained.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2002年第2期146-149,共4页
Journal of Southwest Jiaotong University
