说明：  线性调频信号的分数阶傅里叶变换，完整可用。分数阶傅里叶变换采用Pei采样算法，在傅里叶域呈现宽带特性的线性调频信号，在分数阶域呈现窄带特征。
(The fractional Fourier transform of linear frequency modulation signal, available. fractional Fourier transform using Pei s sampling algorithm, in Fourier domain present broadband characteristics of linear frequency modulation signal, the fractional domain present narrowband feature. )