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中文摘要：
本文从分数阶Fourier变换与时频分布的关系入手，在离散分数阶Fourier变换算法基础上导出了单分量chrip信号分数阶Fourier谱强度的近似表达，并依据分数阶Fourier变换的线性性质，得到了调频率不同的两分量chirp信号间分数阶Fourier谱相互遮蔽的量化结果，给出了图例分析，并进行了仿真验证．通过本文的分析可以知道分数阶Fourier域中调频率不同的多分量chirp信号间的相互遮蔽主要取决于各自的幅度、调频率和采样时间．当多分量chirp信号幅度、调频率确定后，可以通过延长采样时间来降低各分量间的相互遮蔽．
英文摘要：
Starting with the relationship between the fractional Fourier transform and the time-frequency distribution, we derives the approximate expression of the fractional Fourier spectrum intensity of a single chirp based on the digital computation of the fractional Fourier transform. The shading between the fractional Fourier spectra of two chirps with different chirp rates is analyzed, and a formula is obtained,which is illuminated by some figures and verified by a simulation.We find that the amplitude,chirp-rate and sampling interval determine the shading between the fractional Fourier spectra of multicomponent chirp signals. Prolonging the sampling interval can reduce the shading when amplitude and chirp-rate of multicomportent chirp signals are determined.
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