非均匀采样的频谱研究

摘要

Non-uniform sampling has a great strength is that it has good performance of restraining frequency aliasing. Firstly frequency aliasing phenomenon by sampling discussed in uniform sampling, Through compared what some of the similarities and differences are between the frequency spectrograms of uniform sampling and Non-uniform sampling discussed frequency aliasing caused by this two sampling methods , From the contrast analysis , non-uniform sampling has a great advantage* From the most simple non-uniform sampling method gradually into the completely random non-uniform sampling method, how the change of the sampling method influence digital signal spectrum are researched. Non-uniform sampling method could reduce aliasing signal spectrum to does not affect the real signal detection.%非均匀采样的一个很大的优点就是它具有抗频率混叠的性能[],首先从均匀采样讨论由采样而引起的频谱混叠现象,在均匀采样和非均匀采样的频谱图对比中讨论两种采样方式引起的不同的频谱混叠现象,从对比中分析非均匀采样方式的优势.从最简单的非均匀采样方法逐步深入到完全随机的非均匀采样方法,研究由于采样方法的改变对数字信号频谱的影响.最后可以看到非均匀采样的方法可以将混叠信号的频谱降低到完全不影响对真实信号的检测.