一种非均匀采样系统采样均匀性的评价新方法

A Novel Evaluation Method for Sampling Uniformity of Nonuniformly Sampling Data Acquisition Systems

提出了在多A/D合成采样系统中采样均匀性的评价方法;通过使用正弦波激励系统,将各个子A/D的数据分别抽取形成子抽样序列,使用最小二乘正弦波曲线拟合法,获得各个子抽样序列初始相位间的差异,该差异对应的时间差即为各个子A/D间的采样延迟时间,它们的一致性就是系统的采样均匀性。在一组仿真数据上验证了方法的正确性。在数字存储示波器的实测数据上进行了实验验证,获得了有效的测量结果,验证了方法的可行性。该方法可以用来评价非均匀采样系统的采样均匀性。

A method to evaluate the sampling uniformity is presented, it deals with the nonuniformly sampling data acquisition systems. By using sinusoidal stimulating and then re-sampling the data to create sub-series of each sub-A/D converter, through curve-fit results of sub-series sinusoidal waveforms, the phase difference between two sub-series can be obtained. The time difference corresponding the phase difference is the sampling time delay between two sub-A/D, their consistency is the sampling uniformity of nonuniformly sampling systems. In a set of simulation tests, the correctness of the method is validated. In practical experiment on a digital storage oscilloscope, the effective results are got, and the feasibility of the method is proved. The method can be used to evaluate the sampling uniformity of nonuuiformly sampling data acquisition systems.