Volume 36 Issue 10
Oct.  2010
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Liang Zhiguo, Meng Xiaofeng. Novel evaluation method of time base distortion of nonuniformly sampling data acquisition systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2010, 36(10): 1203-1206. (in Chinese)
Citation: Liang Zhiguo, Meng Xiaofeng. Novel evaluation method of time base distortion of nonuniformly sampling data acquisition systems[J]. Journal of Beijing University of Aeronautics and Astronautics, 2010, 36(10): 1203-1206. (in Chinese)

Novel evaluation method of time base distortion of nonuniformly sampling data acquisition systems

  • Received Date: 14 Sep 2009
  • Publish Date: 31 Oct 2010
  • By using both the time base differential non-linearity and integral non-linearity,a novel method to evaluate the time base distortion is presented, which deal 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 was obtained. The time difference corresponding the phase difference is the sampling time delay between two sub-A/D. Their consistency is the time base distortion of nonuniformly sampling systems, which can be expressed in time base difference non-linearity and time base integral non-linearity. In simulation test, the correctness of the method was validated. In practical experiment on a digital storage oscilloscope, the feasibility of the method was proved. The method above can be use to evaluate the time base distortion of nonuniformly sampling data acquisition systems.

     

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