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Non-uniform sampling strategies for digital control

Author

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  • Samir Khan
  • Roger Goodall
  • Roger Dixon

Abstract

Most conventional control algorithms cause numerical problems where data is collected at sampling rates that are substantially higher than the dynamics of the equivalent continuous-time operation that is being implemented. This is of relevant interest in applications of digital control, in which high sample rates are routinely dictated by the system stability requirements rather than the signal processing needs. Digital control systems exhibit bandwidth limitations enforced by their closed-loop frequency requirements that demand very high sample rates. Considerable recent progress in reducing sample frequency requirements has been made through the use of non-uniform sampling schemes, so called alias-free signal processing. The approach prompts the simplification of complex systems and consequently enhances the numerical conditioning of the implementation algorithms that otherwise would require very high uniform sample rates. However, the control communities have not yet investigated the use of intentional non-uniform sampling. The purpose of this article is to address some algorithmic issues when using such regimes for digital control.

Suggested Citation

  • Samir Khan & Roger Goodall & Roger Dixon, 2013. "Non-uniform sampling strategies for digital control," International Journal of Systems Science, Taylor & Francis Journals, vol. 44(12), pages 2234-2254.
    • Handle: RePEc:taf:tsysxx:v:44:y:2013:i:12:p:2234-2254
    DOI: 10.1080/00207721.2012.687785
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    Cited by:

    1. H.P. Wang & Y. Tian & N. Christov, 2016. "Piecewise-continuous observers for linear systems with sampled and delayed output," International Journal of Systems Science, Taylor & Francis Journals, vol. 47(8), pages 1804-1815, June.
    2. Maoyin Chen & Guibin Xu & Rongyi Yan & Steven X. Ding & Donghua Zhou, 2015. "Detecting scalar intermittent faults in linear stochastic dynamic systems," International Journal of Systems Science, Taylor & Francis Journals, vol. 46(8), pages 1337-1348, June.

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