Non-uniform sampling strategies for digital control

Samir Khan, R.M. Goodall, R. Dixon

    Research output: Contribution to journalArticle

    16 Citations (Scopus)
    15 Downloads (Pure)

    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.
    Original languageEnglish
    Pages (from-to)2234-2254
    JournalInternational Journal of Systems Science
    Volume44
    Issue number12
    DOIs
    Publication statusPublished - 2013

    Bibliographical note

    This is an Accepted Manuscript of an article published by Taylor & Francis in the International Journal of Systems Science on 22nd June 2012, available online: http://www.tandfonline.com/doi/abs/10.1080/00207721.2012.687785 .

    Keywords

    • digital control
    • non-uniform sampling
    • delta operator
    • Fourier analysis

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