Output feedback stabilization and approximate and restricted tracking for a class of cascaded systems

Alessandro Astolfi, Georgia Kaliora, Zhong Ping Jiang

Research output: Contribution to journalArticle


In this note, we discuss the problems of output feedback stabilization for a class of cascaded systems and of (approximate and restricted) output regulation for general nonlinear systems. It is shown that (global) output feedback stabilization for a class of systems in feedforward form can be achieved with a dynamic feedback law, yielding bounded control, and relying on the introduction of a reduced-order observer. The above result, together with standard tools borrowed from the output regulator theory, is instrumental to construct dynamic control laws achieving (approximate) disturbance rejection and output tracking in the presence of (small) disturbance/reference signals generated by a known exosystem.

Original languageEnglish (US)
Pages (from-to)1390-1396
Number of pages7
JournalIEEE Transactions on Automatic Control
Issue number9
StatePublished - Sep 1 2005



  • Cascaded systems
  • Output feedback
  • Output regulation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering

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