Equalized Recovery State Estimators for Linear Systems with Delayed and Missing Observations

Syed M. Hassaan, Qiang Shen, Sze Zheng Yong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


This letter presents a dynamic state observer design for discrete-time linear time-varying systems that robustly achieves equalized recovery despite delayed or missing observations, where the set of all temporal patterns for the missing or delayed data is modeled by a finite-length language. By introducing a mapping of the language onto a reduced event-based language, we design a state estimator that adapts based on the history of available data at each step, and satisfies equalized recovery for all patterns in the reduced language. In contrast to existing equalized recovery estimators, the proposed design considers the equalized recovery level as a decision variable, which enables us to directly obtain the global minimum for the intermediate recovery levels, resulting in improved estimation performance. Finally, we demonstrate the effectiveness of the proposed observer when compared to existing approaches using several illustrative examples.

Original languageEnglish (US)
Article number9317754
Pages (from-to)85-90
Number of pages6
JournalIEEE Control Systems Letters
StatePublished - 2022


  • Estimation
  • delay systems
  • observers for linear systems

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization


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