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


This paper 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 level, 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)
JournalIEEE Control Systems Letters
StateAccepted/In press - 2021
Externally publishedYes


  • Data models
  • Delay systems
  • Delays
  • Estimation
  • Estimation error
  • Measurement uncertainty
  • Observers
  • Observers for Linear systems.
  • System dynamics
  • Time measurement

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization

Fingerprint Dive into the research topics of 'Equalized Recovery State Estimators for Linear Systems with Delayed and Missing Observations'. Together they form a unique fingerprint.

Cite this