Minimax estimation with intermittent observations

Jun Moon, Tamer Başar

Research output: Contribution to journalArticlepeer-review

Abstract

This paper considers a problem of minimax (or H∞) state estimation with intermittent observations. In this setting, the disturbance in the dynamical system and the sensor noise are controlled by adversaries, and the estimator receives the sensor measurements only sporadically, with the availability governed by an independent and identically distributed Bernoulli process. We cast this problem within the framework of stochastic zero-sum dynamic games. We first obtain a corresponding stochastic minimax state estimator (SMSE) and an associated generalized stochastic Riccati equation (GSRE) whose evolutions depend on two parameters: one that governs the random measurement arrivals and another one that quantifies the level of H∞ disturbance attenuation. We then analyze the asymptotic behavior of the sequence generated by the GSRE in the expectation sense, and its weak convergence. Specifically, we obtain threshold-type conditions above which the sequence generated by the GSRE can be bounded both below and above in the expectation sense. Moreover, we show that under some conditions, the norm of the sequence generated by the GSRE converges weakly to a unique stationary distribution. Finally, we prove that when the disturbance attenuation parameter goes to infinity, our asymptotic results are equivalent to the corresponding results from the literature on Kalman filtering with intermittent observations. We provide simulations to illustrate the results.

Original languageEnglish (US)
Pages (from-to)122-133
Number of pages12
JournalAutomatica
Volume62
DOIs
StatePublished - Dec 2015

Keywords

  • Intermittent observations
  • Kalman filtering
  • Minimax estimation ( estimation)
  • Networked control systems
  • Zero-sum dynamic games

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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