Unknown input interval observers for discrete-time linear switched systems. (May 2021)

• Record Type: Journal Article
• Authors: Marouani, Ghassen; Dinh, Thach Ngoc; Raïssi, Tarek; Wang, Xin; Messaoud, Hassani
• Is Part Of: European journal of control. Volume 59(2021)
• Page Start: 165
• Page End: 174
• Publication Date: 2021-05
• Subjects: Interval Observer -- Switched Systems -- Average Dwell Time -- Input-to-State Stability -- Multiple Quadratic Lyapunov Functions; Control theory -- Periodicals; Automatic control -- Periodicals; Automatic control -- Mathematics -- Periodicals; Electronic journals; 629.805
• DOI: 10.1016/j.ejcon.2020.09.004
• Languages: English
• ISSNs: 0947-3580

Abstract

Abstract: This paper deals with unknown input interval observer synthesis for discrete-time switched systems. First, a decomposition leading to obtain a subsystem not affected by the unknown input is presented. Second, an interval observer is designed based on the Input-to-State Stability (ISS). The gains are computed by solving Linear Matrix Inequalities (LMI) formulated based on multiple quadratic Lyapunov functions under average dwell time switching signals. In addition, a change of coordinates can be taken in order to ensure the positivity of the estimation errors. Finally, an explicit expression for the unknown input bounds is derived. Note that while the additive disturbances and the measurement noises are unknown but assumed to be bounded with known bounds, the unknown input signals are neither bounded nor stochastic .