177 research outputs found
Necessary and sufficient conditions for analysis and synthesis of markov jump linear systems with incomplete transition descriptions
This technical note is concerned with exploring a new approach for the analysis and synthesis for Markov jump linear systems with incomplete transition descriptions. In the study, not all the elements of the transition rate matrices (TRMs) in continuous-time domain, or transition probability matrices (TPMs) in discrete-time domain are assumed to be known. By fully considering the properties of the TRMs and TPMs, and the convexity of the uncertain domains, necessary and sufficient criteria of stability and stabilization are obtained in both continuous and discrete time. Numerical examples are used to illustrate the results. © 2006 IEEE.published_or_final_versio
Detection of Sensor Attack and Resilient State Estimation for Uniformly Observable Nonlinear Systems having Redundant Sensors
This paper presents a detection algorithm for sensor attacks and a resilient
state estimation scheme for a class of uniformly observable nonlinear systems.
An adversary is supposed to corrupt a subset of sensors with the possibly
unbounded signals, while the system has sensor redundancy. We design an
individual high-gain observer for each measurement output so that only the
observable portion of the system state is obtained. Then, a nonlinear error
correcting problem is solved by collecting all the information from those
partial observers and exploiting redundancy. A computationally efficient,
on-line monitoring scheme is presented for attack detection. Based on the
attack detection scheme, an algorithm for resilient state estimation is
provided. The simulation results demonstrate the effectiveness of the proposed
algorithm
Real-time estimation of the switching signal for perturbed switched linear systems
International audienceWe extend previous works of Fliess et al. [2008] on the estimation of the switching signal and of the state for switching linear systems to the perturbed case when the perturbation is structured that is when the perturbation is unknown but known to satisfy a certain differential equation (for example if the perturbation is constant then its time-derivative is zero). We characterize also singular inputs and/or perturbations for which the switched systems become undistinguishable. Several convincing numerical experiments are illustrating our techniques which are easily implementable
State estimation for linear switched systems with unstable invariant zeros and unknown inputs
International audienceIn this paper the problem of continuous and discrete state estimation for a class of linear switched systems is studied. The class of systems under study can contain non-minimum phase zeros in some of their "operating modes". The conditions for exact reconstruction of the discrete state are given using structural properties of the switched system. The state-space is decomposed into the strongly observable part, the nonstrongly observable part and the unobservable part, to analyze the effect of the unknown inputs. A state observer based on high-order sliding-mode and Luenberger-like observers is proposed. For the case when the exact reconstruction of the state cannot be achieved, the ultimate bounds on the estimation errors are provided. The workability of the proposed method is illustrated by simulations
- …