Control of systems in Lure form over erasure channel

TL;DR

This paper addresses the stabilization of discrete-time nonlinear Lure systems over unreliable erasure channels, providing stability conditions, a robust observer-based controller synthesis method, and extending classical lemmas to stochastic nonlinear systems.

Contribution

It introduces a stochastic Positive Real Lemma and separation principle, offering new tools for control design over uncertain communication channels.

Findings

Provided sufficient conditions for mean square exponential stability.

Developed a robust observer-based controller synthesis method.

Extended classical control lemmas to stochastic nonlinear systems.

Abstract

In this paper, we study the problem of control of discrete-time nonlinear systems in Lure form over erasure channels at the input and output. The input and output channel uncertainties are modeled as Bernoulli random variables. The main results of this paper provide sufficient condition for the mean square exponential stability of the closed loop system expressed in terms of statistics of channel uncertainty and plant characteristics. We also provide synthesis method for the design of observer-based controller that is robust to channel uncertainty. To prove the main results of this paper, we discover a stochastic variant of the well known Positive Real Lemma and principle of separation for stochastic nonlinear system. Application of the results for the stabilization of system in Lure form over packet-drop network is discussed. Finally a result for state feedback control of a Lure system with a general multiplicative uncertainty at actuation is discussed.