Jorge Cortés
Professor
Cymer Corporation Endowed Chair
Stabilization of linear cyber-physical systems against attacks via switching defense
S. Liu, S. Martínez, J. Cortés
IEEE Transactions on Automatic Control 68 (12)
(2023), 7326-7341
Abstract
This paper studies cyber-physical systems modeled with linear
dynamics subject to attacks on its parameters. The attacker knows
at all times the defense employed and injects a destabilizing
Lipschitz time-varying attack signal. The defender does not know the
specific attack and aims to preserve system stability. We propose a
partitioning strategy for the set of possible attacks that generates
a finite collection of candidate defenses such that, for each member
of the partition, there is a defense that stabilizes the system with
respect to all static attack signals belonging to it. The defender
then implements a mechanism that switches among the candidate
defenses based on the evaluation of a Lyapunov-based criterion that
determines whether the current defense is stabilizing. We
characterize the properties of the switched time-varying system with
delay, the latter arising from the interval between the
switch-triggering events and their actual implementation. Our
analysis provides a bound on the delay that guarantees that the
switched defense sequence enjoys a minimum dwell-time guarantee. In
addition, we also identify a condition on the switching frequency
that ensures global exponential stability. Simulations of the
proposed switched defense mechanism illustrate its performance and
advantages over static defenses.
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Mechanical and Aerospace Engineering,
University of California, San Diego
9500 Gilman Dr,
La Jolla, California, 92093-0411
Ph: 1-858-822-7930
Fax: 1-858-822-3107
cortes at ucsd.edu
Skype id:
jorgilliyo