Observer-based output feedback H_∞ control for cyber-physical systems under randomly occurring packet dropout and...

Area of Science:

• Control Theory
• Cyber-Physical Systems
• Network Security

Background:

• Cyber-physical systems (CPS) are vulnerable to packet dropout and Denial-of-Service (DoS) attacks, compromising their stability and performance.
• Existing control strategies often struggle to account for the stochastic nature of these disturbances.

Purpose of the Study:

• To investigate observer-based output feedback control for CPS subjected to random packet dropout and periodic DoS attacks.
• To develop a control method that guarantees stochastic stability and H∞ performance under these adverse conditions.

Main Methods:

• Modeling packet dropout and DoS attacks using independent Bernoulli distributions to represent the system as a stochastic system.
• Employing stochastic analysis and novel inequalities with auxiliary matrices to relax restrictive conditions.
• Designing an observer-based output feedback controller.

Main Results:

• The closed-loop cyber-physical systems are proven to be stochastically stable.
• The systems are shown to satisfy a specified H∞ performance level.
• Analysis reveals the relationship between disturbance rejection and DoS attack success rates.

Conclusions:

• The proposed observer-based output feedback control method effectively enhances the resilience of cyber-physical systems against packet dropout and DoS attacks.
• The method offers improved disturbance rejection capabilities and relaxes traditional design constraints.
• Demonstrated applicability through three illustrative examples.