Secure control scheme for CPSs under DoS attacks via multiple transmission channels and unknown input observer.

Area of Science:

• Control Systems Engineering
• Cyber-Physical Systems Security
• Networked Systems

Background:

• Cyber-physical systems (CPSs) are vulnerable to Denial-of-Service (DoS) attacks targeting transmission channels.
• Ensuring secure and stable control under adversarial conditions is critical for CPS operation.

Purpose of the Study:

• To develop a robust observer-based secure control strategy for CPSs under DoS attacks.
• To investigate the use of switching observers and unknown input reconstruction (UIR) for enhanced security.

Main Methods:

• An augmented system incorporating system state and measurement noises was formulated.
• A full-order observer was designed for state estimation, followed by an algebraic UIR method.
• An observer-based secure controller was designed for a switching system architecture.

Main Results:

• The UIR method successfully decoupled the control input signal.
• The stability of the switching system under DoS attacks was rigorously analyzed.
• Simulations demonstrated the effectiveness of the proposed secure control protocols.

Conclusions:

• The proposed observer-based secure control strategy effectively mitigates DoS attacks in CPSs.
• The integration of switching observers and UIR provides a viable solution for secure CPS control.
• The method offers improved resilience and stability in compromised network environments.