Secure State Estimation for Systems With Silent Packet Loss and Its Application to Controller Design

Area of Science:

• Control Systems Engineering
• Cybersecurity
• Estimation Theory

Background:

• Silent packet loss (SPL) and unknown packet-loss rate (PLR) challenge traditional state estimation.
• These conditions render optimal estimators (OE) infeasible and introduce security vulnerabilities.

Purpose of the Study:

• To design a secure state estimator for SPL systems with unknown PLR.
• To address the infeasibility of OE and mitigate security risks associated with silent packet loss.

Main Methods:

• Parameter estimators developed to determine packet-loss status and PLR.
• A novel state estimator designed for asymptotic convergence to OE performance.
• A security degree concept and sufficient condition for secure estimation established.

Main Results:

• The proposed state estimator asymptotically converges to optimal performance.
• A sufficient condition for secure estimation in SPL systems is derived.
• A feedback controller based on the secure estimator is designed and validated.

Conclusions:

• The developed secure state estimator effectively handles silent packet loss and unknown packet-loss rates.
• The approach ensures both estimation accuracy and enhanced system security.
• Validated through simulations and experiments, the method is suitable for practical SPL systems.