Event-Triggered Observer Control for Hybrid Attack Stability
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Solution Overview
Problem
Cyberphysical systems (CPS) are vulnerable to simultaneous hybrid cyber attacks, such as distributed denial of service (DDoS) and deception attacks, which can cause instability and physical damage without immediate detection, necessitating a control scheme that stabilizes the system under these complex attack scenarios.
Innovation Solution
An observer-based controller with a detector and event-triggering mechanism is employed to identify attacks and adjust control based on attack type, using Bernoulli distributions to model DDoS and deception attacks in both forward and backward channels, reducing communication overhead through event-triggered signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous communication is used to monitor system state, then detection precision is improved, but communication overhead increases
Solution Approach 1:
The patent implements event-triggered control where communication occurs periodically only when specific triggering conditions are met, rather than continuously. The event-triggering mechanism monitors system state and initiates communication only when attack detection precision requirements are violated or system stability is threatened, thereby reducing communication overhead while maintaining adequate detection capability.
Solution Approach 2:
The system employs self-monitoring through the event-triggering mechanism that autonomously determines when communication is necessary based on predefined criteria. The controller assesses its own state and initiates communication only when needed, eliminating the need for continuous external monitoring and reducing unnecessary communication overhead.
2Reliability
If traditional control schemes are used, then device complexity is reduced, but reliability deteriorates under hybrid attacks
Solution Approach 1:
The patent introduces an observer-based controller as an intermediary component that estimates system state and detects attacks. This intermediary layer processes information between the physical system and control actuators, enabling the system to maintain stability under hybrid attacks by filtering and interpreting corrupted measurements while adding manageable complexity through the observer structure.
Solution Approach 2:
The control scheme is segmented into distinct functional components: the event-triggering mechanism for communication management, the observer for state estimation and attack detection, and the controller for stability maintenance. This segmentation allows each component to specialize in a specific function, improving overall reliability under attacks while keeping individual component complexity manageable.
3Loss of energy
If event-triggered control is implemented, then communication overhead is reduced, but manufacturing precision deteriorates due to attack vulnerability
Solution Approach 1:
The event-triggered control implements continuous feedback monitoring through the triggering condition that checks whether system state deviations exceed acceptable thresholds. When attacks degrade control precision, the feedback mechanism detects this through violated triggering conditions and initiates communication to restore precision, thereby maintaining manufacturing precision despite reduced communication frequency.
Solution Approach 2:
The system performs preliminary attack detection and state estimation through the observer before control precision is significantly degraded. By anticipating precision loss through early detection mechanisms and preparing corrective control actions in advance, the system maintains manufacturing precision even with event-triggered communication that reduces overall communication overhead.
Data Source
AI summary
A method and system to control a cyber physical system using an observer-based controller including a detector to determine an occurrence of an attack on the cyberphysical system and to inform the observer-based controller via a signal. The observer estimates a system state of the cyberphysical system based on at least partial information about the cyber physical system. The observer-based controller is configured with a predetermined observer gain and controller gain. The observer-based controller is configured to control the cyberphysical system using an estimated error determination that is altered depending on a type of cyber attack. The observer-based controller is configured to control the cyberphysical system subjected to cyber attacks in both a forward channel connecting at least one sensor with the observer and a backward channel connecting the observer-based controller with actuators.