On Redundant Observability: From Security Index to Attack Detection and Resilient State Estimation

The security of control systems under sensor attacks is investigated. Redundant observability is introduced, explaining existing security notions including the security index, attack detectability, and observability under attacks. Equivalent conditions between redundant observability and existing no...

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Bibliographic Details
Published in:IEEE transactions on automatic control 2019-02, Vol.64 (2), p.775-782
Main Authors: Lee, Chanhwa, Shim, Hyungbo, Eun, Yongsoon
Format: Article
Language:English
Subjects:
Analytical redundancy
attack detection
attack resilience
Computer memory
Computing time
Control systems
cyber-physical systems
Indexes
Noise measurement
Observability
Observability (systems)
Observers
Redundancy
resilient state estimation
Security
security index
State estimation
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Summary:The security of control systems under sensor attacks is investigated. Redundant observability is introduced, explaining existing security notions including the security index, attack detectability, and observability under attacks. Equivalent conditions between redundant observability and existing notions are presented. Based on a bank of partial observers utilizing Kalman decomposition and a decoder exploiting redundancy, an estimator design algorithm is proposed enhancing the resilience of control systems. This scheme substantially improves computational efficiency utilizing far less memory.
ISSN:0018-9286
1558-2523
DOI:10.1109/TAC.2018.2837107