Minimal Sensor Activation for Detectable Networked Discrete Event Systems

This letter is concerned with the minimal sensor activation problem for a class of networked discrete event systems (DESs) with channel delays. A new concept called networked detectability is proposed to characterize the detectability of networked DESs in minimal sensor activation problem. Then, an observer-based approach is proposed to verify the networked detectability. Under verified networked detectability, the feasible sensor activation policies for networked DESs are investigated. By searching for the maximum feasible sub-policy of a given activation policy, a minimal sensor activation policy for networked DESs is designed as an algorithm. Several examples are used to illustrative the proposed methods.