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Observability of discrete event dynamic systems

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2 Author(s)
Ozveren, C.M. ; Lab. for Inf. & Decision Syst., MIT, Cambridge, MA, USA ; Willsky, A.S.

A finite state automaton is adopted as a model for discrete event dynamic systems (DEDS). Observations are assumed to be a subset of the event alphabet. Observability is defined as having perfect knowledge of the current state at points in time separated by bounded numbers of transitions. A polynomial test for observability is given. It is shown that an observer may be constructed and implemented in polynomial time and space. A bound on the cardinality of the observer state space is also presented. A notion of resiliency is defined for observers, and a test for resilient observability and a procedure for the construction of a resilient observer are presented

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Automatic Control, IEEE Transactions on  (Volume:35 ,  Issue: 7 )