Consistency and control over spectrum in linear systems with an observer

The property of consistency of a linear control system with the observer is investigated. New necessary conditions and sufficient conditions for consistency have been obtained. The problem of control over spectrum in the system with a linear incomplete feedback is investigated; necessary and sufficient conditions for the global controllability over the spectrum have been obtained in the case where the system coefficients have a special form. Connection is established between the property of consistency of a stationary system with the observer and the global controllability over the spectrum of the closed-loop system.