ABSTRACT
The problem of controlling a dynamic plant is inextricably linked with a problem of obtaining estimations of some parts of a state vector. In most cases there is no possibility of directly measuring all components of the state vector that are needed for the control design. A possible way to solve this problem is based on obtaining estimates of unmeasured components of the state vector by constructing special dynamical systems known as observers. This method generates the need for additional analysis of the behavior of extended dynamical system. The additional dynamics can lead to the occurrence of movements in the enhanced system, which differ from those of the original system if there is accurate information on all components of the state vector.
