Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Control system with the observer of condition coordinates and uncertain disturbance Eremenko I.F., Krivonosov V.A. The purpose of this article is assessment of the control system with regulator based on state coordinates of invariable part. Luenberger observer estimates the current values of state coordinates and uncertain external disturbance. The influence of inaccuracies in model parameters to quality of control is investigated. The results of simulation the proposed control system and alternative one based on PID regulator are demonstrated.