On-Line Continuous-Discrete Time Observer for Three-Tank System

This paper deals with the problem of state estimation of continuous dynamical systems with discrete-time output measurements. The observability of this class of systems depends on the system inputs and on the output sampling time. While several studies have addressed this problem in the case of continuous-time output measurements, few are those who have approached the case of discrete-time. Among the estimation strategies proposed in the literature, we used the high gain technique. Having the mathematical model of a hydrographic network formed by three cascaded tanks, we are interested here, in estimating two liquid levels from the discrete measurements of the other level. Simulation and experimental results validate the observation structure adopted.