Constant gain observer for continuous-discrete time uniformly observable systems

For many physical processes, and in particular, chemical engineering processes, output measurements are discrete in time. Continuous-discrete observers combine a continuous time dynamical model with discrete time output measurements to estimate the unknown state or/and parameters. In this paper, we synthesized a new high gain continuous-discrete time observer based on the observability canonical form. Contrarily to Extended Kalman techniques, the gain of this observer is a constant one and its calculation is based on a discrete stationary Lyapunov equation. Simulation results related to an academic biotechnological process are given in order to illustrate the performances of the proposed estimators