Output feedback sampled-data control of nonlinear systems using high-gain observers

This paper studies sampled-data control of nonlinear systems using high-gai n observers. The observer is designed in continuous time, then discretized using three different discretization methods. Closed-loop analysis shows th at the sampled-data controller recovers the performance of the continuous t ime controller as the sampling frequency and observer gain become sufficien tly large. The theory is illustrated by experimental results.