Workshop on Control at Kyoto

Observer design is classically considered as a dual problem to state feedback. But very few results address this issue in the context of uncertain system, at least in comparison of robust state-feedback design. This fact has motivated us for studying robust design of both state-feedback gains and Luemberger-like observers and we in particular show that in case of uncertain systems these two designs are inevitably coupled. The separation principle does not hold in general. The proposed results use recent tools in robust control such as S-variable approach and descriptor modeling of uncertain systems. It also gives the opportunity to introduce a promising multi-affine descriptor modeling for systems rational in the uncertainties. go back to the program page