Robust synthesis of dynamic refilters

The design of a dynamic prefilter from the point of view of robust performance under structured uncertainty is considered. Synthesis methods are presented for the cases of Xm or #8216,U2 performance, and Linear Time-Invariant (LTI) or Linear Time Varying (LTV) uncertainty, all of which result in convex optimization problems across frequency. Methods to obtain finitedimensional approximations are discussed. In the case of Uw performance and LTV uncertainty, the synthesis problem is reduced exactly to a finite dimensional Linear Matrix Inequality (LMI) in state space. nbsp