Robust non iterative synthesis of ill-conditioned plants

A successful synthesis of a difficult control problem by using the Horowitz method is presented. No iterative steps are needed to find the controller, and a good compatibility with time-domain performance is achieved. The prefilter, on the other hand, requires two iterations because the performance in the time domain is required. The Horowitz design philosophy, which emphasizes tolerances at each frequency and design to the exact uncertain plant, i.e., no norm-bounded uncertainty, has justified itself as a design tool for ill-conditioned plants to achieve economical bandwidth solution.