H-Infinity-Minimax Approach to the Design of Robust Control Systems. Part 2: All Solutions, All-Pass Form Solutions and the Best Solution

摘要

All solutions to a robustness optimization problem are characterized as the solutions of a two-parameter interpolation problem. From this characterization it is shown that an all-pass form solution always exists as long as a solution exists. The possibility of using non all-pass form solutions is studied, and by introducing other optimization objectives (motivated by improvements in disturbance rejection and robust stability) the best solution is sought.