H/sub 2//H/sub /spl infin// control design: LMI techniques for space applications

For ill-conditioned systems, two LMI approaches for the H/sub 2//H/sub /spl infin// design are compared: a first with an optimisation phase, and a second by replacing the optimisation stage by a feasibility one. A lower bound for a generalised H/sub 2/-norm is proposed. These two techniques are applied to two aerospace applications using a CAD for space systems developed by MMS, called ASTROLAB.