IEEE Transactions on Automatic Control, Vol.60, No.4, 1139-1144, 2015
Using Inverse Nonlinearities in Robust Output Feedback Guaranteed Cost Control of Nonlinear Systems
This paper extends the result of an earlier paper on constructive robust nonlinear output feedback controller design, which is based on the use of IQCs and minimax LQG control. In this paper, in addition to copies of the nonlinearities, we include copies of the inverses of the nonlinearities in the controller. Consequently more IQCs are exploited in the design procedure, which gives a smaller bound on the closed-loop cost function than the earlier result.