Disturbance Rejection Design for a Bank-to-Turn Missile using Decoupling Quantitative Feedback Theory

Multivariable Quantitative Feedback Theory (QFT) is applied to a bank-to-turn missile plant for disturbance rejection specifications. The plant is first partially decoupled over the plant uncertainty to reduce the interaction index to below unity for frequencies around and higher than the expected closed-loop system bandwidth. QFT methodology is then applied to design a diagonal controller to meet the disturbance rejection specifications. The resulting fully populated controller is able to meet the design specifications, which was not achievable using a diagonal controller because of the interaction and delay in the system.