QFT/H∞ robust mixed sensitivity control of command tracking system for space vehicle

This paper describes a QFT/H-infinity design method which combines the Quantitative Feedback Theory (QFT) design concept and robust H. optimal control technique via linear matrix inequality (LMI) convex optimization approach. The relationship between QFT and H. robust control of tracking systems will be discussed. Based on our extensive experience with both H. and QFT design approaches, it appears reasonable that by synthesizing both into a single design process and enjoying the benefits offered by each approach. The complexity of the robust control system design for space vehicle is decreased by combined QFT/H-infinity design technique. Furthermore the robust controller of command tracking system is designed by QFT/H-infinity method using the advantages of the two methods for space vehicle, and the results of design are validated through simulations.