Design of Quantitative Feedback Controller with PID Loop for 2-DOF Stabilized Platform

This research focuses on quantitative feedback theory (QFT) controller with uncertain mathematic model for servo control of 2-DOF stabilized platform, giving a full consideration to the uncertainty of controlled object and inevitable disturbance. Considering both the uncertainty range and the performance indexes of the system, the servo control was analyzed using QFT and a tracking controller with high robustness has been designed. Matlab simulation has shown that the QFT controller with PID loop has advantages of sensitive response, non-overshoot, anti-disturbance and minimal stable error. Its dynamic/static performance is superior to those of single controllers. Further, it has indicated that the designed control system could offset the effect from output interference, which brings about good dynamic control and easy engineering practice.