Design Study of Adaptive Fuzzy PID Controller for LOS Stabilized System

The LOS stabilization control based on gyro stabilized platform is required to isolate the line of sight (LOS) from the movement and vibration of carrier and ensure pointing and tracking for target in electro-optical tracking system. A hybrid adaptive fuzzy PID control is developed for this servo system with nonlinear property and some uncertainties. The self-tuning factors are made to modify the parameters of fuzzy controller online. A new learning algorithm of rules modifier is proposed to adjust control efforts. To eliminate the static error that fuzzy controller inheres and fulfil non-error control, the hybrid control are designed to achieve requirement for real-time and high stabilization precision. The experiment results in four-axes servo turntable are presented to verify the effectiveness of the proposed method in rejecting carrier disturbances