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Compound control with hysteresis-band switching for LOS stabilization system

The gyro stabilized platform control is required to isolate the line of sight (LOS) from the disturbance and vibration of carrier and ensure pointing and tracking for target in electro-optical tracking system. A compound adaptive fuzzy PID control with hysteresis-band switching is developed for this servo system with nonlinear property and some uncertainties. Here, in the adaptive fuzzy controller, the self-tuning factors are made to modify the parameters of fuzzy controller online, and a new learning algorithm of fuzzy rules modifier is proposed to adjust control efforts. The improved PID controller are adopted to restrain motor saturation and fulfil non-error control. The hysteresis-band switching (HBS) strategy is given to deal with jitter caused by single-point switching condition. The experimental results show that the proposed method can achieve perfect control performance and is proved to be effective in bating carrier disturbances within the scope of definite noise and sensitivity to acceleration.