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In this paper, a cascade acceleration feedback control (AFC) enhanced by disturbance observation and compensation (DOC) method is proposed to improve the tracking precision of telescope systems. Telescope systems usually suffer some uncertain disturbances, such as wind load, nonlinear friction and other unknown disturbances. Then, to ensure the tracking precision, the acceleration feedback loop which can increase the stiffness of system is introduced. Besides, to make further improvement on the tracking precision, we combine the DOC method which can estimate the accurate disturbance and compensate it. Furthermore, the analysis of track accuracy of this method is proposed. Finally, a few comparative experimental results show that the proposed control method has excellent performance for reducing the tracking error of telescope system.

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