An improved composite control algorithm to improve the pointing accuracy of a Acquiring, Tracking and Pointing(ATP) system in a satellite platform was presented for controlling a fast-steering-mirror to reduce the beam jitter. The advantages of the composite control combined an adaptive feedforward algorithm and a PID feedback algorithm were analyzed according to the two algorithms' characteristics. Then,the convergence problem of direct composite control of two algorithms was analyzed and solved by introducing a new algorithm, decoupling composite control using decoupling theory. Finally, the algorithms referred above were experimented and compared. Experimental results indicate that, in the experiment conditions, the control accuracy of the decoupling composite control algorithm is nearly 10 times better than that of the classic PID control algorithm and 3 times better than that of the adaptive feedforward algorithm, respectively. It concludes that the decoupling composite control algorithm combines the merits of two algorithms and can reduce the beam jitter better.%提出了改进的抑制光束抖动的快速反射镜控制算法,用于提高卫星平台捕获跟瞄(ATP)系统的瞄准精度.根据自适应前馈控制和经典PID控制算法的特点,分析了两种算法复合控制的优势.探讨了现有直接复合控制算法中自适应算法不收敛的原因,并依据解耦理论引入了解耦的复合控制算法,解决了现有直接复合算法不收敛的问题.最后,对经典PID控制,自适应前馈控制和解耦复合控制算法进行了实验比较.实验结果表明,在给定实验条件下,解耦复合控制算法的控制精度相对于经典PID反馈算法提高了近10倍；相对于自适应前馈算法提高了约3倍.结果显示,提出的解耦复合控制的算法结合了两种算法的优点,对抑制光束抖动更有效.
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