针对卫星平台振动严重影响空间光通信跟瞄精度的问题,提出了基于压电偏转控制系统的扰动补偿方案.建立了压电偏转系统的数学模型,设计了基于改进型最小均方根(LMS)滤波算法的自适应控制器,分析了最优步长选择的影响因素.针对输入信号的相位延迟问题,设计了自适应延迟滤波器,不仅有效地补偿了相位延迟,还可通过自适应调节输入信号相位,在不增加步长的前提下提高收敛速率.最后进行了实验验证,结果表明补偿后的残余误差仅为μrad量级,补偿因子达85％以上,验证了补偿算法的有效性和可行性.%A disturbance compensation scheme based on a piezo-electric steering control system was presented, for the vibration of a satellite platform seriously impacted the tracking and pointing accuracy in space optical communication. A mathematical model for the piezo-electric steering system was built. Then, an adaptive controller based on an improved Least Mean Square(LMS) filter was designed, and effect factors on optimal step length choices were analyzed. For the problem of signal phase delay, an adaptive delay filter was designed not only to compensate the phase delay, but also a-daptively to adjust the input signal phase to increase its convergence rate without adding the step length. Finally, a verifying experiment was performed. The results show that the remained errors after compensation are μrad magnitude and the compensation factor is over 85 %. These results prove that this control scheme is valid and feasible.
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