在大口径天线伺服系统存在高频未建模动态不确定性和低频风扰动的情况下，传统的PID控制算法无法满足天线伺服系统的高指向和跟踪精度要求．针对该问题，文中设计了一种基于灵敏度函数和补灵敏度函数的、兼顾系统性能和稳定性的混合灵敏度H_infinity控制算法，并将其应用于天线伺服系统．仿真结果表明，该算法不仅能显著提高天线伺服系统的动态性能，而且具有较强的扰动抑制能力和鲁棒性．

In the presence of high-frequency unmodeled dynamic uncertainty and low-frequency wind disturbance,the conventional PID control algorithm cannot provide high pointing and tracking accuracy for large-diameter antennaservo system.In order to solve this problem,a mixed-sensitivity H_infinity control algorithm based on the sensitivityfunction and the complementary sensitivity function,which possesses high system performance and strongstability,is designed and applied to the antenna servo system.Simulated results indicate that the proposed algorithmnot only significantly improves the dynamic performance of the antenna servo system but also possesses strongdisturbance rejection ability and robustness.