深空大口径天线前向反馈型伺服系统设计

Design of Feed Forward Controller for the Servo System of Large Dish Deep Space Antennas

目前深空大口径天线伺服系统多采用传统的比例积分型控制模式,它在跟踪低速运动目标时可以满足任务要求,但在跟踪高速运动目标时会产生较大的指向误差。通过在伺服系统中引入前向反馈控制器,天线的反应速度和指向精度等多方面系统性能都得到了有效提升。仿真结果表明,加入前向反馈控制器后,伺服系统的闭环性能得到了极大优化,指令捕获时间有效缩短,高速跟踪时指向误差显著降低。

Traditional deep space large dish antennas use Proportional & Integral(PI) controller,which performs well in tracking slow spacecraft,but has poor pointing accuracy when tracking a fast-moving spacecraft.To meet required accuracy,this paper introduces Feed Forward(FF) controller to upgrade the servo system and improve antenna pointing accuracy.Simulation results show that FF controller improves the performance of closed-loop transfer function,efficiently expands servo system's bandwidth and shortens the setting time in acquisition command,and the pointing accuracy in fast tracking command is significantly improved.