In order to improve the low-frequency compensation performance, the fine tracking system, which is used for correcting the vibration error of the telescope and the tip-tilt error induced by atmospheric turbulence, consists of two cascade control loop. 为了提高系统的跟踪精度,倾斜跟踪控制回路由两级倾斜校正回路串联而成,用于校正望远镜的跟踪误差和大气湍流引起的倾斜跟踪误差。