位置回路采用光电编码器作为反馈元件，完成对目标的搜索、跟踪。
The position loop use optical encoder as the feedback element. It is used to search and track the target.
位置回路采用PD控制算法，以增加系统相位裕度，减弱系统振荡，保证控制系统具有良好的动态特性。
The position loop use the PD control algorithm, to increase the system's phase margin, reduce the system's oscillation and ensure that the control system has good dynamic characteristics.
本文对AT P系统位置回路搜索扫描的控制算法进行了比较详细的讨论，并给出了校正算法的差分方程。
The control algorithm about laser range orientation for ATP system is discussed and the difference equation is presented in this paper.
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