The acquisition, alignment, and tracking system is an important part of airborne laser communication and is the prerequisite and guarantee for the normal communication link. In order to solve the problem of automatic tracking of laser communication links in the airborne environment, the rapid capture, alignment, and tracking of beams between terminals are realized. This article proposes a stepping motor as a control servo system and a four-quadrant detector as an automatic tracking method for the detection unit. The pulse width modulation signal controls the rotation speed of the stepping motor and combines the position distribution of the light spot on the four-quadrant detector to achieve high-precision beam tracking. On this basis, indoor simulation experiments are carried out. After many experiments, the tracking accuracy is better than 2.5 μrad, which shows that the system can be applied to airborne laser communication, and it is verified that this method has good automatic tracking performance for airborne laser communication.

中文翻译：

---

具有自动跟踪功能的机载激光通信系统

采集，对准和跟踪系统是机载激光通信的重要组成部分，是正常通信链路的前提和保证。为了解决机载环境中激光通信链路的自动跟踪问题，实现了终端之间光束的快速捕获，对准和跟踪。本文提出了一种步进电机作为控制伺服系统，四象限检测器作为检测单元的自动跟踪方法。脉冲宽度调制信号控制步进电机的转速，并结合四象限检测器上光斑的位置分布，以实现高精度的光束跟踪。在此基础上，进行了室内模拟实验。经过多次实验，跟踪精度优于2.5 μ弧度，这表明该系统可被应用到机载激光通信，并证实了该方法具有用于机载激光通信良好的自动跟踪性能。