移动自由空间光通信的捕获、跟踪和瞄准装置综述

A Survey on Acquisition;Tracking and Pointing Mechanisms for Mobile Free-Space Optical Communications

文章给出了用于自由空间光学（FSO）通信系统的瞄准，跟踪和捕获（ATP）装置的综述。ATP装置是移动无线光通信中广泛使用案例的重要组成部分。为了保证FSO通信有效工作，使用ATP装置使FSO发射机和接收机对准达到视距。运动不仅与移动站点相关联，而且也与固定的FSO终端（如楼宇间FSO通信）所经历的短暂位移有关。本文ATP装置综述根据其工作原理、使用案例和实现技术进行分类，列举和讨论了三种ATP装置的优缺点，讨论了当前的挑战和未来的研究方向。

This paper presents a comprehensive survey on acquisition, tracking, and pointing （ATP） mecha- nisms used in freespace optical （FSO） communications systems. ATP mechanisms are a critical component for a wide variety of use cases of mobile FSO communications. ATP mechanisms are used to align FSO transmitter and receiver to attain line-of-sight, which is required for effective operation of FSO communications. Motion is not only associated to mobile stations but also to temporary displacements experienced by stationary FSO termi- nals, such as in building-tobuilding FSO communications. The surveyed ATP mechanisms are categorized ac- cording to their working principles, use cases, and implementation technology. The advantages and disadvanta- ges of surveyed ATP mechanisms are listed and discussed. We also discuss current challenges and future re- search directions.