激光通信系统中的捕获技术及扫描策略研究

Research on acquisition technology and scanning strategy for laser communication system

捕获过程是激光通信系统的关键技术之一,是通信链路建立基础。介绍了典型的捕获技术和扫描覆盖不确定区域的方法,经典激光通信系统通常采用信标捕获的方式,主要选择大束散角的信标光进行扫描和捕获。为了适应通信终端小型化和轻量化的发展与应用需求,出现了新型无信标捕获方法,在保证激光通信链路性能的情况下,去除了大束散角的捕获用信标光,选用小束散角的信号光来完成捕获和通信链路的建立。并给出三种较为典型的扫描策略,包括螺旋扫描、光栅扫描以及光栅螺旋扫描。

Acquisition is one of the key technologies in laser communication system,and is the foundation of com- munication link. This paper introduces the typical acquisition technology and the scanning methods for the uncertain zone. The classical laser communication system usually uses the method of beacon acquisition,which mainly selects large angle beacon light for scanning and acquisition. In order to adapt the development and application requirements of miniaturization and lighten of communication terminals,a new method of beaconless acquisition has emerged. Under the condition of ensuring the performance of laser communication link,the large angle beacon light is eliminated,and the signal light with small angle is selected to complete the acquisition and the establishment of communication link. Then,three typical scanning strategies are given,including spiral scanning,grating scanning and grating spiral scanning.