星间光通信扫瞄捕获过程分析

Scanning acquisition process of optical communications

分析了扫瞄-凝视模式下信标光可能漏扫不确定区域的情况;提出使用有效覆盖因子表征单个信标光投影对区域覆盖的贡献;并在振动概率分布模型的基础上,根据捕获概率的要求对扰动重叠因子大小进行了推导;结合常见的扫瞄方式,提出了能完全覆盖扫瞄不确定区域的必要条件,提出了抑制平台振动并能完全覆盖不确定区域的最少扫瞄点搜索算法.根据该算法编写程序对几种扫瞄方式进行了比较,矩形扫瞄和矩形螺旋扫瞄方式下最少点数基本相同,并大约为等弧长螺旋扫瞄方式点数的一半,为光通信扫瞄捕获过程提供了算法依据.

The circumstances of missing scanning under scanning-stare mode are analyzed in this paper. The valid coverage factor which denotes the valid projection area of the single beam beacon is proposed. According to the requirement of acquisition probability, the disturbance overlapping factor is deduced based on the vibra- tion probability model. Combining with common scanning method, the necessary condition of entire coverage for scanning uncertain area is generalized. An algorithm for searching the least scanning points, which can re- strain the vibration of platform and entirely cover the uncertain area, is presented. Simulation results show that the number of the least points for rectangle scanning and rectangle spiral scanning is nearly the same, and that for the constant arc length spiral scanning is twice of them. The study provides algorithm foundation for scan- ning acquisition process of optical communications.