Downlink synchronization for the lunar laser communications demonstration

2011 International Conference on Space Optical Systems and Applications (ICSOS) Pub Date : 2011-05-11 DOI:10.1109/ICSOS.2011.5783716

M. M. Willis, B. Robinson, M. Stevens, B. Romkey, J. A. Matthews, J. Greco, M. Grein, E. Dauler, A. Kerman, D. Rosenberg, D. V. Murphy, D. Boroson

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引用次数: 13

Abstract

The Lunar Laser Communications Demonstration (LLCD) is an ongoing project to demonstrate a high-rate, bidirectional optical communications link between a lunar satellite and an Earth-based ground terminal. The optical downlink operates at data rates up to 622 Mbps and employs photon counting array receiver technology. While the use of a 16-PPM modulation format with narrow (200 ps) slots gives rise to challenging time-alignment requirements between the transmit and receive oscillators that are in constant orbital motion with respect to one another, the additional signaling bandwidth also offers the unique opportunity to provide high-resolution, centimeter-class ranging data between the satellite and the ground terminal. We discuss some of the link challenges that necessitated the creation of novel clock recovery techniques, outline the design and analysis of the header detection algorithms used to perform synchronization on the LLCD high-speed optical downlink, and present the hardware implementation and photon-counting communication testbed used to validate the design.

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月球激光通信演示下行同步

月球激光通信演示(LLCD)是一个正在进行的项目，用于演示月球卫星和地球地面终端之间的高速、双向光通信链路。光下行链路的数据速率高达622 Mbps，并采用光子计数阵列接收器技术。虽然使用窄(200 ps)槽的16 ppm调制格式会在相对于彼此处于恒定轨道运动的发射和接收振荡器之间产生具有挑战性的时间校准要求，但额外的信号带宽也提供了在卫星和地面终端之间提供高分辨率，厘米级测距数据的独特机会。我们讨论了一些需要创建新颖时钟恢复技术的链路挑战，概述了用于在LLCD高速光下行链路上执行同步的报头检测算法的设计和分析，并介绍了用于验证设计的硬件实现和光子计数通信测试平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 International Conference on Space Optical Systems and Applications (ICSOS)

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