面向空间平台的多节点间同时激光高速信息传输系统

This project aims to study the high-speed laser transmission between multiple nodes in spatial information networks. To carry out the high-speed free space laser communication transmission experiment for air to ground and air to air link on space platform. Firstly, the main space node which has the ability to communication with two nodes at the same time is proposed to carry out space laser communication terminal, research on the design of laser communication terminal unit with light and small size and low power consumption is carried out. And the environmental adaptability design for space laser communication terminal is developed. Then the physical layer and link layer optimization technology of the laser communication in the atmospheric channel is studied. And the main and slave laser communication terminal are develop. Finally experiment of multi node simultaneous space laser communication network for space platform is carried out, and performance evaluation method is studied. It will be important to the scientific and practical development for space laser communication network and space information network construction.

本项目旨在研究空间信息网络中多节点同时激光高速信息传输技术，开展空-地、空-空链路激光通信外场演示验证试验。首先提出多节点同时激光通信的总体方案，接着开展轻小型化、低功耗激光通信光端机设计、环境适应性与补偿技术研究以及大气信道内激光通信物理层与数据链路层参数优化研究，然后研制主光端机和从光端机，并进行外场演示验证试验与性能评价。本项目的实施，将对空间激光通信组网与未来空间信息网络建设具有重要的科学意义和实用价值。

本项目旨在研究空间信息网络中多节点激光高速信息传输，开展面向空间平台的空地、空空链路激光通信外场组网传输实验。针对空中平台特性、承载能力、大气信道特性等外界约束条件，开展了轻小型化、低功耗激光通信端机设计技术研究；针对外界环境特性，开展了空间激光通信光端机环境适应性设计；针对星地链路大气扰动问题，开展了大气信道内激光通信的物理层与链路层优化技术研究；研制了一点对多点同时激光通信原理验证装置，参与了集成演示试验，在试验工程中摸索了飞艇平台姿态位置变化对激光通信链路影响的规律、攻关了大气湍流造成的接收功率闪烁主动补偿技术。项目组于2020年12月23日至2021年1月6日在西藏鲁朗完成了基于系留气球的“一对二”同时空间激光通信试验，首次实现了动平台条件下激光一对二组网外场通信试验，具体实现指标：通信终端数3个，速率2.5Gbps，误码率1E-9（条件为通信距离2km，系留气球高度离地200m，风速3.5m/s）。试验充分验证了一对多激光通信终端在极恶劣环境条件下的可靠性，为激光通信组网技术应用奠定基础。