基于平流层飞艇的星地中继通信系统设计

Design of Satellite-Ground Relay Communication System Based on Stratospheric Airship

针对高轨卫星对地激光链路受大气层影响较大,难以全天候工作的现状,设计了一种利用平流层飞艇平台对激光链路进行中继的通信系统,将激光终端升空到平流层降低大气层影响,采用高速微波实现飞艇平台到地面的信息中继,可以实现5Gbit·s-1以上的可靠信息传输。对激光载荷安装、微波链路预算以及天线对准等进行了分析,总结了随机运动特性平台高精度指向和快速捕获、大幅度低频扰动特性下高精度稳定、大容量微波高速自适应均衡等关键技术,可以满足高速中继的需求。

In view of the fact that the high-orbit satellite-to-ground laser link is greatly affected by the atmosphere and it is difficult to work in all weather conditions. In this work, a communication system that uses the stratospheric airship platform to relay the laser link is desigened. A laser communication device is lifted to the stratosphere to reduce the influence of the atmosphere and a high-speed microwave device is used to realize information relay of the airship platform to the ground, which can achieve reliable information transmission more than 5 Gbps. The laser load installation, microwave link budget and antenna alignment are analyzed. The key points of high-precision pointing,fast capture of random motion platform characteristics, high-precision stability under large low-frequency disturbance characteristics and high-speed adaptive equalization of high-capacity microwave are summarized which results in meeting the needs of high-speed relay requirement.