基于无速率码实现全球信息分发的双层卫星网络设计

摘要

This paper proposes a double-layered satellite information distribution network consisting of the GEO satel-lites and LEO satellites, which is based on the disruption tolerant characteristics of rateless codes in information distribu-tion. In the architecture of this satellite network, GEO constellation is used as the outer backbone network to provide a wide range of coverage in low latitudes, as well as to ensure the users capacity, while LEO constellation is used as the inner en-hanced network to make up the shortage of GEO backbone network's coverage. In the design of the satellite constellation net-works, considering the coverage characteristics of GEO satellites and LEO satellites, fewer satellites are adopted to achieve a worldwide information disruption tolerant distribution capacity, combined with the disruption tolerant characteristics of rateless codes. This paper simulates and analyzes the coverage capacity and the average elevation angle of the designed net-work, and the result verifies that the network can achieve a worldwide information distribution.%文章基于无速率编码在信息分发中容中断的特性，提出一种采用GEO卫星和LEO卫星组成的双层卫星信息分发网络。在该卫星网络的体系架构中，采用GEO星座作为外层骨干网络，提供中低纬度的大范围覆盖，保证用户的容量，而采用LEO星座作为内层的增强网络，弥补GEO骨干网络的覆盖不足。在卫星网络的星座设计中，考虑GEO卫星、LEO卫星的覆盖特点，结合无速率编码的容中断特性，采用较少的卫星实现信息在全球范围内的容中断分发。文章对所设计的双层卫星网络覆盖性能和平均通信仰角进行了仿真分析，验证了该网络能够实现全球范围的信息分发。