Space Network Lab
网络相关技术分享
Introduction
卫星网络（天地融合网络）简介
In the past several decades, the field of telecommunications has witnessed explosive growth in terms of technological advancement, which has a deep impact on many fronts of the human society. By and large, there are three major types of telecommunication infrastructures: satellite systems, the Internet, and mobile wireless systems such as cellular networks and local area networks. Since the launch of the first artificial satellite in 1957, the number of satellites orbiting the Earth has been rapidly increasing. One or several of these satellites form an autonomous system (AS) from other satellites to provide some specific services, such as telecommunications, surveillance, remote sensing, positioning, navigation, and so on. Across different satellite systems, realtime resource and information sharing is typically impossible. Moreover, many satellite systems cannot provide consistent coverage in large areas due to limited illuminating time and region.
在过去几十年里，电信领域在技术进步方面经历了爆炸性增长，这对人类社会的许多领域产生了深远影响。总体来说，电信基础设施主要分为三类：卫星系统、互联网和移动无线系统，如卫星网络、蜂窝网络和局域网。自从1957年首颗人造卫星发射以来，绕地球运行的卫星数量迅速增加。其中的一颗或多颗卫星会形成一个自主系统（AS），为其他卫星提供一些特定的服务，如电信、监视、遥感、定位、导航等。在不同的卫星系统之间，实时资源和信息共享通常是不可能的。此外，由于受限的照明时间和区域，许多卫星系统无法在大范围内提供持续的覆盖。
Image source（图片来源）: H. Yao, L. Wang, X. Wang, Z. Lu and Y. Liu, “The Space-Terrestrial Integrated Network: An Overview,” in IEEE Communications Magazine, vol. 56, no. 9, pp. 178-185, Sept. 2018.