Secure Communication in Non-Geostationary Orbit Satellite Systems: A Physical Layer Security Perspective
Secure Communication in Non-Geostationary Orbit Satellite Systems: A Physical Layer Security Perspective
复制标题
非对地静止轨道卫星系统中的安全通信：物理层安全视角
DOI：
10.1109/access.2018.2885979
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Shiratori Norio
中科院分区：
文献类型：
--
作者：
Xiao Yeqiu;Liu Jia;Shen Yulong;Jiang Xiaohong;Shiratori Norio
卫星通信系统是5G时代无线异构网络不可或缺的组成部分，可提供各种关键的民用和军用应用。然而，由于无线媒体的广播性质和完全可访问性，这些系统存在严重的安全威胁。为了解决这一问题，本文首次从物理层安全的角度研究了非静止轨道（NGSO）卫星系统中的安全通信。具体来说，我们专注于下行链路的NGSO卫星提供服务，一个固定的地球站，并窃听由一个固定的窃听。首先，我们应用三种类型的轨道模型来描述卫星的运动状态。基于轨道模型，我们对这种系统的保密通信性能进行了理论分析。两个基本的性能指标，保密容量和保密中断概率的表达式，推导出在任何系统时间的封闭形式。最后，我们进行了大量的仿真，以验证我们的理论性能分析，并说明在一个实际的NGSO卫星通信系统的安全性能。
Satellite communication systems serve as an indispensable component of wireless heterogeneous networks in 5G era for providing various critical civil and military applications. However, due to the broadcast nature and full accessibility of wireless medium, serious security threats exist from such systems. As an effort to address this issue, this paper, for the first time, investigates the secure communication in a non-geostationary orbit (NGSO) satellite system from a physical layer security perspective. Specifically, we focus on the downlink of an NGSO satellite which provides services to a fixed earth station and is wiretapped by a fixed eavesdropper. We first apply three types of orbiting models to characterize the movement state of the satellite. Based on the orbiting models, we then provide theoretical analysis for the secure communication performance of such a system. The expressions of two fundamental performance metrics, secrecy capacity and secrecy outage probability, are derived in a closed form for any system time. Finally, we conduct extensive simulations to validate our theoretical performance analysis and illustrate the security performance in a practical NGSO satellite communication system.
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