空天地通信网络的物理层安全系统模型与关键技术

摘要

As a typical application of wireless communications,the air-space-ground communications networks are facing serious wireless communications security issues due to its inherent broadcast nature and wide coverage.Especially in the field of military satellite communications,the requirement of secure communications security is even more crucial.How to realize the security of communications is a problem must be faced.A model for physical layer security communication in air-space-ground communication network was proposed which was a cooperative layer-direct connect mixed-to-ground physical layer secure communication model.Based on this model,the security of the system was further improved by studying the relay selection problem and the power distribution problem of satellite and relay,and an overall scheme to enhance the confidentiality of the communication network was also proposed.%空天地通信网络作为无线通信的典型应用,因其固有的广播性质和广泛的覆盖区域,面临严重的无线通信安全问题.尤其在军用卫星通信方面,安全通信保障要求更是至关重要,如何实现通信的安全是一个必须要面对的问题.提出了空天地通信网络物理层安全通信的模型——协作一直连混合星地物理层安全通信系统模型.在该模型的基础上,通过研究中继选择问题、卫星和中继的功率分配问题等进一步提升系统的安全性能,并且以此提出了一个整体的适应空天地通信网络的保密性增强方案,旨在为未来的空天地物理层安全提出一套技术理论框架.