【摘要】 由于智能反射面具有无源、低功耗、智能可控的特点，其发展为无人机系统物理层安全问题带来了新的思路。由于智能反射面可改变入射信号的相位，因此能够实现细粒度的波束赋形；又由于智能反射面作为一种硬件，相位调整不具有连续性，因此文中研究了存在窃听节点的无人机通信系统联合优化波束赋形和相位调整方案。通过部署在中继无人机上的智能反射面，将信号尽可能多地反射给合法无人机，同时降低非法无人机接收信号的概率，提高系统的安全速率。文中对比了采用不同的中继方式系统得到的安全速率，及在达到相同安全速率的条件下所消耗的系统功率，仿真结果表明，采用智能反射面作为中继节点的系统能够有效提高系统安全速率并能降低系统功耗。更多还原

【Abstract】 Because the intelligent reflecting surface(IRS) has the characteristics of passivity property, low power consumption and intelligent control, its development has brought new ideas to the physical layer security of UAS(unmanned aircraft system). Because the IRS can change the phase of the incident signals, fine-grained beamforming can be realized. As the IRS is a kind of hardware, its phase adjustment is uncontinuous. In view of the above, a joint optimization beamforming and phase adjustment scheme of UAV communication system with eavesdropping node is studied. By the IRS deployed on the relay UAV(unmanned aerial vehicle), the signals are reflected to the legal UAV as much as possible, while the illegal UAV receives less signals, so as to improve the security rate of the system. In this paper, the security rate obtained by different relay systems and the consumed system power under the condition of the same security rate are contrasted. The simulation results show that the system with IRS as relay node can improve the system security rate effectively and reduce the system power consumption.更多还原