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针对随机气流和无人机(Unmanned Aerial Vehicles, UAV)机体振动引起的抖动影响UAV安全通信性能的问题，提出一种基于有源可重构智能表面(Reconfigurable Intelligence Surface, RIS)的辅助抖动UAV空地安全通信方案。该方案采用泰勒展开的线性近似方法表征仰角和方位角变化所产生的信道误差，在用户保密速率约束下，优化UAV机载基站的预编码矩阵和有源RIS的反射系数，以最小化机载基站的发射功率。将对应的优化问题分解为发射端预编码矩阵和有源RIS反射系数优化两个子问题，并通过交替优化方法求解。仿真结果表明，所提方案可以使UAV机载基站的发射功率在UAV抖动量为0.02的情况下降低10倍，能够在UAV抖动情况下保障用户安全通信速率。
Abstract：For the problem of the impact of random airflow and unmanned aerial vehicle(UAV) body vibration on UAV safety communication performance, an auxiliary shaking UAV air-to-ground safety communication scheme based on active reconfigurable intelligence surface(RIS) is proposed. This scheme uses the Taylor expansion linear approximation method to characterize the channel errors caused by changes in elevation and azimuth angles. Under the constraint of user secrecy rate, the precoding matrix of the UAV airborne base station and the reflection coefficient of the active RIS are optimized to minimize the transmission power of the airborne base station. The corresponding optimization problem is decomposed into two sub problems: the precoding matrix at the transmitting end and the optimization of the active RIS reflection coefficient, which are solved through alternating optimization methods. Simulation results show that the proposed scheme can ensure the safe communication rate of users in UAV under 0.02 shaking conditions, and reduce the transmission power of UAV airborne base stations by 10 times under small UAV jittering.
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基本信息:
DOI：10.13682/j.issn.2095-6533.2025.04.004
中图分类号:TN918;V279;V243.1
引用信息:
[1]戈艺萌,刘浩宇,万鹏武,等.有源可重构智能表面辅助抖动无人机空地安全通信方案[J].西安邮电大学学报,2025,30(04):29-38.DOI:10.13682/j.issn.2095-6533.2025.04.004.
基金信息:
陕西省教育厅科学研究计划项目(24JK0668)