2024年 02期

摘要(Abstract)：

为了在城市、山体、森林等高空存在散射体的地区实现无线通信覆盖，帮助实现救援以及灾后公共基础设施的抢救与恢复，针对无人机空间域和时间域非平稳特性，提出一种无人机多输入多输出三维几何双圆柱随机模型；考虑到地面站的复杂情况，利用同心圆柱模拟散射体的分布，将接收到的信号进一步分为视线分量、无人机端的单反弹分量，以及地面站的单反弹射线与双反弹分量之和；引入时变的角度和时变的速度，模拟无人机对地信道的非平稳性，从而使所提出模型适用于各种无人机通信场景；利用所提出模型对比无人机的飞行方向和天线阵列方向等相关参数对信道统计特性的影响，推导并仿真所提出模型的空间互相关函数、时间自相关函数等重要的统计特性。结果表明：无人机的天线方向、飞行方向等参数对信道统计特性和非平稳性有重要影响，所提出模型可用于无人机多输入多输出通信系统的设计；与现有其他模型对比，时间自相关函数仿真值与实际测量值的拟合程度验证了所提出模型的实用性。

关键词(KeyWords)： 移动通信;无人机通信;双圆柱随机模型;信道统计特性

基金项目(Foundation): 国家自然科学基金项目(61971167)

作者(Author): 赵满艳,周杰,刘瑞,邵根富

DOI: 10.13349/j.cnki.jdxbn.20230919.001

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