| 摘要: |
| 针对当前无人机地空信道模型存在的局限性，根据实际测量结果，对现有模型进行改进和仿真验证，并对其时变特性和稀疏特性进行了分析。首先，分析了多径的间歇性和瞬时多普勒频移特性。其次，从微观时间尺度上，得到多径的时延和增益仿真数据。最后，对宽带通信系统下的离散信道冲激响应进行了定量分析，即在连续几个符号周期内，抽头增益近似线性变化，并且在时域上具有明显的稀疏特性。研究成果为无实测数据下的无人机地空通信系统提供了验证模型，为线性时变信道稀疏重构方法的应用提供了依据。 |
| 关键词: 无人机 地空通信系统 离散信道冲激响应 稀疏重构 |
| DOI： |
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| 基金项目:武警工程大学科研创新团队基金 |
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| Characteristic analysis and simulation of unmanned aerial vehicle ground-to-air channel model |
| HU Jiansheng,LUO Weibing,LIU Ying |
| (School of Information Engineering,Engineering University of PAP，Xi′an 710086,China) |
| Abstract: |
| For the limitations of current unmanned aerial vehicle(UAV) ground-to-air channel model,according to the actual measurement result,the existing models are improved and verified by simulation,and the time-varying and sparsity characteristics are analyzed.Firstly,the intermittent existence characteristics and the instantaneous Doppler frequency shift characteristics of multipath are considered.Secondly,from the micro-time scale,the simulation data of delay and gain of the multipath component are obtained.Finally,for the broadband communication systems,the discrete channel impulse response is quantitatively analyzed.That is,during several consecutive symbol periods,tap gain changes with time linearly,and is sparse in the time domain.The research results provide a validation model for UAV ground-to-air communication system in the absence of measured data,and provide a basis for the application of sparse reconstruction method of linear time-varying channel. |
| Key words: unmanned aerial vehicle ground-to-air communication system discrete channel impulse response sparse reconstruction |
《电讯技术》编辑部 