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无人机测控与通信地空视距链路一般工作在低仰角移动通信模式,信号传输受地面复杂环境影响造成多径效应、多普勒效应和阴影效应等导致接收信号的衰落,其衰落特性不能用单一的概率分布函数来描述。针对该链路的具体特性,采用状态数为3的高动态Markov信道模型描述其传播特性并进行了仿真分析,仿真结果表明,信道传输特性必须考虑多径、阴影和多普勒的综合影响,简化的信道模型可能对那些在复杂环境获得的试验数据的分析带来不利影响。
Abstract：The ground-air LOS datalink of UAV TT&C and communication system operates generally at low elevation,and the impacts of complex ground environment on signal transmission must be considered,such as multipath effects,Doppler effects,shadow effects,etc. which result in received signal fading. The fading can't always be succinctly summarized in simple analytic formulas. A statistical model with three-state Markov chain for the UAV LOS channel is presented. The simulation results show that the shadow effects must be considered together with other factors.
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基本信息:
DOI：
中图分类号:TN911.22
引用信息:
[1]陈远友.无人机测控与通信系统信道传输特性研究[J].无线电工程,2014,44(03):15-17+23.
基金信息:
国家部委基金资助项目