一种无人机低仰角测控通信信道建模方法研究  

Research on a Modeling Method of TT&C Channel for UAV with Low Elevation

作　　者：李海鹏[1] 吕瑶[1] LI Haipeng;LU Yao(Unit 92941,PLA,Huludao 125000,China)

机构地区：[1]中国人民解放军92941部队

出　　处：《无线电工程》2019年第5期408-411,共4页Radio Engineering

摘　　要：针对无人机测控通信系统,在分析低仰角信道中直射、反射与散射径特性的基础上,提出一种无人机低仰角测控通信信道建模方法。将直射径建模为含有直射载波多普勒频偏的乘性信道,采用正弦波叠加法将散射径建模为入射角在任意范围内均匀分布的衰落信道,并分析讨论了散射径中不同入射角范围对其时变性、相关性的影响。采用此模型设计2个不同莱斯因子条件下的信道实例,验证建模方法的正确性,并讨论莱斯因子对系统BER特性的影响。仿真结果表明,莱斯因子对系统性能有较大的影响,当莱斯因子较小时,则要求无人机或测控站天线主波瓣较窄,具有较强抑制多径的能力。Aiming at the UAV TT&C system,this paper proposes a modeling method of TT&C channel for UAV with low elevation on the basis of characteristics analysis of direct,reflection and scatter paths.The direct path is modeled as a multiplicative channel with direct carrier Doppler frequency offset.The scatter path is modeled as a uniform distribution fading channel with any angle of incidence by using sine wave superposition method.The influence of different incidence angles on time variability and correlation of scatter path is analyzed and discussed.Two channel examples under different Rice factors are designed by the model,which verify the accuracy of the modeling method.The influence of Rice factor on the system BER character is discussed.The simulation results show that Rice factor has a great effect on system.When the Rice factor is small,the UAV or the TT&C station needs a narrow beam antenna,which has the capability to restrain the multi-path effect.

关 键 词：无人机 多径信道 小尺度衰落 正弦波叠加法 

分 类 号：TN911.22[电子电信—通信与信息系统]