高空平台站空地链路信道建模与QualNet仿真

摘要

高空平台站通信是实现中继通信的重要手段，其受大气效应及多径效应制约严重，但网络仿真器中缺少针对高空平台通信系统的准确信道模型，无法进行有效的仿真分析。为此，从分析ITU-R模型与Ricean模型出发，在此基础上改进QualNet仿真器内置的信道模型，使之基本实现对真实空地链路信道的近似模拟，将该信道模型应用于网络仿真中，并分析信道特性对空地链路性能的影响。最后，搭建了基于QualNet的半实物仿真平台，进一步增强了空地链路仿真的准确性和合理性。该信道模型及仿真平台对高空平台站通信系统的参数设计、性能分析具有重要意义。%High Altitude Platform station( HAPs) communication is an important way to realize relay com-munications. Its performance is seriously restricted by the atmospheric effect and multipath effect, howev-er, network simulators lack a realistic air-ground link channel model which would allow having accurate simulation,so it is difficult to perform effective simulation and analysis. According to the analysis of ITU-R model and Ricean model,the channel model in QualNet is improved for the purpose of realizing the ap-proximate simulation of the real air-ground link channel basically. The channel model is used in network simulation, and the influence of characteristics of channel on air-ground link performance is analyzed. Fi-nally, hardware in the loop( HITL) simulation platform is built based on QualNet to further enhance the accuracy and rationality of the air-ground link. The channel model and simulation platform are helpful for HAPs communication system parameters selection and performance evaluation.