高空平台站空地链路信道建模与QualNet仿真

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。

Modeling and QualNet simulation of air-ground link channel for high altitude platform station

High Altitude Platform station(HAPs) communication is an important way to realize relay communications. Its performance is seriously restricted by the atmospheric effect and multipath effect, however, 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 approximate 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. Finally, 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.