中文摘要：

宽带地空信道传输环境很复杂,多径衰落、多径时延、衰落速率、波达方向、相干时间等参数都会影响地空通信系统的设计。为了更全面、准确的描述地空信道特性,利用地空椭球信道模型的建模方法,通过实际测量和统计的实测数据获得俯仰角、直射信号的传输时延和在此仰角下的多径信号的最大时延值,计算得到它的随机波达方向和随机时延,将波达方向应用于射线跟踪,进行信道仿真。这种建模方法既减少了计算量,又提高了仿真速度。仿真结果表明,理论分析模型和仿真结果一致,此方法更加接近实际信道。

英文摘要：

Transport environment of wideband air-to-ground channel is very complex,and there are many factors to impact on designing air-to-ground communication system,such as multipath fading,multipath delay,fading rate,DOA,coherence time and so on.It used ground-to-air elliptical channel modeling,and obtain the elevation,transmission delay of LOS signal and maximum delay of multipath signal at this elevation from actual messurement and statistics of datum.By a series of calculation,its random DOA and random delay were solved.Then these datum were substituted into raytracking model,and simulated the channel.The method of modeling reduced calculation and improved the simulation speed.The simulation results prove that theoretical analysis model agree with the simulation result,which is close to the actual channel.