摘要
构建了一种临近空间Ka频段小区制覆盖的通信信道模型。首先,讨论了临近空间信道的几何特性,将通信覆盖区域根据不同仰角分为高仰角区、中仰角区和低仰角区;其次,分析了影响信道特性的5种因素:大气吸收衰减、对流层闪烁衰减、云雾衰减、降雨衰减以及地面反射体造成的多径效应,总结出降雨衰减和多径效应对临近空间Ka频段通信信道的影响要远大于其他3种因素;最后,分析了不同仰角情况下,地面反射体、雨衰对信道的影响,并且根据Ka频段静止卫星通信信道在各种天气条件下信号的概率分布参数,对临近空间Ka频段小区制覆盖的通信信道模型进行了仿真,分别给出了不同仰角区的误码率性能仿真曲线。对于临近空间通信平台的开发与研究具有指导意义。
In this paper, a Near Space Ka frequency village system covering Channel Model is built. Firstly, Near Space Channel＇s geometry is discussed, according to different elevations, the communication coverage area is divided into high elevation area, middle elevation area and low elevation area. Secondly, the five factors those have an impact on channel characteristics, i.e. atmospheric absorption attenuation, troposphere flashing attenuation, cloud attenuation, raining attenuation and muhipath effects caused by the ground body reflection, are analyzed. The summary is given that the influence of the raining attenuation and that of the muhipath effects on Near Space Ka band communication channel are much larger than those of the other three factors. Finally, the impact of ground reflector and that of raining attenuation on the channel in different elevation cases are analyzed. And according to Ka band geostationary satellite communication channel signal＇s probability distribution of parameters in various weather conditions, Near Space Ka frequency village system covering Channel Model is simulated, and the BER performance simulation curves of different elevation areas are given. The model in this paper is of guiding significance in exploration and research of Near Space communication.
出处
《空军工程大学学报（自然科学版）》
CSCD
北大核心
2011年第5期76-80,共5页
Journal of Air Force Engineering University(Natural Science Edition)
基金
空军工程大学电讯工程学院科研创新基金资助项目(DYCX1006)
关键词
临近空间
雨衰
多径
信道建模
Near Space
rain fade
multipath
channel modeling
作者简介
苏一栋（1986-），男，山西高平人，硕士生，主要从事信号处理、信道建模研究．E-mail：sssyyd@yahoo．com．cn
