摘要
文章介绍了民航甚高频地空通信的视距传播的特点,通过数学模型阐述了多径干扰的形成条件和对通信造成的影响,分析了多径干扰导致信号衰落出现的位置与地面站天线高度和飞行高度的关系,通过确定地面主反射点,计算地面天线高度与多径干扰时延的关系,探讨了天线高度对多径干扰时延的影响,研究如何抑制多径干扰。
This paper introduced the line-of-sight propagation characteristic of civil aviation VHF（very-high-frequency） radio system and explained the forming conditions of multipath interference and its influence to the system by the mathematical model. And also the relation between signal fading point caused by multipath interference and antennas height, aircrafts altitude is analysed. After that we analysed where the main reflected points were and calculated the delay time of multipath reflections from the main reflected points to the antennas of different height. In the end we discussed about the influence of antenna height on the delay time of multipath interference and the way how to reduce the multipath interference.
出处
《大众科技》
2014年第10期43-45,共3页
Popular Science & Technology
关键词
甚高频
视距传播
反射
衰落
多径干扰
时延
VHF（very high frequency）
line-of-sight propagation
reflection
fading
multipath interference
time delay
