大众科技
大衆科技
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DAZHONG KEJI
2014年
10期
43-45
,共3页
甚高频%视距传播%反射%衰落%多径干扰%时延
甚高頻%視距傳播%反射%衰落%多徑榦擾%時延
심고빈%시거전파%반사%쇠락%다경간우%시연
VHF(very high frequency)%line-of-sight propagation%reflection%fading%multipath interference%time delay
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。
文章介紹瞭民航甚高頻地空通信的視距傳播的特點，通過數學模型闡述瞭多徑榦擾的形成條件和對通信造成的影響，分析瞭多徑榦擾導緻信號衰落齣現的位置與地麵站天線高度和飛行高度的關繫，通過確定地麵主反射點，計算地麵天線高度與多徑榦擾時延的關繫，探討瞭天線高度對多徑榦擾時延的影響，研究如何抑製多徑榦擾。
문장개소료민항심고빈지공통신적시거전파적특점，통과수학모형천술료다경간우적형성조건화대통신조성적영향，분석료다경간우도치신호쇠락출현적위치여지면참천선고도화비행고도적관계，통과학정지면주반사점，계산지면천선고도여다경간우시연적관계，탐토료천선고도대다경간우시연적영향，연구여하억제다경간우。
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.
