An-ing

We must constantly look at things in a different way.
Just when you think you know something,
you must look at it in a different way.

我国的频率划分方法:

名称                 符号   频率                 波段                 波长                               传播特性        主要用途 

甚低频             VLF   3-30KHz         超长波             1KKm-100Km            空间波为主    海岸潜艇通信;远距离通信;超远距离导航 

低频                 LF       30-300KHz    长波                 10Km-1Km                  地波为主        越洋通信;中距离通信;地下岩层通信;远距离导航

射频:RFRadio frequency)频段

中频                 MF      0.3-3MHz        中波                 1Km-100m                   地波与天波    船用通信;业余无线电通信;移动通信;中距离导航 

高频                 HF      3-30MHz         短波                 100m-10m                    天波与地波      远距离短波通信;国际定点通信 

甚高频             VHF   30-300MHz    米波                 10m-1m                         空间波             电离层散射(30-60MHz);人造电离层通信(30-144MHz);对空间飞行体通信;移动通信

微波:300MHz~300GHz的电磁波

超高频             UHF   0.3-3GHz        分米波             1m-0.1m                        空间波             小容量微波中继通信;(352-420MHz);对流层散射通信(700-10000MHz);中容量微波通信(1700-2400MHz) 

特高频             SHF    3-30GHz         厘米波             10cm-1cm                     空间波             大容量微波中继通信(3600-4200MHz,5850-8500MHz);数字通信;卫星通信;海事卫星通信(1500-1600MHz) 

极高频             EHF   30-300GHz    毫米波             10mm-1mm                  空间波             在入大气层时的通信;波导通信 


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