Atmospheric propagation in the frequency range 100-1000 GHz
Atmospheric propagation in the frequency range 100-1000 GHz
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100-1000 GHz 频率范围内的大气传播
DOI：
10.1049/ree.1979.0070
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
A. Zȧvody
中科院分区：
文献类型：
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作者：
R. Emery;A. Zȧvody
大气对 100–1000 GHz 频率范围内传播的影响从分子吸收、颗粒或液滴效应以及折射效应方面进行了讨论。与较低频率的传播相比，分子吸收的效果大幅增加，这主要是由于水蒸气分子的吸收，这方面受到特别关注。分子吸收可以使用已发布的线路参数进行建模，但还必须注意由水蒸气双分子（二聚体）引起的显着吸收，目前这些吸收未包括在线路列表中。总预测吸收解释了在现场观察到的分子吸收的主要方面，但在远离强共振吸收区域的最小衰减频率下，现场测量显示出无法理解的显着差异。可以对涉及吸收和散射的折射效应和粒子影响进行建模，但预测受到对适当气象数据的需求的限制，气象数据与该频率范围内的传播具有特别相关性。对穿过大气的水平传输路径和倾斜路径进行了与预测的比较。
The influence of the atmosphere on propagation in the frequency range 100–1000 GHz is discussed in terms of molecular absorption, effects due to particles or droplets, and refractive effects. Compared with propagation at lower frequencies, molecular absorption shows a substantial increase in effect, mainly due to absorption by water vapour molecules and this aspect is given particular attention. Molecular absorption may be modelled using published line parameters, but attention must also be given to significant absorption caused by double molecules of water vapour (dimers), which at present are not included in the line tabulations. The total predicted absorption accounts for the main aspects of molecular absorption observed in the field, but at frequencies with minimum attenuation, away from the strong resonance absorption regions, field measurements have shown significant differences which are not understood. Refractive effects and the influence of particles, involving both absorption and scattering, can be modelled, but prediction is limited by the need for appropriate meteorological data which has a particular relevance to propagation in this frequency range. Comparison with prediction is made both for horizontal transmission paths and slant paths through the atmosphere.