ITU-R P.676-13-2022 大气气体衰减及相关效应

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Recommendation ITU-R P.676-13

(08/2022)

Attenuation by atmospheric gases and

related effects

P Series

Radiowave propagation

ii Rec. ITU-R P.676-13

Foreword

The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-

frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit

of frequency range on the basis of which Recommendations are adopted.

The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional

Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups.

Policy on Intellectual Property Right (IPR)

ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Resolution

ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are

available from http://www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent

Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found.

Series of ITU-R Recommendations

(Also available online at http://www.itu.int/publ/R-REC/en)

Series

Title

Satellite delivery

Recording for production, archival and play-out; film for television

Broadcasting service (sound)

Broadcasting service (television)

Fixed service

Mobile, radiodetermination, amateur and related satellite services

Radiowave propagation

Radio astronomy

Remote sensing systems

Fixed-satellite service

Space applications and meteorology

Frequency sharing and coordination between fixed-satellite and fixed service systems

Spectrum management

SNG

Satellite news gathering

Time signals and frequency standards emissions

Vocabulary and related subjects

Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1.

Electronic Publication

Geneva, 2022

Rec. ITU-R P.676-13 1

RECOMMENDATION ITU-R P.676-13

Attenuation by atmospheric gases and related effects

(Question ITU-R 201/3)

(1990-1992-1995-1997-1999-2001-2005-2007-2009-2012-2013-2016-2019-2022)

Scope

This Recommendation provides:

a) methods in Annex 1 to calculate the slant path gaseous attenuation, phase nonlinearity, atmospheric

bending, excess atmospheric path length and downwelling and upwelling noise temperatures due to oxygen

and water vapour for the frequency range from 1 to 1 000 GHz for arbitrary known pressure, temperature and

water vapour height profiles;

b) an approximate method in Annex 2 to estimate the instantaneous slant path gaseous attenuation due

to oxygen and water vapour for the frequency range from 1 to 350 GHz when the instantaneous surface

pressure, surface temperature and surface water vapour density or integrated water vapour content

are known

from local data, a reference profile, or referenced digital maps;

c) an approximate method in Annex 2 to estimate the statistics of slant path gaseous attenuation due to

oxygen and water vapour for the frequency range from 1 to 350 GHz when the surface pressure, surface

temperature and surface water vapour density or integrated water vapour content statistics are known either

from local data, a reference profile, or referenced digital maps;

d) a Weibull approximation to the slant path water vapour attenuation for use in

Recommendation ITU-R P.1853.

Keywords

Gaseous attenuation, specific attenuation, slant path attenuation, water vapour, oxygen, phase

dispersion, upwelling, downwelling, bending

Acronyms/Abbreviations/Glossary

Altitude Vertical distance relative to mean sea level

Dispersion Variation of time delay vs. frequency

Downwelling Downward propagation of noise through the atmosphere

Exoatmospheric Originating outside the atmosphere

Height Vertical distance relative to the surface of the Earth

Isotope Multiple species of a chemical element

Upwelling Upward propagation of noise through the atmosphere

Zeeman splitting Splitting of a spectral line into several components in the presence of a static

magnetic field

Integrated water vapour content is the total amount of water vapour in a vertical column extending from the

surface of the Earth to the top of the atmosphere. The terms integrated water vapour content, total water

vapour content, total column(ar) water vapour, integrated columnar water vapour content and total columnar

content of water vapour are synonymous.

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摘要：

ITU-R P.676-13-2022 标准规范文档详细定义了大气气体（主要为氧气和水蒸气）对无线电波传播的衰减效应及相关计算方法，适用于频率从1 GHz到1000 GHz的通信系统设计。该标准提供了基于温度、气压和水蒸气密度的斜路径及水平路径衰减预测模型，是卫星通信、地面链路易受大气环境影响时的关键参考。文档还涵盖了雨衰减以外的气体吸收、折射和闪烁效应，帮助工程师精确评估链路预算、信号质量及系统可靠性，尤其适用于高频段（如毫米波）宽带通信和遥感应用。

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