ITU-R P 837-7-2017 Characteristics of precipitation for propagation modelling.pdf
《ITU-R P 837-7-2017 Characteristics of precipitation for propagation modelling.pdf》由会员分享,可在线阅读,更多相关《ITU-R P 837-7-2017 Characteristics of precipitation for propagation modelling.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、 Recommendation ITU-R P.837-7 (06/2017) Characteristics of precipitation for propagation modelling P Series Radiowave propagation ii Rec. ITU-R P.837-7 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectru
2、m 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 Co
3、nferences 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 Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statement
4、s 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 avail
5、able online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite
6、services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals an
7、d frequency standards emissions V 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, 2017 ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means
8、whatsoever, without written permission of ITU. Rec. ITU-R P.837-7 1 RECOMMENDATION ITU-R P.837-7 Characteristics of precipitation for propagation modelling (Question ITU-R 201/3) (1992-1994-1999-2001-2003-2007-2012-2017) Scope Rainfall rate statistics with a 1-min integration time are required for t
9、he prediction of rain attenuation in terrestrial links (e.g. Recommendation ITU-R P.530) and Earth-space links (e.g. Recommendation ITU-R P.618). When reliable long-term local rainfall rate data is not available, Annex 1 of this Recommendation provides a rainfall rate prediction method for the predi
10、ction of rainfall rate statistics with a 1-min integration time. This prediction method is based on: a) total monthly rainfall data generated from the GPCC Climatology (V 2015) database over land and from the European Centre for Medium-Range Weather Forecast (ECMWF) ERA Interim re-analysis database
11、over water, and b) monthly mean surface temperature data in Recommendation ITU-R P.1510. When reliable long-term local rainfall rate data is available with integration times greater than 1-min, Annex 2 of this Recommendation provides a method for converting rainfall rate statistics with integration
12、times that exceed 1-min to rainfall rate statistics with a 1-min integration time. Keywords Rainfall rate, annual statistics, conversion method, GPCC, ERA Interim The ITU Radiocommunication Assembly, considering a) that information on the yearly statistics of precipitation parameters are needed for
13、the prediction of attenuation and scattering caused by precipitation; b) that the information is needed for all locations on the surface of the Earth and a wide range of probabilities; c) that rainfall rate statistics with a 1-min integration time are required for the prediction of rain attenuation
14、and scattering in terrestrial and satellite links; d) that long-term measurements of rainfall rate may be available from local sources with a 1-min integration time and, also, with integration times that exceed 1-minute; e) that using a model to convert local rainfall rate measurements with integrat
15、ion times up to 1 hour into an integration time of 1-minute may provide higher accuracy than Annex 1 of this Recommendation, recommends 1 that local long-term measurements of annual rainfall rate with a 1-minute integration time should be used if available; 2 that local measurements, if used, are co
16、llected over a sufficiently long period of time (typically longer than 10 years), to ensure statistical stability; 2 Rec. ITU-R P.837-7 3 that long-term measurements of annual rainfall rate with integration times that exceed 1 minute should be used if available, and the conversion method in Annex 2
17、should be used to convert these measurements to annual rainfall rate with a 1-minute integration time; 4 that, in the absence of reliable local rainfall rate data, the step-by-step prediction method in Annex 1 should be used to obtain the rainfall rate, Rp, exceeded for the desired annual probabilit
18、y of exceedance, p, for any location on the surface of the Earth, and for an integration time of 1 minute. Annex 1 Prediction method to derive the rainfall rate exceeded for a given average annual probability of exceedance and given location This prediction method calculates the rainfall rate exceed
19、ed for a desired average annual probability of exceedance and a given location on the surface of the Earth using digital maps of monthly total rainfall and monthly mean surface temperature. The monthly mean total rainfall maps were derived from 50 years (1951-2000) of data from the GPCC Climatology
20、(V 2015) database over land and from 36 years (1979-2014) of the European Centre of Medium-range Weather Forecast (ECMWF) ERA Interim data over water. The monthly mean total rainfall data, MTii (mm), where ii = 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11 and 12, are an integral part of this Recommend
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITURP83772017CHARACTERISTICSOFPRECIPITATIONFORPROPAGATIONMODELLINGPDF

链接地址:http://www.mydoc123.com/p-792288.html