ITU-R P 839-4-2013 Rain height model for prediction methods《用于预测方法的降雨高度模型》.pdf

1、 Recommendation ITU-R P.839-4(09/2013)Rain height model for prediction methodsP SeriesRadiowave propagationii Rec. ITU-R P.839-4 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunica

2、tion 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 Radiocomm

3、unication 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 statements and licensing declara

4、tions 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:/ww

5、w.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 services P Radiowave pr

6、opagation 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 and frequency standards e

7、missions 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, 2013 ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without wri

8、tten permission of ITU. Rec. ITU-R P.839-4 1 RECOMMENDATION ITU-R P.839-4 Rain height model for prediction methods (Question ITU-R 201/3) (1992-1997-1999-2001-2013) Scope This Recommendation provides a method to predict the rain height for propagation prediction. The ITU Radiocommunication Assembly,

9、 considering that information is required regarding the rain height during periods of precipitation, recommends 1 that for areas of the world where no specific information is available, the mean annual 0C isotherm height above mean sea level, h0, is an integral part of this Recommendation and is ava

10、ilable in the form of a digital map provided in the file R-REC-P.839-4-201309-I!ZIP-E; 2 that the mean annual rain height above mean sea level, hR, may be obtained from the 0C isotherm as: hR= h0+ 0.36 km The data is provided from 0 to 360 in longitude and from +90 to 90 in latitude. For a location different from the gridpoints, the mean annual 0C isotherm height above mean sea level at the desired location can be derived by performing a bilinear interpolation on the values at the four closest gridpoints.