1、 Recommendation ITU-R SA.1276-5 (07/2017) Orbital locations of data relay satellites to be protected from the emissions of fixed service systems operating in the band 25.25-27.5 GHz SA Series Space applications and meteorology ii Rec. ITU-R SA.1276-5 Foreword The role of the Radiocommunication Secto
2、r 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 f
3、unctions 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 r
4、eferenced in Annex 1 of 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 t
5、he 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 BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcastin
6、g service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite 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-satelli
7、te and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and 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 Gene
8、va, 2017 ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R SA.1276-5 1 RECOMMENDATION ITU-R SA.1276-5 Orbital locations of data relay satellites to be protected from the emissions of fixed service syste
9、ms operating in the band 25.25-27.5 GHz (Question ITU-R 118/7) (1997-2003-2009-2011-2013-2017) Scope This Recommendation specifies the specific orbital locations of data relay satellites (DRS) to be protected from the emission of fixed service systems operating in the band 25.25-27.5 GHz, based on e
10、i.r.p. and e.i.r.p. spectral density limits and provisions set forth in Recommendation ITU-R F.1249. Keywords DRS, orbital location, orbital position, FS station Related ITU-R Recommendations and Reports Recommendations ITU-R SA.510, ITU-R SA.1018, ITU-R SA.1019, ITU-R SA.1155, ITU-R SA.1274, ITU-R
11、 SA.1275, ITU-R SA.1414 The ITU Radiocommunication Assembly, considering a) that the 25.25-27.5 GHz band is used, inter alia, by the inter-satellite service for transmissions from low-orbiting satellites to receivers onboard geostationary data relay satellites (DRS); b) that this frequency band is s
12、hared with the fixed service (FS) among others, on a primary basis; c) that studies have shown that FS stations that have near-boresight emissions directed towards the orbital location of a DRS may cause interference to the DRS receiver that is in excess of values set forth in Recommendation ITU-R S
13、A.1155; d) that the possibility of interference to a DRS receiver depends on the e.i.r.p. density of FS station emissions radiated towards the DRS orbital location; e) that Recommendation ITU-R F.1249 sets forth practical limits on the e.i.r.p. and e.i.r.p. spectral density radiated by FS stations i
14、n the direction of geostationary DRS; f) that a limited number of DRS networks have been either deployed or are in the implementation phase and have not been equipped with adequate interference mitigation capabilities; g) that it is desirable to specify particular geostationary orbital locations to
15、be protected in order to provide administrations with the maximum flexibility in the deployment of FS stations in these frequency bands, recommends 1 that receivers onboard DRS that operate in the 25.25-27.5 GHz band which should be protected in accordance with Recommendation ITU-R F.1249 are located at the following geostationary orbital positions (given in the East direction): 9, 10.6, 16.4, 16.8, 20.4, 21.5, 47, 2 Rec. ITU-R SA.1276-5 59, 77, 80, 85, 89, 90.75, 95, 113, 121, 133, 160, 167171, 176.8, 177.5, 186, 189, 190, 192.5, 195.8, 200, 221, 298, 311, 314, 316, 319, 328, 344, 348.
