Recommendation itu-r sf. 1485 (05/2000)




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Recommendation ITU-R SF.1485

(05/2000)


Determination of the coordination area
for Earth stations operating with non geostationary space stations in the fixed-satellite service in frequency bands shared with the fixed service





SF Series

Frequency sharing and coordination between

fixed-satellite and fixed service systems

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 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 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

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 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 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

Geneva, 2010


 ITU 2010

All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU.

RECOMMENDATION ITU-R SF.14851, **

DETERMINATION OF THE COORDINATION AREA FOR EARTH STATIONS OPERATING WITH NON-GEOSTATIONARY SPACE STATIONS IN THE FIXED-SATELLITE SERVICE IN
FREQUENCY BANDS SHARED WITH THE FIXED SERVICE

(2000)


Rec. ITU-R SF.1485
Scope

This Recommendation addresses the determination of coordination area for earth stations operating with non-geostationary satellites in the fixed-satellite service in frequency bands shared with the fixed service. Annex 1 describes the determination using a method sometimes called the time-varying gain (TVG) method and provides examples of its application in the Appendices to Annex 1 (See also Recommendation ITU-R SM.1448, Annex 1, § 2.2.2). Annex 2 provides a description of the determination of coordination area using a method sometimes called the composite method.

The ITU Radiocommunication Assembly,

considering

a) that WRC 95 allocated spectrum to satellite services, on a primary basis, that is used by the FS;

b) that the satellite services may operate with space stations in non-GSO orbits;

c) that emissions from earth stations operating with space stations in non-GSO orbits may produce interference to FS receivers and vice versa;

d) that Radiocommunication Study Group 1 is drawing together the results of studies from all concerned Study Groups in the development of text that may be used to revised RR Appendix S7;

e) that it is possible to define an area around a non-GSO earth station outside of which a FS station would cause or be subject to only negligible interference;

f) that the pointing of the antenna of an earth station operating with a space station in a non GSO orbit varies with time and in accordance with the orbital parameters of the operational non-GSO satellite and the location of the earth station;

g) that procedures, similar to those which currently exist, should be established for the determination of coordination area around earth stations operating with non-GSO orbits,



recommends

1 that the determination of the coordination area around a non-GSO satellite system earth station takes into account the percentage of time that the earth station is pointing in the direction of interest;

2 that, when calculating the basic transmission loss, Lb(p), the percentage of the time, p, during which the interfering power into the FS station receiver is allowed to exceed the maximum allowable level, Pr(p), is modified by the percentage of time that the non-GSO earth station antenna is pointing in the direction of interest;

3 that the determination of the coordination area should take into account the orbital parameters of the space stations operating with the non-GSO earth station;

4 that the methods in Annex 1 or Annex 2 should be considered by administrations in determining the coordination area (see Note 1).

NOTE 1 – The orbital equations in the procedure of Annex 1 are applicable to circular orbits only.

ANNEX 1

Determination of the coordination area for earth stations operating with non-GSO space stations in the FSS in frequency bands shared with the FS

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