ITU-R REPORT SA 2164-2009 Compatibility between the meteorological satellite and the fixed services in the band 7 850-7 900 MHz《频段在7 850-7 900 MHz固定业务和气象卫星之间的兼容性》.pdf
《ITU-R REPORT SA 2164-2009 Compatibility between the meteorological satellite and the fixed services in the band 7 850-7 900 MHz《频段在7 850-7 900 MHz固定业务和气象卫星之间的兼容性》.pdf》由会员分享,可在线阅读,更多相关《ITU-R REPORT SA 2164-2009 Compatibility between the meteorological satellite and the fixed services in the band 7 850-7 900 MHz《频段在7 850-7 900 MHz固定业务和气象卫星之间的兼容性》.pdf(23页珍藏版)》请在麦多课文档分享上搜索。
1、 Report ITU-R SA.2164(09/2009)Compatibility between the meteorological satellite and the fixed services in the band 7 850-7 900 MHzSA SeriesSpace applications and meteorologyii Rep. ITU-R SA.2164 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and e
2、conomical 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
3、 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
4、 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.
5、 Series of ITU-R Reports (Also available online at http:/www.itu.int/publ/R-REP/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, radiodetermina
6、tion, 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 Note: This
7、ITU-R Report was approved in English by the Study Group 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. Rep. ITU-R SA.2164
8、1 REPORT ITU-R SA.2164 Compatibility between the meteorological satellite and the fixed services in the band 7 850-7 900 MHz (2009) TABLE OF CONTENTS Page 1 Introduction 2 2 Background . 2 3 Meteorological satellite system description . 3 4 Fixed service system assumptions 5 5 Interference assessmen
9、t to fixed service receivers . 6 6 Interference assessment to meteorological earth station receivers . 14 7 Technical summary and discussion 20 7.1 Potential of interference into fixed service receivers . 20 7.2 Potential of interference into meteorological earth station receivers . 20 8 Conclusions
10、 21 2 Rep. ITU-R SA.2164 1 Introduction World Radiocommunication Conference 2012 (WRC-12) Agenda item 1.24 considers the extension of the existing primary allocation to the meteorological-satellite service in the band 7 750-7 850 MHz to the band 7 850-7 900 MHz. Applications in the meteorological sa
11、tellite service are limited to non-geostationary satellites transmitting in the space-to-Earth direction. Although the same service applications are affected as in the current allocation 7 750-7 850 MHz, and noting that meteorological systems already share this band successfully with the fixed servi
12、ce, this assessment covers all potential modes of operation and compatibility aspects for the potential extension to 7 850-7 900 MHz. 2 Background Several polar orbiting meteorological satellite systems are currently using or planning to use the band 7 750-7 850 MHz. The main mode of operation is da
13、ta transmission to a dedicated earth station in high latitudes, such as Svalbard on Spitsbergen, Norway. One of the systems operates in a multi-user mode transmitting meteorological data to a number of user stations, operated mainly by national weather services. Table 1 shows typical data of the 3 r
14、epresentative systems EUMETSAT polar-orbiting meteorological satellite system (Metop), United States National Polar-orbiting Operational Environmental Satellite System (NPOESS) and the second generation of polar-orbital meteorological satellites of China (FY-3). The measurements and observations per
15、formed by those MetSat systems, provide data used in the areas of operational meteorology, climate monitoring, and detection of global climatic changes, having significantly improved operational meteorology, in particular the Numerical Weather Prediction (NWP). Determined by the users of those data,
16、 namely the National Weather Services, next generation of these non-geostationary MetSat systems will have to provide continuity to the measurements and observations performed by the current systems. Furthermore, these future systems will have to perform additional measurements and observations of m
17、eteorological and climate parameters with higher resolution, resulting in much higher data rates and bandwidth as required today. The necessary bandwidth for the downlink of the raw instrument data for future non-geostationary MetSat systems that fulfil those requirements for further enhanced data i
18、n the area of operational meteorology and climatology would be up to 150 MHz. Rep. ITU-R SA.2164 3 TABLE 1 Characteristics of some meteorological satellite system applications in the band 7 750-7 850 MHz Metop NPP NPOESS FY-3 Carrier frequency (MHz) 7800 7812 7834 7775 Orbit height (km) 817 824 828
19、836 Maximum bandwidth (MHz) 63.0 30 30.8 45.0 Modulation scheme QPSK QPSK SQPSK QPSK Satellite EIRP (dBW) 13.5 12.9 20.4 19.6 Earth station antenna diameter (m) 10.0 3.0 2.0 3.0 Earth station antenna gain (dBi) 55.2 44.9 41.7 45.2 Maximum PFD on surface of earth (dB(W/m2 4 kHz) 165.9 162.9 155.6 158
20、.1 Margin with respect to PFD limit (dB) 13.9 10.9 3.6 6.1 The desired extension of the MetSat allocation into the band 7 850-7 900 MHz would only affect the same radiocommunication services, namely the FIXED and MOBILE (except aeronautical mobile) service, like in the band 7 750-7 850 MHz where the
21、 METSAT service is already allocated on a co-primary basis limited to NGSO applications. Compatibility was already demonstrated in preparation for (WRC-97) where the allocation to the MetSat in the band 7 750-7 850 MHz was originally added to the table of allocations in Article 5 of the Radio Regula
22、tions (RR). Studies conducted prior to (WRC-97) concluded that more than 13 dB of margin were available to protect fixed service systems operating with worst case azimuths along the sub-satellite track. In particular the interference impact on the fixed and mobile service from the downlink of a pola
23、r-orbiting MetSat system like Post-EPS to its dedicated earth station is very limited as such an earth station is deployed at high northern (Svalbard, Spitsbergen) or southern latitudes (McMurdo, Troll, OHiggens, Antarctica) in order to avoid blind orbits in which the stored instrument data of an en
24、tire orbit cannot be received. For other applications such as the dissemination of data directly to the user (so-called direct read-out), for which the number of reception stations could be higher and which could be located anywhere, the sharing situation needs to be studied. Currently there are two
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