1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.264-2000-MSW-E.DOC 17.10.03 15.07.10 QUESTION ITU-R 264/4 Technical and operational characteristics of networks of the fixed-satellite service operating above 275 GHz*(2000) The ITU Radiocommunication Assembly, considering a) that the s
2、pectrum in many of the frequency bands used for space radiocommunication is increasingly congested and this problem is expected to get worse; b) that telecommunication links are being used or planned for use on some satellite systems for inter-satellite communications at frequencies above 275 GHz; c
3、) that the viability of telecommunication links operating above 275 GHz (space-to-Earth and Earth-to-space) is currently being investigated; d) that at frequencies above 275 GHz, sharing between services is not precluded; e) that extensive research has already been done and standards established on
4、the hazards of radiation at frequencies above 275 GHz through the International Electrotechnical Commission in standard IEC 60825-1 and the American National Standards Institute in standard ANSI Z136.1-1993; f) that the focus of study of Questions by Radiocommunication Study Groups includes the foll
5、owing: use of the radio-frequency spectrum in space radiocommunication; characteristics and performance of radio systems; operation of radio systems, decides that the following Question should be studied 1 What are the technical and operational characteristics of Earth-to-space, space-to-Earth, and
6、space-to-space links at frequencies above 275 GHz on geostationary orbits (GSO) and non-GSO fixed-satellite service (FSS) networks? 2 Are sharing studies required for FSS networks operating at frequencies above 275 GHz? further decides 1 that the results of studies above 275 GHz should be brought to
7、 the attention of the other Study Groups; 2 that the results of the above studies should be included in one or more Recommendations; 3 that preliminary results of the studies should be available by 2006. _ *The frequency spectrum above 275 GHz is currently not allocated (see also No. 5.565 of the Radio Regulations). - 2 - 4/1-E C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.264-2000-MSW-E.DOC 17.10.03 15.07.10 _
