1、 QUESTION ITU-R 235-1/7*Technical and operational characteristics of applications of science services*operating above 275 GHz*(2000-2006) The ITU Radiocommunication Assembly, considering a) that the spectrum in many of the frequency bands used for space radiocommunication is increasingly congested a
2、nd this problem is expected to get worse; b) that some current space research, Earth exploration, meteorological and astronomical systems utilize frequencies above 275 GHz and additional ones are planned; c) that communication links are being used or planned for some satellite systems for inter-sate
3、llite communications at frequencies above 275 GHz; d) that extensive research has already been done and standards established on the hazards of radiation at frequencies above 275 GHz through the International Electrotechnical Commission in standard IEC 60825-1 and the American National Standards Ins
4、titute in standard ANSI Z136.1-1993; e) that at frequencies above 275 GHz, sharing between services is not precluded; f) that the study of Questions by Radiocommunication Study Groups includes the following: use of the radio-frequency spectrum in space radiocommunication; characteristics and perform
5、ance of radio systems; operation of radio systems, decides that the following Question should be studied 1 What are the technical and operational characteristics of systems operating at frequencies above 275 GHz within the science services? 2 Are sharing studies required for systems operating at fre
6、quencies above 275 GHz within the science services? _ *In the year 2009, Radiocommunication Study Group 7 extended the completion date of studies for this Question. *As used in this Question, the phrase “Science services” refers to Earth exploration-satellite (EESS), space research (SRS), space oper
7、ation (SOS), radio astronomy (RAS), meteorological-satellite (MetSat), and meteorological aids (MetAids) services. *The frequency spectrum above 275 GHz is currently not allocated (see also No. 5.565 of the Radio Regulations). - 2 - further decides 1 that the results of studies above 275 GHz should be brought to the attention of the other Study Groups; 2 that the results of the above studies should be included in (a) Recommendation(s) or (b) Reports; 3 that the results of the studies should lead to the formulation of appropriate Recommendations or Reports by 2010. Category: S2
