1、QUESTION ITU-R 139-3/7*Data transmission for Earth exploration-satellite systems (1990-1993-1995-2000) The ITU Radiocommunication Assembly, considering a) that the data transmission characteristics of Earth exploration-satellite systems, frequencies and bandwidths, and performance, interference and
2、frequency sharing criteria are established by Recommendations ITU-R SA.514, ITU-R SA.1024, ITU-R SA.1025, ITU-R SA.1026 and ITU-R SA.1027; b) that these systems may require very high transmission rates, decides that the following Question should be studied 1 What are the efficient spectrum utilizati
3、on techniques for high data rate transmission of Earth exploration-satellite systems? further decides 1 that the results of the above studies should be included in (a) Recommendation(s); 2 that the above studies should be completed by 2011. _ *In the year 2009, Radiocommunication Study Group 7 extended the completion date of studies for this Question.
