1、QUESTION ITU-R 202-1/7*Protection criteria and frequency sharing between space very long baseline interferometry and other space research systems (1993-1997) The ITU Radiocommunication Assembly, considering a) that there are requirements to use spacecraft for conducting very long baseline interferom
2、etry (VLBI); b) that space VLBI observations usually require wideband data transmission in the space-to-Earth direction; c) that space VLBI systems require precision uplink and corresponding downlink phase reference signals which need to be protected from interference; d) that there may be a potenti
3、al for mutual interference when space VLBI systems are operated in the same frequency bands used by other space research systems, decides that the following Question should be studied 1 How do the technical and operating characteristics of space VLBI systems affect the feasibility of sharing with ot
4、her space research systems? 2 Under what conditions is it feasible for space VLBI systems to share frequency bands with other space research systems? 3 What frequency bands are suitable for sharing between space VLBI systems and other space research 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.
