1、 QUESTION ITU-R 234/7*Frequency sharing between active sensor systems in the Earth exploration-satellite service and systems operating in other services in the 1 215-1 300 MHz band (2000) The ITU Radiocommunication Assembly, considering a) that the characteristics of Earth exploration-satellite syst
2、ems (EESS)(active), frequencies and bandwidths, and performance, interference and frequency sharing criteria are laid down by Recommendations ITU-R SA.577, ITU-R SA.1166; b) that WRC-97 allocated the frequency band 1 215-1 300 MHz to the spaceborne active sensors of the EESS with footnote constraint
3、s 5.332 on a primary basis; c) that No. 5.332 states that in the band 1 215-1 300 MHz, spaceborne active sensors in the Earth exploration-satellite service and space research service shall not cause harmful interference to, claim protection from, or otherwise impose constraints on operation or devel
4、opment of the radiolocation service, the radionavigation-satellite service and other services allocated on a primary basis; and that wind profiler radars operate in the radiolocation service; d) that ITU-R studies show that sharing between spaceborne synthetic aperture radars and terrestrial radars
5、is feasible except for frequency-modulated pulsed radar; e) that mitigation techniques may be applied to the spaceborne active sensors if required to improve sharing feasibility between spaceborne active sensors and radiolocation radar systems operating in the band 1 215-1 300 MHz, decides that the
6、following Question should be studied 1 What are the possibilities and conditions for frequency sharing between spaceborne active sensor systems in the EESS and systems operating in other services in the 1 215-1 300 MHz band? 2 What are the possible interference mitigation techniques that could be us
7、ed by spaceborne active sensors to facilitate sharing in the 1 215-1 300 MHz band? 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.
