ITU-R RS 1749-2006 Mitigation technique to facilitate the use of the 1 215-1 300 MHz band by the Earth exploration-satellite service (active) and the space research service (active.pdf
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1、 Rec. ITU-R RS.1749 1 RECOMMENDATION ITU-R RS.1749 Mitigation technique to facilitate the use of the 1 215-1 300 MHz band by the Earth exploration-satellite service (active) and the space research service (active) (Question ITU-R 234/7) (2006) Scope This Recommendation describes the mitigation techn
2、ique of using filtering with Fourier transformation of the received signal. This technique applies to interference to synthetic aperture radars (SARs) in the 1 215-1 300 MHz band from other services with relatively small bandwidth. This Recommendation also provides typical parameters for spaceborne
3、active sensors to be used in the development of additional mitigation techniques. The ITU Radiocommunication Assembly, considering a) that the 1 215-1 300 MHz band is allocated on a primary basis to the Earth exploration-satellite service (active); b) that this band is used by spaceborne synthetic a
4、perture radars (SARs) which applications are to monitor, under all-weather and day and night conditions, deformation of the Earths surface in most land areas, natural disasters, the environment, forests, land use, and others; c) that the 1 215-1 300 MHz band is also allocated to the radiolocation se
5、rvice on a primary basis, and to the radionavigation service on a primary basis in a certain number of countries; d) that Recommendations ITU-R SA.516 and ITU-R SA.1282 show that the operation of SARs is possible without harmful interference in the same frequency band as systems operating in the rad
6、iolocation service, including wind profiler radars, with the possible exception of radio-location service systems using frequency-modulated pulsed radars; e) that performance and interference criteria of spaceborne active sensors are given in Recommendation ITU-R SA.1166; f) that air route surveilla
7、nce radars (ARSRs) with higher isotropically radiated powers than the main beam powers of wind profiler radars have been in operation in this band for many years and harmful interference to spaceborne active sensor operations is normally not observed, although degraded performance is sometimes obser
8、ved which may be attributed to ARSR transmissions, recommends 1 that a mitigation technique applicable to the spaceborne active sensors as shown in Annex 1 could be used to reduce interference from radiolocation and radionavigation radar systems operating in the 1 215-1 300 MHz band to these sensors
9、; 2 that typical parameters of spaceborne active sensors operating in the 1 215-1 300 MHz band given in Annex 2 should be used in the development of additional mitigation techniques. 2 Rec. ITU-R RS.1749 Annex 1 Mitigation technique for interference to spaceborne SARs 1 Introduction At some location
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