ITU-R QUESTION 116-2003 Polarization of emissions in the terrestrial broadcasting service《地面广播服务的排放极化》.pdf

1、HTTP:/WWW.ITU.INT/DMS_PUB/ITU-R/OPB/QUE/R-QUE-SG06.11-2001-MSW-E.DOC 18.09.03 15.07.10Radiocommunication Study Group 6QUESTION ITU-R 11/6Polarization of emissions in the terrestrial broadcasting service(1978-1982-1990-2001)The ITU Radiocommunication Assembly,consideringa) that emissions from terrest

2、rial broadcasting stations are usually transmitted with eitherhorizontal or vertical polarization;b) that multiple reflections within reception areas in rough terrain and/or in cities with highbuildings can result in undesirable effects in the received signal;c) that orthogonal polarization for broa

3、dcasting stations operating in the same frequencychannel has been used in some areas in discriminating against the reception of undesired signals,decides that the following Question should be studied1 are there advantages, both in improving the quality of the received signal where multiplereflection

4、s are present and in minimizing interference from other stations operating in the samefrequency channel, in using circular or elliptical polarization for emissions from terrestrialbroadcasting stations?2 what types of antennas can be used for transmission and reception?3 would the use of circular or

5、 elliptical polarization be compatible with the use of horizontaland/or vertical polarization in the same reception area?further decides1 that the results of the above studies should be included in (a) Recommendation(s);2 that the above studies should be completed by 2006._INTERNATIONAL TELECOMMUNICATION UNIONRADIOCOMMUNICATIONSTUDY GROUPSDocument 6/1-E8 June 2003Original: English