1、QUESTION ITU-R 82/6*Technical characteristics of feeder links to broadcasting satellites operating in the 12, 17 and 21 GHz bands (1993-2000) The ITU Radiocommunication Assembly, considering a) that under the Radio Regulations, the Earth-to-space paths used for the feeder links between earth station
2、s at specified fixed points and satellites used for services other than the fixed-satellite service (FSS) (including the broadcasting-satellite service (BSS), all the mobile-satellite services, all the radionavigation-satellite services, the meteorological-satellite service, and the Earth-exploratio
3、n satellite service) are a part of the FSS; b) the need for ample information on the characteristics of feeder links for planning the BSS; c) that in the implementation of broadcasting-satellite systems, consideration must be given to all aspects of associated space operation service functions (trac
4、king, telemetry, telecommand and ranging) in connection with the operation of broadcasting satellites; d) that in the implementation of feeder links serving the BSS, full consideration should be given to the operational requirements of that service; e) that a number of different FSS (Earth-to-space)
5、 bands including FSS (Earth-to-space) allocations either identified for or restricted to feeder link use by WARC-92 are potentially available for feeder links to future broadcasting satellites that use the bands allocated to the BSS at WARC-92, decides that the following Question should be studied 1
6、 What are the most appropriate technical characteristics for feeder links for the BSS and what is the most appropriate method for utilizing the radio-frequency channels of the feeder links in the allocated bands; in particular, those characteristics which would be necessary to permit frequency assig
7、nments for different orbital positions to be made independently of each other? 2 Is there any consequent limitation on the orbital position resulting from other design features of the feeder-link earth station(s)? 3 What are the techniques that could be used in the feeder-link considerations which c
8、ould result in an efficient flexible and economic design of the overall service? 4 What are the technical considerations which need to be considered in the choice of frequency for the feeder links relative to the downlink frequency? NOTE 1 See Recommendations ITU-R BO.652 and ITU-R BO.1296, further decides 1 that the results of the above studies should be included in (a) Recommendation(s); *This Question should be brought to the attention of Radiocommunication Study Group 4. 2 that these studies should be completed by 2003. _
