1、172 Rec. ITU-R SM.1054 RECOMMENDATION ITU-R SM. 1054 MONITORING OF RADIO EMISSIONS FROM SPACECRAFT AT MONITORING STATIONS (Question ITU-R 27/1) (1994) The IT Radiocommunication Assembly, considering that the number of satellites and associated uplink terminals is increasing; that as a result there i
2、s an increasing number of cases of interference; that the economic aspects of satellite systems become more and more important by the installation of new a) b) c) applications such as radiodetennination satellite systems and fleet management; d) service; that some frequency bands used by satellites
3、are shared with terrestrial services and the radioastronomy e conventional monitoring stations; f) that there is a growing demand for information by frequency management agencies; g) that there are allocations to the mobile-satellite services for use in case of distress or emergency; h) that monitor
4、ing stations for emissions from spacecraft are expensive; j) Recommendation No. 32 of the Second Session of the World Administrative Radio Conference on the Use of the Geostationary-Satellite Orbit and on the Planning of Space Services Utilizing it (Geneva, 1988) (WARC ORB-88) on International Monit
5、oring of Emissions Originating from Space Stations, that because of the necessity for different techniques, emissions from spacecraft cannot be monitored by recommends 1. account the need for monitoring; 2. minimum number of monitoring stations. Nore I -Further studies should be carried out to ident
6、ify the means of determining the sources of uplink interference. that when administrations utilize the frequency bands allocated for satellite services they should take into that administrations are encouraged to cooperate so that appropriate monitoring can be obtained with a ITU-R RECMM*SM* LO54 94 4855232 0523338 497
