1、 STD-ITU-R RECMN S.1254-ENGL L997 m LI855212 0530353 72T m 1 Rec. ITU-R S.1254 RECOMMENDATION ITU-R S. 1254 BEST PRACTICES TO FACILITATE THE COORDINATION PROCESS OF FIXED-SATELLITE SERVICE SATELLITE NETWORKS (Question IT-R 230/4) (1 997) The IT Radiocommunication Assembly, considering that in the pr
2、ocess of coordinating satellite systems, certain practices have led to successful and timely that in the process of coordinating satellite systems, certain practices have led to delays and unnecessary a) coordination results; b) expenses in the coordination process, recommends that the coordination
3、best practices contained in Annex 1 be used to the maximum extent possible; that the approaches listed in Annex 2 be avoided to the maximum extent possible. 1 2 ANNEX 1 Current best practices to facilitate the coordination process of Fixed-satellite service satellite networks Exchanging accurate and
4、 up-to-date satellite and service parameters on a regular and timely basis (exchange design parameters at the earliest possible time, update information to the Radiocommunication Bureau as soon as it is available). Obtaining multi-administration agreements on parameters which would facilitate coordi
5、nation. Uniform satellite spacing arrangements in segments of the orbital arc where practical. Designing satellite networks taking into account interference. Using band segmentation (see Recommendation ITU-R S.742). Use of digital modulation where practical. ANNEX 2 Practices which hamper the coordi
6、nation process Attempting to commence the coordination of satellites prior to knowledge of service parameters. Extensive warehousing of orbital slots for future use. Delaying the coordination process. Use of unnecessarily interference sensitive and interference causing system design. Assigning FM-TV carriers to frequencies without regard to operational conventions. Over-protection of assignment by publishing parameters with excessive margins.
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