1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG04.236-1995-MSW-E.DOC 17.10.03 15.07.10 QUESTION ITU-R 236/4 Interference criteria and calculation methods for the fixed-satellite service (1995) The ITU Radiocommunication Assembly, considering a) that the Radiocommunication Bureau (BR),
2、in carrying out its duties under Articles 9 and 11 of the Radio Regulations, is required to calculate potential interference between networks of all types in the fixed-satellite service and to compare the results of such calculations with appropriate criteria; b) that the BR has requested guidance f
3、rom Study Group 4 on the methods to be employed for the calculation of the interference within the fixed-satellite service (FSS), and on the criteria to be used for comparison; c) that a similar BR request in respect of interference between FSS networks and networks of the fixed service has been add
4、ressed to Working Party 4-9S; d) that it would be convenient for the BR to have a single document containing the calculation methods and criteria applicable to all combinations of interfering and victim FSS carrier types, in as concise a form as practicable; e) that interference criteria and calcula
5、tion methods are currently available in ITU-R Recommendations for most, but not all, combinations of carrier types in the FSS; f) that most, but not all, of the available FSS interference criteria and calculation methods are currently summarized in Recommendation ITU-R S.741; g) that Recommendation
6、ITU-R S.1150 gives guidance on circumstances in which the probability of harmful interference between FSS carriers can be considered to be negligible, decides that the following Question should be studied 1 Which combinations of interfering and victim FSS carrier types are covered by other ITU-R tex
7、ts on interference calculation methods and criteria but not included in Recommendation ITU-R S.741? 2 To what extent does Recommendation ITU-R S.741 present the FSS interference calculation methods and criteria available elsewhere in Study Group 4 texts, in a form which can be used by the BR without
8、 the need to refer to those texts? 3 Which combinations of interfering and victim FSS carriers are not currently covered by Study Group 4 texts describing interference criteria and/or calculation methods, and what criteria and calculation methods are appropriate for such combinations? 4 What should
9、be the structure and status of a single document, designed for use by the BR in carrying out its duties under RR Articles 9 and 11, and containing the outcome of decides 3? further decides 1 that the results of these studies should lead: - 2 - 4/1-E C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLO
10、ADSR-QUE-SG04.236-1995-MSW-E.DOC 17.10.03 15.07.10 a) to an update of Recommendation ITU-R S.741 in respect of decides 1 and 2, and b) to answers to the questions in decides 3 and 4 as and when additional criteria and calculations are developed in the normal course of the work of Study Group 4. 2 that the above studies should be completed by 2006. _
