ITU-R SF 1649-1-2008 Guidance for determination of interference from earth stations on board vessels to stations in the fixed service when the earth station on board vessels is wit.pdf
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1、 Rec. ITU-R SF.1649-1 1 RECOMMENDATION ITU-R SF.1649-1 Guidance for determination of interference from earth stations on board vessels to stations in the fixed service when the earth station on board vessels is within the minimum distance*(Questions ITU-R 226/9 and ITU-R 254/4) (2003-2008) Scope Thi
2、s Recommendation provides guidance to administrations for the determination of the interference potential of earth stations on board vessels (ESVs) to stations in the fixed service. Annex 1 provides general considerations for this determination. Annex 2 provides a description of the most basic appro
3、ach to such a determination. Annex 3 provides several alternative approaches based on simulations. Annex 4 contains material that may be considered in bilateral and multilateral discussion when administrations authorize antennas smaller than 1.2 m in the 14.0-14.5 GHz band to ensure that these small
4、er antennas are in compliance with the requirements of Resolution 902 (WRC-03). The ITU Radiocommunication Assembly, considering a) that vessels may be equipped to operate FSS ESVs which transmit in the FSS networks in the 5 925-6 425 MHz band (Earth-to-space) under No. 4.4 of the Radio Regulations
5、(RR); b) that vessels may be equipped to operate as ESVs in the 14-14.5 GHz band under RR No. 4.4 or as secondary service in the MSS; c) that some of the bands in considering a) and b) are shared on a co-primary basis with the fixed service (FS); d) that if ESVs were to be permitted to operate in se
6、a-lanes and channels near to shore it would be necessary to define composite areas for these operations; e) that Recommendation ITU-R SF.1585 provides a way to define such an area; f) that stations in the FS within such an area must be examined to determine whether they will experience more than a p
7、ermissible amount of interference; g) that many FS digital systems operate under automatic transmit power control (ATPC); h) that interference events of more than a few seconds can result in significant long-term outages in digital FS systems; j) that Recommendations ITU-R SF.1006 and/or ITU-R SM.14
8、48 provide methods that could be used for the determination of interference potential between stations in the FSS and stations in the FS when the ESVs are stationary (see Note 1); *For the definition of “minimum distance”, see Recommendation ITU-R SF.1650-1. 2 Rec. ITU-R SF.1649-1 k) that the method
9、ology for determining the level of interference from ESVs to FS stations is a matter for agreement between the administrations concerned; l) that guidance to administrations on the detailed determination of these levels for performing a preliminary analysis may nonetheless be of value to some in the
10、 detailed assessment of interference; m) that Recommendations ITU-R F.696 and ITU-R F.1565 define permissible interference criteria for stations in the FS; n) that different methods and interference criteria are needed to determine the interference potential from ESVs when these are not fixed, recog
11、nizing a) that the World Radiocommunication Conference (Istanbul, 2000) (WRC-2000) called for ITU-R to urgently complete its studies related to earth stations on board vessels (ESVs), in particular not to have the potential to cause unacceptable interference to stations of other services of any admi
12、nistration; b) that the RR No. 5.457A specifies that earth stations on board vessels in the bands 5 925-6 425 MHz and 14-14.5 GHz may communicate with space stations of the fixed-satellite service as long as such use is in accordance with Resolution 902 (WRC-03); c) that the RR No. 5.457B specifies
13、that earth stations located on board vessels in the bands 5 925-6 425 MHz and 14-14.5 GHz may operate in Algeria, Saudi Arabia, Bahrain, Comoros, Djibouti, Egypt, United Arab Emirates, the Libyan Arab Jamahiriya, Jordan, Kuwait, Morocco, Mauritania, Oman, Qatar, the Syrian Arab Republic, Sudan, Tuni
14、sia and Yemen on a secondary basis in the maritime mobile-satellite service with the characteristics and under the conditions contained in Resolution 902 (WRC-03), noting a) that the technical limitations for ESV operation given in Annex 2 of Resolution 902 (WRC-03), in particular the off-axis limit
15、s, are applicable in determining the potential for interference; b) that Recommendation 37 (WRC-03) (Operational procedures for earth stations on board vessels (ESVs) use) gives the procedures for the operation of ESVs, recommends 1 that the guidance described in Annex 1 may be used as a framework f
16、or the overall assessment of interference from ESVs operating within the “minimum distance” to stations in the FS; 2 that the guidance in Annex 2 may be used as the basis for the calculation of interference from ESVs (see Note 2 and Note 3); 3 that results of the application of the method in Annex 2
17、 can be used to determine whether portions of the frequency bands in considering b) may be considered for use by ESVs when operating within the “minimum distance”(see Note 3); 4 that the technical material in Annex 4 may be considered by administrations in their bilateral and multilateral discussion
18、s when authorizing ESVs operating with antennas smaller than 1.2 m in the band 14.0-14.5 GHz to ensure that these smaller antennas are in compliance with the requirements of Resolution 902 (WRC-03). Rec. ITU-R SF.1649-1 3 NOTE 1 The methods given in this Recommendation make use of FS interference pr
19、otection criteria. As an example, Recommendation ITU-R SF.1006 provides such criteria but the short-term criteria may only be compliant with ITU-T Recommendation G.821. On the other hand, Recommendation ITU-R SF.1650 provides FS short-term protection criteria for up-to-date links designed to meet th
20、e requirements of ITU-T Recommendations G.826 and G.828. NOTE 2 When identifying frequencies for ESVs, mitigation techniques may need to be considered. For example, in the case where the FS frequency arrangements are based on Recommendation ITU-R F.383, the use of the 6 GHz FS central band (close to
21、 6.175 GHz) by the ESV transmitters can significantly reduce the potential interference to the FS receivers since, when considering interference to any FS channel, there would be benefit from receiver filtering. NOTE 3 The method in Annex 2 may be supplemented by the use of the method in Annex 3. An
22、nex 1 Guidance for identifying and using points on the operating contour*for the determination of interference from emissions from an ESV in motion to a station in the fixed service (critical contour point method) The following method may be used as a framework for the overall assessment of interfer
23、ence from ESVs operating within the minimum distance to stations in the FS. 1 Introduction The method for assessing interference potential between a station in the FSS and a station in the FS is provided in Recommendation ITU-R SF.1006, which assumes that the FSS and the FS stations have a fixed spa
24、tial relationship. ESVs moving into a port or harbour to a dock or anchorage have a variable relationship with FS stations while in motion. Recommendation ITU-R SF.1585 describes a method for using the operating contour of ESV-equipped vessels to determine an area which can be used in identifying th
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