ITU-R SF.674-2 SPANISH-2002 Determination of the impact on the fixed service operating in the 11.7-12.2 GHz band when geostationary fixed-satellite service networks in Region 2 exceed power flux-density thresholds in Resolution 77 (WRC-2000)
This Annex expands upon the methodology that is used in Recommendation ITU-R F.1107 for analogue FS systems and Recommendations ITU-R F.1107 and ITU-R F.1108 for digital FS systems. Recommendation ITU-R SF.358 provides guidance as to how satellite network pfd levels that protect the FS should be determined. Appendix 1 to Annex 2 of that Recommendation indicates that the absolute values of pfd should be selected in such a way that the maximum permissible interference power of Recommendation ITU-R SF.357 (1 000 pW) would be exceeded in a small fraction of the FS systems sharing that band for analogue FS stations. Recommendation ITU-R F.1108 uses the concept of fractional degradation of performance (FDP) for digital FS stations. The FDP is the fractional increase in the percentage of time that the controlling performance criterion will not be met because of the presence of interference. Recommendation ITU-R F.1108 suggests a value of 10?% for FDP as appropriate for sharing studies. Accordingly, the methodologies described here will determine the fraction of FS receivers for which the FDP will exceed 10%. The FDP should exceed 10% for no more than an agreed small percentage of the terrestrial stations. Appendix 1 discusses the methodology used to analyse interference into analogue fixed systems and Appendix 2 discusses the methodology used to analyse interference into digital systems. It should be noted that neither of the methodologies presented here makes use of any orbital avoidance.
ITU-R SF.674-2 SPANISH-2002 history
2002ITU-R SF.674-2 SPANISH-2002 Determination of the impact on the fixed service operating in the 11.7-12.2 GHz band when geostationary fixed-satellite service networks in Region 2 exceed power flux-density thresholds in Resolution 77 (WRC-2000)