Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 International Civil Aviation Organization Regional Preparatory Group (RPG) Meeting for World Radiocommunication Conference 2007 (WRC-2007), ACP Working Group B and F and NSP SSG Meetings. Bangkok, Thailand, February RPG/ACP/NSP pres4 Agenda Item 5 SPECIFICS ON FM BROADCAST INTERFERENCE AND LATEST WORK presentation by Steve Mitchell

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 A LITTLE BIT OF HISTORY Changes to ITU Radio Regulations recognition of potential interference to aeronautical systems studies within the ITU initial studies further enhanced studies final ITU recommendations

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 GENERAL TYPES OF INTERFERENCE Four types of interference to consider Type A A1 A2 Type B B1 2 signal 3signal B2

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 DIFFICULTIES WITH ILS/VOR/COM Extensive testing ILS/VOR receivers 3rd order intermodulation saturation Com receivers ICAO Annex 10 SARPs requirements 3rd order 2 signal Desensitisation

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 DIFFICULTIES WITH GBAS AND VDL 4 Testing of GBAS and VDL 4 receivers same mechanisms apply as for ILS/VOR/COM avionics manufacturers tests above 112 MHz split in desensitisation requirements similar A1and B1 criteria as ILS/VOR ICAO Annex 10 SARPs requirements 3rd order 2 signal Desensitisation

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 Co-ordination Why co-ordination? Between FM broadcasters mutual sharing Between FM broadcasters and aeronautical avoid interference to aeronautical services Between aeronautical and FM broadcasters avoid potential problems

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 Example of co-ordination process Example of an approach to co-ordination European example inside a State databases computer tools agreement mechanism between States LEGBAC/EBU

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 TYPE A1 CALCULATION

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 TYPE A2 CALCULATION

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 TYPE B1 CALCULATION 2 SIGNAL

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 TYPE B1 CALCULATION 3 SIGNAL

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 TYPE B2 CALCULATION

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 TRIGGER AND CUT-OFF CALCULATIONS

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 ILS PROTECTION

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 VOR PROTECTION

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 CURRENT STATUS OF WORK ITU Working Party 8B Development of new recommendation Information on interference to FM receivers ICAO NSP SSG ICAO input to ITU

Nav, Spectrum & Surveillance RPG for WRC-2007, ACP WGs B&F and NSP SSG, Bangkok Feb 2005 FURTHER WORK WITHIN ICAO ILS GBAS No compatibility shown VDL 4 No compatibility shown