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Agenda Item 5 SPECIFICS ON FM BROADCAST INTERFERENCE AND LATEST WORK presentation by

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, 21-25 February 2005. RPG/ACP/NSP pres4. Agenda Item 5

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Agenda Item 5 SPECIFICS ON FM BROADCAST INTERFERENCE AND LATEST WORK presentation by

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  1. International Civil Aviation OrganizationRegional Preparatory Group (RPG) Meeting for World Radiocommunication Conference 2007 (WRC-2007), ACP Working Group B and F and NSP SSG Meetings. Bangkok, Thailand, 21-25 February 2005.RPG/ACP/NSP pres4 Agenda Item 5 SPECIFICS ON FM BROADCAST INTERFERENCE AND LATEST WORK presentation by Steve Mitchell

  2. 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

  3. GENERAL TYPES OF INTERFERENCE • Four types of interference to consider • Type A • A1 • A2 • Type B • B1 • 2 signal • 3signal • B2

  4. 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

  5. DIFFICULTIES WITH GBASAND 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

  6. 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

  7. 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

  8. TYPE A1 CALCULATION

  9. TYPE A2 CALCULATION

  10. TYPE B1 CALCULATION2 SIGNAL

  11. TYPE B1 CALCULATION3 SIGNAL

  12. TYPE B2 CALCULATION

  13. TRIGGER AND CUT-OFF CALCULATIONS

  14. ILS PROTECTION

  15. VOR PROTECTION

  16. 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

  17. FURTHER WORK WITHIN ICAO • ILS • GBAS • No compatibility shown • VDL 4 • No compatibility shown

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