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FM Broadcast Interference: Solutions and Co-ordination Process for Aeronautical Systems

This presentation by Steve Mitchell at the ICAO Regional Spectrum Seminar in Cairo, Egypt in June 2006 discusses the history and types of interference to aeronautical systems caused by FM broadcasts. It covers difficulties with ILS/VOR/COM, GBAS and VDL 4, co-ordination processes, and practical solutions.

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FM Broadcast Interference: Solutions and Co-ordination Process for Aeronautical Systems

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  1. SPECIFICS ON FM BROADCAST INTERFERENCEpresentation bySteve Mitchell, UK ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  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 ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  3. GENERAL TYPES OF INTERFERENCE • Four types of interference to consider • Type A • A1 • A2 • Type B • B1 • 2 signal • 3signal • B2 ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  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 ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  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 ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  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 ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  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 ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  8. TYPE A1 CALCULATION ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  9. TYPE A2 CALCULATION ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  10. TYPE B1 CALCULATION2 SIGNAL ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  11. TYPE B1 CALCULATION3 SIGNAL ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  12. TYPE B2 CALCULATION ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  13. TRIGGER AND CUT-OFF CALCULATIONS ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  14. ILS PROTECTION ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  15. VOR PROTECTION ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

  16. PRACTICAL SOLUTIONS WITH AUDIENCE PARTICIPATION ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

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