Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 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 Spectrum Management Seminar, Nairobi Feb 2004 GENERAL TYPES OF INTERFERENCE Four types of interference to consider Type A A1 A2 Type B B1 2 signal 3signal B2

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 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 Spectrum Management Seminar, Nairobi Feb 2004 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 Spectrum Management Seminar, Nairobi Feb 2004 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 Spectrum Management Seminar, Nairobi Feb 2004 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 Spectrum Management Seminar, Nairobi Feb 2004 TYPE A1 CALCULATION

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 TYPE A2 CALCULATION

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 TYPE B1 CALCULATION 2 SIGNAL

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 TYPE B1 CALCULATION 3 SIGNAL

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 TYPE B2 CALCULATION

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 TRIGGER AND CUT-OFF CALCULATIONS

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 ILS PROTECTION

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 VOR PROTECTION

Nav, Spectrum & Surveillance Spectrum Management Seminar, Nairobi Feb 2004 PRACTICAL SOLUTIONS WITH AUDIENCE PARTICIPATION