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SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK. 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.

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specifics on fm broadcast interference presentation by steve mitchell uk

SPECIFICS ON FM BROADCAST INTERFERENCEpresentation bySteve Mitchell, UK

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

a little bit of history
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

general types of interference
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

difficulties with ils vor com
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

difficulties with gbas and vdl 4
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

co ordination
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

example of co ordination process
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

type a1 calculation
TYPE A1 CALCULATION

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

type a2 calculation
TYPE A2 CALCULATION

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

type b1 calculation 2 signal
TYPE B1 CALCULATION2 SIGNAL

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

type b1 calculation 3 signal
TYPE B1 CALCULATION3 SIGNAL

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

type b2 calculation
TYPE B2 CALCULATION

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

trigger and cut off calculations
TRIGGER AND CUT-OFF CALCULATIONS

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

ils protection
ILS PROTECTION

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

vor protection
VOR PROTECTION

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

practical solutions
PRACTICAL SOLUTIONS

WITH AUDIENCE PARTICIPATION

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

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