Frequency Management in the AFI Region

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Frequency Management in the AFI Region
Aeronautical Frequency Management
Seminar (Nairobi, 17 19 February 2004)

• Presented by
• A. Sene, RO/CNS, Nairobi

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Summary

• Definition
• Air Navigation Meetings
• Communications
• Navigation
• Regional Offices
• Role of States
• Conclusion

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Definition

• Frequency Management is
• The application at the international and national
  levels of regulatory and technical measures for
  the optimal use of the radio frequency spectrum.
• In the aeronautical field, it involves
• ICAO and
• Contracting States

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Air Navigation Meetings

• At the ICAO level, consensus is built at air
  navigation meetings
• Regional air navigation meetings
• Planning criteria and separation distances of
  stations
• frequency assignments done by States
• States to coordinate assignments with ICAO
• Regional planning and implementation groups
• In AFI
• AFI/7 RAN Meeting (Abuja, 1997)
• APIRG

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AFI/7 VHF Communications

• Assignment of frequencies in the band 117.975
  137.000 MHz should be based on 25-kHz channel
  spacing as specified in Annex 10 principles
• Geographical separation criteria
• See Appendix H, AFI/7 Report, Agenda 9
• AFI Basic ANP, Attachment F, Chapter IV
• APIRG to prepare VHF frequency utilization plan
  (distributed separately)
• Band 136-137 MHz to be reserved for VHF data
  links

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AFI/7 HF Communications

• Assignment of HF frequencies should be done in
  accordance with the allotment plan and technical
  principles contained in Appendix 27 Aer2 to the
  ITU Radio regulations

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Navigation

• AFI arrangement
• State concerned should coordinate new frequency
  assignment with the Regional Office of
  accreditation prior to the use of the frequency
• Assignments should be done in accordance with
  Annex 10 provisions

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Navigation 2

• VOR
• Frequency assignments should be selected in the
  band 111.975 117.975 MHz and in accordance with
  Annex 10, Vol. V, para. 4.2.3, and when
  associated with DME, with Annex 10, Vol. I, para.
  3.5.3.3.5
• VOR/DME 448 assignments
• ILS
• Assignments should be done in the band 108
  111.975 MHz in accordance with Annex 10, Vol V,
  para. 4.2.2 and Annex 10, Vol. I, para.
  3.1.6.1.1.
• ILS 202 assignments

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Regional Offices

• Regional Offices maintain lists of radio
  frequency assignments in the
• LF/MF band ? COM List 1
• VHF COM band ? COM List 3
• ILS/DME/VOR bands ? COM List 2
• The COM lists are published by the Dakar Office

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COM Lists
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Role of States

• States have an important role in frequency
  management
• Coordination with ICAO
• Notification to ITU-R of frequency
  assignments/cancellations (AFI/6 Rec. 13/13)
• promulgate regulations to protect critical areas
  of facilities and reduce interference (see Rec.
  8/6 and 8/7 LIM AFI 88)
• ITU WRC preparations/participation
• WRC focal points of contact and
• GNSS interference

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Conclusion

• Frequency management requires
• International consensus and coordination
• National implementation of agreed policies
• Coordination at State level
• In AFI region, provided there is coordination
  between States and ICAO, there should not be
  serious difficulties in usage of aeronautical
  spectrum.

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Thank You