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ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE...

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ICAO Regional Spectrum Seminar, Cairo, Egypt J une 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK
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Page 1: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

SPECIFICS ON FM BROADCAST INTERFERENCEpresentation bySteve Mitchell, UK

Page 2: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

A LITTLE BIT OF HISTORY Changes to ITU Radio Regulations

recognition of potential interference to aeronautical systems

studies within the ITUinitial studiesfurther enhanced studiesfinal ITU recommendations

Page 3: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

GENERAL TYPES OF INTERFERENCE

Four types of interference to considerType A

A1A2

Type BB1

2 signal3signal

B2

Page 4: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

DIFFICULTIES WITH ILS/VOR/COM

Extensive testingILS/VOR receivers

3rd order intermodulationsaturation

Com receivers

ICAO Annex 10 SARPs requirements3rd order 2 signalDesensitisation

Page 5: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

DIFFICULTIES WITH GBASAND VDL 4

Testing of GBAS and VDL 4 receiverssame mechanisms apply as for ILS/VOR/COMavionics manufacturers tests above 112 MHz

split in desensitisation requirementssimilar A1and B1 criteria as ILS/VOR

ICAO Annex 10 SARPs requirements3rd order 2 signalDesensitisation

Page 6: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

Co-ordination

Why co-ordination?Between FM broadcasters

mutual sharing

Between FM broadcasters and aeronauticalavoid interference to aeronautical services

Between aeronautical and FM broadcastersavoid potential problems

Page 7: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

Example of co-ordination process

Example of an approach to co-ordinationEuropean example

inside a Statedatabasescomputer toolsagreement mechanism

between StatesLEGBAC/EBU

Page 8: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

TYPE A1 CALCULATION

Page 9: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

TYPE A2 CALCULATION

Page 10: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

TYPE B1 CALCULATION2 SIGNAL

Page 11: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

TYPE B1 CALCULATION3 SIGNAL

b) Three-signal case

N1 – 20 log max (0. 4; 108. 1 – f1)

0. 4

N2 – 20 log max (0. 4; 108. 1 – f2)

0. 4

N3 – 20 log max (0. 4; 108. 1 – f3)

0. 4 K 6 – Lc S 0 (11)

where:

f1, f2, f3 : broadcasting frequencies (MHz) f1 f2, f3

N1, N2, N3 : broadcasting signal levels (dBm) at the input to the aeronautical receiver for broadcastingfrequencies f1, f2 and f3 respectively

K 78 for ILS localizer and VOR

Lc : correction factor (dB) to account for changes in wanted signals, (see § 4.3.3.3)

S : 3 dB margin to take into account of the fact that the ICAO Annex 10 1998 receiver immunitycriteria equations do not provide comprehensive compatibility assessment formulae.

Page 12: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

TYPE B2 CALCULATION

Page 13: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

TRIGGER AND CUT-OFF CALCULATIONS

Page 14: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

ILS PROTECTION

Page 15: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

VOR PROTECTION

Page 16: ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK.

ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006

PRACTICAL SOLUTIONS

WITH AUDIENCE PARTICIPATION


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