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INTERNATIONAL CIVIL AVIATION ORGANIZATION

ELEVENTH INFORMAL MEETING ON THE AERONAUTICAL COMMUNICATION PANEL WORKING GROUP F

(ACP WG-F/11)(Nairobi, 20 – 27 February 2004)

ACP WG-F/11 – WP/25

AGENDA ITEM 9: Review of agenda for WRC07; development of the draft ICAO position Resolution 415(WRC –03)AFISNET:An instrument of Intra/Inter Regional Co-operation supporting Air Navigation services

(Presented by ASECNA)


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I- SUMMARYThe present Working Paper is a contribution as an existing solution to the resolution 415; it is a cooperative approach, which has permitted to set up in AFI Region an appropriate communication infrastructure that meets the evolving requirements of modern civil aviation. From the beginning, AFISNET(African and Indian Ocean Satellite Network) has been designed as an instrument for regional integration, to provide digital and modern aeronautical satellite communications. It also permitted to eliminate the shortcomings and deficiencies in terms of ATS services implementation.In so doing, it contributes to improve the air navigation safety in AFI Region.


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II- BACKGROUND

For the reliability of the Aeronautical Fixed and Mobile services in the ACCRA, BRAZZAVILLE, KANO, N’DJAMENA and NIAMEY FIR, a satellite telecommunications network for Central and West Africa named initially AEROSATEL and now AFISNET was Initiated by ICAO and Funded by the European Economic Community (EEC).


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It was Implemented by ALCATEL from 1992 to 1995.AEROSATEL comprised a total of fifteen earth stations. In KANO and LAGOS two INTELSAT standard B earth stations (Antenna of 11m) and thirteen INTELSAT standard F2 earth stations (antenna of 7.30m) in ACCRA, ABUJA, BANGUI, BRAZZAVILLE,DOUALA, ILORIN, JOS, LIBREVILLE, MAIDIGURI, NDJAMENA,NIAMEY, PORT HARCOURT and SOKOTO.A representation of the network is shown in Figure 1


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10

15 6

8

1

14

13

9

12

11

3 5

4

2

7

1. KANO 2. MAIDUGURI 3. JOS 4. SOKOTO 5. ABUJA 6. LAGOS 7. ILORIN 8. PORT HARCOURT 9. BRAZZAVILLE10.NIAMEY11. N'DJAMENA12. BANGUI13. LIBREVILLE14. DOUALA15. ACCRA

Regional links

Links in Nigéria

Aerosatel Network

FIGURE 1: AEROSATEL


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III- AN INSTRUMENT OF INTRA/INTER REGIONALCO-

OPERATION SUPPORTING AIR NAVIGATION SERVICES:

INTRA-REGIONAL CO-OPERATION: Within the framework of the project, a Satellite Network

Management Committee (SNMC) was set up, involving:• GCAA for GHANA, NAMA for NIGERIA, ASECNA,

ROBERTS FIR, ICAO and European Union• The suppliers of equipment: (ALCATEL, ALENIA and

CORIS), participating in the Committee as Observer


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An Engineer from IAL(English design Office) named by the European Union ensured the co-ordination. The objectives of the management Committee are :

the network extension on free participation basis the interoperability (integration) with other African networksthe periodic review of the technical and operational performance of the networkthe co-operation in various areas, between the responsible for the concerned centres in terms of exchange of technicians, experience sharing, mutual assistance in case of earth station system failure.


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This co-operation allowed a transfer of technology and an undeniable know-how to the members participating in the network life. In so doing, The members gained significant experience and expertise in respect of the implementation, installation, exploitation and maintenance of ground station systems, supporting aeronautical telecommunications.Due to the non-renewable by the European Union of the technical assistance contract; the current members decided for :

Meeting Co-ordination :the hosting administration should act as the co-ordinatorwith assistance from ICAO ;•Frequency Of Meetings :the SNMC meeting shall be held once a year on a rotation basis


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Considering APIRG/10 guideline and in accordance with AFI/7recommendation 9/2, it was noted a remarkable extension of the basic network in:

• all ASECNA area(including Madagascar)• ROBERTS FIR • MAURITIUS, • REUNION and MAYOTTE • the COMOROS • SOUTH AFRICA• FRANCE

AFISNET comprises today fifty four earth stations(of which , thirty nine(39) belong to ASECNA)distributed in twenty-two States, as indicated in figures 2 and 3.Negotiations in progress will expand the network in Angola, Algeria and Sao Tome &Principe.


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AFISNET MAP

Cot

onou

Lagos

Bamako NYM

Kano NDJ

BanguiDouala

Libreville

Brazzaville

Tana

Mahga

Toamasina

Liaison IBS réaliséesLiaison FASTCOM réalisées

Station qualifiée B (11 m)

Station qualifiée F2 (7,30m)

Station qualifiée F1 (3,70m)

Tamba

AbidjanAccra

Malabo

Toliara

OuagaAmTiman

Dire

Bouar

Atar

Nouadhibou

NCK

Ouesso

Pointe Noire

Casablanca

Las Palmas

Conakry

Lom

e

J OHANESBURG

Station Hors ASECNA

Moroni

Garoua

Liaison FASTCOM VHF déportée

Ser

vice

Fix

eS

ervi

ceM

obile

Dirkou

AgadezGao

Zinder

Faya

Tessalit

Bir-Mogrheim

Sal

RECIFE

St Denis

Alger

Nairobi

Luanda

Liaison en cours de projet

Liaison en cours de projetLiaison en cours de projet

Liaison VHF déportée en projet

Kinshasa

Dar es Salaam

Khartoum

Le Caire

Tripoli

Tunis

Maurice

Sante Maria

INTELSAT 707359°E

86/86 GB/GB Pol B

CAFSATINTELSAT 801

328,5°E 20/20 EH-EH37/37 GB-GB

INTELSAT 903-325,5°E20/20 EH/EH Pol A105/105 SE/SE Pol B

INTELSAT 604SADC 60°E

93/93 SW

Beira

Dzaoudzi

Antsirana

Dakar

FIGURE 2


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FIGURE 3

AFISNET Earth Stations

0

1

2

3

4

5

6

7

8

9

States Members

Nu

mb

er

of

ear

th s

tati

on

s

Standard F1

Standard F2

Standard B


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INTER-REGIONAL CO-OPERATION

•According to APIRG/13 Conclusion 13/14, the interconnection between AFISNET and SADC network is implemented(figure 4). •Other interoperability projects in progress, notably with MEDSAT network (figure 5), will permit to extend AFISNET in the Mediterranean •It should also be noted the realization of a gateway between AFISNET and CAFSAT network (Figure 6)


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AFISNET/SADC NETWORKINTERCONNECTION

HESSADC

Marathon20KMux

SATCOMASECNA

IDU AFTNSwitch

SATCOMASECNA

IDU

Marathon29KMuxAFTN

Switch

ANTANANARIVO CENTER

BRAZAVILLE CENTER

JOHANNESBURG CENTER

SADC NETWORK

Dar es Salaam

Beira

Intelsat 707@3590 ETransponder86/86 GB/GB

Intelsat 604@600 ETransponder93/93 SW_Zone

SATCOMASECNA

IDU

Marathon29KMuxAFTN

Switch

ATS/DS

ATS/DS

ATS/DSSwitch

RS232Async

RS232Async

RS232Async

VSAT HUB

SATCOMASECNA

IDUBackhualcircuit

HartebeestpoortEarth Station

FIGURE 4:


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FIGURE 5

13


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GATEWAY AFISNET/CAFSAT NETWORK

AFTN INTEROPERABILITY

DAKAR

Intelsat 601@ 325.5° ETransponder105/105 ZSE

Intelsat 801@ 328.5° ETransponder20/20 EH-EH38/38 GA-GA

RESEAUAFISNET

RESEAUCAFSAT

AFTNSWITCH

FIGURE 6


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•Consolidation of ATS services on a single satellite:According to APIRG/13 Conclusion 13/11; all the AFI VSAT networks will migrate to the same INTELSAT satellite IS 10-02@359° East.In the short terms, using of the single transponder , will create a seamless network .Anyway, the target is the full interoperability of all the existing AFI VSAT networks(AFISNET, SADC, CAFSAT) and those in progress(NAFISAT and MIDVSAT), by using the same satellite access , the same operating mode and the plug to plug compatible protocols.In so doing, it will permit, notably:

a smooth implementation of the ATN in AFI Region and above all, the implementation of air/ground link by a cooperative and proactive approach. ASECNA will propose possible solutions, for review.


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the portability of applications and in particular the implementation of the links to Hönefoss(ESTB centre in Norway) for the extension of the Test Bed EGNOS trials in Zone B and C .

It should be noted that ASECNA for the purpose of the Test Bed EGNOS trials in its area of competence(zone A), has successfully implemented the link to Hönefoss(ESTB in Norway) using AFISNET, as illustrated in figure 7.

The ICAO regional meeting dealing with the review of migration issues with INTELSAT, will be held in Johannesburg(31 March- 01 April 2004).


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CPU CPU

ThalesRouter Thales Router

Honefoss

INTELSAT

GPS

INMARSAT

AFISNETTOULOUSE HONEFOSS

(NORVEGE)

Ranging + GES ESTB CPF

ESTB Wide area network

VSATASECNA

N'Djamena

BrazzavilleDouala

Lomé

RIMS

GPS signals

RIMS data to/from CPF

EGNOS navigation message(integrity and corrections)

ASECNA AREA

RIMS

RIMSRIMS

FIGURE 7


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AFISNET:INSTRUMENTSUPPORTING

AIR NAVIGATION SERVICES

Support for the ATS services implementation, AFISNET allowed to eliminate most of the shortcomings and deficiencies as regards communications, which prevailed in AFI Region

• AERONAUTICAL FIXED SERVICEAccording to AFI/7 Recommendations 9/2, 9/8, 14/20, APIRG/12 Conclusions 12/12, 12/13, 12/15 and APIRG/13 Conclusion 13/17; the services implemented are summarized below.

AFTN 92 circuitsGTS 30 circuitsATS/DS 88 circuitsMaintenance phone: 100 circuits


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•AERONAUTICAL MOBILE SERVICE

An important programme of the extension of VHF coverage is carried out within the concerned FIR as indicated in table 2.The details of this important VHF programme in ASECNA area , are given in table 3.

It should be noted that, other remote VHF stations will be operational before end of 2004, in particular the remote VHF station in Santiago(Cape Verde), for the VHF coverage extension of the Dakar Oceanic FIR


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FIR REMOTE VHFSTATONS

ANTANANARIVO 3

BRAZZAVILLE 2

DAKAR 4

KANO 4

LAGOS 3

MAURICE 3

NIAMEY 4

N’DJAMENA 5

TOTAL 28

TABLE 2


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FIR REMOTE STATION

COORDINATES VHF FREQUENCY

COVERED AREA

COVERED ROUTES

IN SERVICE

DAKAR

CONTINENTALBIR MOGRHEIN

25° 13’ N

11° 36’ W 129.5

North UR 975,UM 372

UR 977,UA 854

UG 852

2002

ATAR

20° 31’ N

13° 03’ W 129.5

Centre UR 975,UB 728

UA 854,UM 725

UG 861,UG 851

UR 620,UB 601

2002

TAMBACOUNDA

13° 44’ N

13° 39’ W 129.5 South-East

UA 601,UR 979

UB 600,UM 974

UR 620,UR 865

UB 728,UM 372

1996

NOUADHIBOU 20° 56’ N

17° 02’ W

129.5

North-West

UB 601,UB 610

UG 583,UA 600 2003

TABLE 3


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FIR REMOTE STATION


COVERED AREA

COVERED ROUTES

IN SERVICE

NIAMEYTESSALIT

20° 16’ N

01° 00’ E 126.1

North- West UM 104 / UA 614

UB 727,UG 859

UM 608,UB 726

UM 114

2001

GAO

20° 16’ N

01° 00’ E

126.1 West UB 727

UM 104 / UA 614

UA 612,UG 859

UA 603,UR 981

UM 974,UA 600F

UM 608,UB 728

UR 866,UG 855

2001

ZINDER

13° 50’ N

09° 00’ E 126.1 South-East

UR 778,UG 854

UG 858,UR 986

UA 604,UA 615

UB 731

2001

AGADEZ

17° 00’ N

08° 04’ E

126.1

East

UA 615

UA 604

UR 978

UB 731

UR 986

UG 858

2001


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FIR REMOTE STATION


COVERED AREA

COVERED ROUTES

IN SERVICE

NDJAMENA Dirkou 19° 10’ N

12° 54’ E 120.5

North-West UG 727 / UM 731

UA 607,UB 730

UG 858,UR 778

UA 403,UG 862

2001

DIRE

15° 50’ N

14° 49’ E 120.5

West UG 862, UA 403

UM 731 / UA 607

UR 778,UG 727

UM 998 / UA 605

1997

GAROUA

09° 19’ 50’’ N

13° 22’ 28’’ E 120.5 South-West

UW 400,UG 857

UB 736,UH 455G

UM 998 / UG 727

UW 605

2001

FAYA LARGEAU

17° 56’ N

19° 07’ E

128.1

North-East

UG 655

UR 778 2001

AMTIMAN11° 02’ 22’’ N

20° 16’ 39’’ E

128.1 East UG 862,UA 620

UW 605,UB 736

UG 655,UG 650 1997


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FIR REMOTE STATION


COVERED AREA

COVERED ROUTES

IN SERVICE

BRAZZAVILLEBOUAR

05° 57’ 10’’N

15°38’ 20’’E 127.1

North UA 400,UA 500

UA 731,UA 463

UA 607,UA 609 1997

OUESSO

15° 50’ N

14° 49’ E 127.1

North UA 731,UA 403

UA 410,UM 998

UA 610,UR 984 2000

ANTANANARIVO

ANTSIRANANA 12° 30’ 31’’ S

49° 11’ 25’’ E

128.9 North

UA 609,UR 780

UA 665,UR 465

UR 775,UR 790

UB 459,UG 661

1998

MAHAJANGA15° 40’ 08’’ S

46° 20’ 56’’ S

128.9

North-West

UA 401

UB 536 1997

TOLIARA 25° 02’ 09’’ S

46° 57’ 22’’ E

128.9 South-West UG 652,UG 653

UA 402,UA 654 1998


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•NON AERONAUTICAL SERVICES

It should be noted that in its area, ASECNA has implemented an Administrative network including:

Phone communications between operational centres and with the bodies of Headquarter in Dakar

Exchange of messages(Aeronautical Intranet)

Distance learning facilities.


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III – CONCLUSION:

The meeting is invited to:

•take note of the above information

•encourage and consolidate the intra/inter regional cooperation in the implementation of quality ATS services

•recommend the use of the available ground facilities, supporting aeronautical telecommunications, to improve the services given to the users

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