AMMA - GPS network
description
Transcript of AMMA - GPS network
![Page 1: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/1.jpg)
AMMA - GPS network
O. Bock Prepared for Leeds meeting, April 2006.
Status of implementation on April 1st 2006
O. Bock, IPSL/SA, France
![Page 2: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/2.jpg)
• GPS science team:– Olivier Bock (IPSL/Service d’Aéronomie, CNRS, Paris, France)
– Marie-Noelle Bouin (IGN/LAREG, Marne-la-Vallée, France)
– Erik Doerflinger (LDL, CNRS, Montpellier, France)
– Philippe Collard (LDL, CNRS, Montpellier, France)
– Frederic Masson (LDL, CNRS, Montpellier, France)
• Support teams: gratefully acknowledged !– France: INSU, IGN, Meteo-France, IRD
– Bénin: mainly IRD - Cotonou
– Niger: mainly IRD - Niamey
– Mali: IRD - Bamako, ASECNA and DNM - Gao and Tombouctou
– Burkina-Faso: IRD - Ouaga, CNRST, EIER,
– Ghana: Met. Service in Tamale and Accra
GPS team and support teams
O. Bock Prepared for Leeds meeting, April 2006.
![Page 3: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/3.jpg)
Summary (1/2)
EOP Gao Niamey Djougou
Installed (temp)
(AMMA)
(replaced)
June 05 (GPS)
Aug 05
Dec 05
June 05 (GPS)
Aug 05
Dec 05
June 05 (GPS)
Aug 05
Equipement GPS + PTU GPS + PTU GPS + PTU
Telecom Inmarsat Inmarsat
Data transfert freq. Daily: Jan 06 - NRT planned Daily: Jan 06 -
Data processing 1 - 2 month latency NRT planned 1 - 2 month latency
Main problems - GPS recv breakdown (Sept 05, Mar 06)
- Inmarsat unreliable
No telecom connexion until April 06
- Power shortage (nearly no data lost)
- Inmarsat unreliable
Forthcoming upgrades - GPS recv to be replaced in April 06
April 06: VSAT connexion and data transfert
- Data transfert in failure since 27 Feb. 06
![Page 4: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/4.jpg)
Summary (2/2)
SOP Tombouctou Ouagadougou Tamale
Installed (SOP) April 06 April 06 April 06
Equipement GPS + PTU GPS + PTU GPS + PTU
Telecom GSM GSM GSM
Data transfert freq. 24 / 12 / 6 / 3 h 24 / 12 / 6 / 3 h 24 / 12 / 6 / 3 h
Data processing NRT NRT NRT
Main problems
Forthcoming upgrades
![Page 5: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/5.jpg)
• EOP– Dec 2004: recce in Bénin (Cotonou, Djougou) and Niger (Niamey),
installation of temp. GPS receiver in Cotonou (until Aug. 2005).
– March 2005: recce in Mali (Bamako, Gao, Tombouctou)
– June 2005: installation of temp. GPS in Djougou, Niamey, Gao
– Aug 2005: installation of AMMA GPS in Djougou, Niamey, Gao (incl. Met sensors Vaisala PTU200 + Inmarsat in Djougou and Gao).
– Dec 2005: replacement of Gao GPS receiver (many failures since 15 Sept. 05) and Niamey GPS receiver.
• SOP– March 2006: recce in Burkina-Faso and Ghana, construction of pillars
– April 2006: installation of AMMA GPS in Ouaga, Tamale, Tombouctou (incl. Met sensor) until end Oct 2006.
History of GPS network implementation
O. Bock Prepared for Leeds meeting, April 2006.
![Page 6: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/6.jpg)
GPS station installed in Djougou, August 2005
Station enclosure
Sat. Link antenna
Solar panel
GPS antenna w. radome
Battery / charger
GPS receiver Sat. Link transmitter
Met sensor (PTU)
Met transceiver
Station enclosure
O. Bock Prepared for Leeds meeting, April 2006.
EOP
![Page 7: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/7.jpg)
GPS station installed in Niamey, August 2005
GPS antenna w. radome
Station enclosureMet sensor
(PTU)
O. Bock Prepared for Leeds meeting, April 2006.
EOP
![Page 8: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/8.jpg)
GPS station installed in Gao, August 2005
GPS antenna w. radome
Building top:
- Sat. Link antenna
Building room:
- GPS receiver
- Met transceiver
O. Bock Prepared for Leeds meeting, April 2006.
EOP
![Page 9: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/9.jpg)
GPS site in Ouagadougou, March 2006
O. Bock Prepared for Leeds meeting, April 2006.
Concrete pillar for GPS antenna
Met enclosure
Ougadougou airport
SOP
![Page 10: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/10.jpg)
GPS site in Tamale, March 2006
Concrete pillar for GPS antenna
O. Bock Prepared for Leeds meeting, April 2006.
Tamale airport
Met enclosure
SOP
![Page 11: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/11.jpg)
GPS site in Tombouctou, March 2005
Tombouctou airport
Met enclosure
Concrete pillar for GPS antenna (built on 30 March 06)
SOP
![Page 12: AMMA - GPS network](https://reader033.fdocuments.in/reader033/viewer/2022061606/5681582e550346895dc5937e/html5/thumbnails/12.jpg)
• Raw AMMA GPS data archive:– Cotonou: 2004/12/03 - 2005/08/22 (Ashtech) with some gaps
– Djougou: 2005/06/04 - 07/20 (Ashtech), 2005/08/24 - 2006/02/27 (Trimble)
– Niamey: 2005/05/29 - 08/26 (Ashtech), 2005/08/26 - 12/17 (Trimble)
– Gao: 2005/06/11 - 08/28 (Ashtech), 08/29 - 09/16, 2005/11/03 - 2006/03/09 (Trimble)
• Data processed:– Standard processing strategy (GPS delay):
• Cotonou: 2005/01/01 - 08/22
• Djougou: 2005/06/04 - 07/20, 08/24 - 09/29
• Niamey: 2005/05/29 - 08/25
• Gao: 2005/06/11 - 08/27, 08/29 - 09/13
– Special processing strategy tests for dry-run period (GPS delay):• All avail. stations: 2005/08/15 - 09/15
– GPS IWV solutions available with Trimble receivers (incl. PTU)
Status on GPS data archiving and processing
O. Bock Prepared for Leeds meeting, April 2006.