AMMA - GPS network

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AMMA - GPS network. Status of implementation on April 1 st 2006 O. Bock, IPSL/SA, France. O. BockPrepared for Leeds meeting, April 2006. GPS team and support teams. GPS science team : Olivier Bock (IPSL/Service d’Aéronomie, CNRS, Paris, France) - PowerPoint PPT Presentation

Text of AMMA - GPS network

  • AMMA - GPS networkO. BockPrepared for Leeds meeting, April 2006.Status of implementation on April 1st 2006

    O. Bock, IPSL/SA, France

  • GPS team and support teamsGPS science team:Olivier Bock (IPSL/Service dAronomie, CNRS, Paris, France) Marie-Noelle Bouin (IGN/LAREG, Marne-la-Valle, 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, IRDBnin: mainly IRD - CotonouNiger: mainly IRD - NiameyMali: IRD - Bamako, ASECNA and DNM - Gao and TombouctouBurkina-Faso: IRD - Ouaga, CNRST, EIER,Ghana: Met. Service in Tamale and AccraO. BockPrepared for Leeds meeting, April 2006.

  • Summary(1/2)

    EOPGaoNiameyDjougouInstalled (temp) (AMMA) (replaced)June 05 (GPS)Aug 05Dec 05June 05 (GPS)Aug 05Dec 05June 05 (GPS)Aug 05

    EquipementGPS + PTUGPS + PTUGPS + PTUTelecomInmarsatInmarsatData transfert freq.Daily: Jan 06 -NRT plannedDaily: Jan 06 -Data processing1 - 2 month latencyNRT planned1 - 2 month latencyMain problems- GPS recv breakdown (Sept 05, Mar 06)- Inmarsat unreliableNo telecom connexion until April 06- Power shortage (nearly no data lost)- Inmarsat unreliableForthcoming upgrades- GPS recv to be replaced in April 06April 06: VSAT connexion and data transfert- Data transfert in failure since 27 Feb. 06

  • Summary(2/2)

    SOPTombouctouOuagadougouTamaleInstalled (SOP)April 06April 06April 06EquipementGPS + PTUGPS + PTUGPS + PTUTelecomGSMGSMGSMData transfert freq.24 / 12 / 6 / 3 h24 / 12 / 6 / 3 h24 / 12 / 6 / 3 hData processingNRTNRTNRTMain problemsForthcoming upgrades

  • History of GPS network implementationEOPDec 2004: recce in Bnin (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, GaoAug 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.SOPMarch 2006: recce in Burkina-Faso and Ghana, construction of pillarsApril 2006: installation of AMMA GPS in Ouaga, Tamale, Tombouctou (incl. Met sensor) until end Oct 2006.O. BockPrepared for Leeds meeting, April 2006.

  • GPS station installed in Djougou, August 2005Station enclosureSat. Link antennaSolar panelGPS antenna w. radomeBattery / chargerGPS receiverSat. Link transmitterMet sensor (PTU)Met transceiverStation enclosureO. BockPrepared for Leeds meeting, April 2006.EOP

  • GPS station installed in Niamey, August 2005GPS antenna w. radomeStation enclosureMet sensor (PTU)O. BockPrepared for Leeds meeting, April 2006.EOP

  • GPS station installed in Gao, August 2005GPS antenna w. radomeBuilding top:- Sat. Link antennaBuilding room:- GPS receiver- Met transceiverO. BockPrepared for Leeds meeting, April 2006.EOP

  • GPS site in Ouagadougou, March 2006O. BockPrepared for Leeds meeting, April 2006.Concrete pillar for GPS antennaMet enclosureOugadougou airportSOP

  • GPS site in Tamale, March 2006Concrete pillar for GPS antennaO. BockPrepared for Leeds meeting, April 2006.Tamale airportMet enclosureSOP

  • GPS site in Tombouctou, March 2005Tombouctou airportMet enclosureConcrete pillar for GPS antenna (built on 30 March 06)SOP

  • Status on GPS data archiving and processingRaw AMMA GPS data archive:Cotonou: 2004/12/03 - 2005/08/22 (Ashtech) with some gapsDjougou: 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 - 08/22Djougou: 2005/06/04 - 07/20, 08/24 - 09/29Niamey: 2005/05/29 - 08/25Gao: 2005/06/11 - 08/27, 08/29 - 09/13Special processing strategy tests for dry-run period (GPS delay):All avail. stations: 2005/08/15 - 09/15GPS IWV solutions available with Trimble receivers (incl. PTU)O. BockPrepared for Leeds meeting, April 2006.