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IGS Overview. Ruth Neilan IGS Central Bureau at JPL Pasadena, California USA. Content. Mission & History Organization of the IGS Key Components Working Groups Pilot Projects Applications Resources, IGS CB Information System. In Support of Science. - PowerPoint PPT Presentation

Text of IGS Overview

  • IGS OverviewRuth Neilan

    IGS Central Bureau at JPLPasadena, CaliforniaUSA

  • ContentMission & HistoryOrganization of the IGSKey ComponentsWorking GroupsPilot ProjectsApplicationsResources, IGS CB Information System

  • In Support of ScienceThe accuracies of the IGS data and products are to be sufficient to support scientific requirementsAccess to and continued improvement of the ITRF (International Terrestrial Reference Frame)Station position and velocitiesMonitoring Earth rotation parametersMonitoring deformation of the solid Earth and hydrosphere variationsPrecise time transferScientific satellite orbit determination, LEOs Ionospheric monitoring and researchAtmospheric applications - ground and space based for climate research, eventually weather forecasting

  • Historical PerspectiveKey factors in formation of IGS All geodynamics and geodetic organizations realized the potential of GPS by early 90sMotivating goal: Millimeter positioning in support of science anywhere in the worldNot one agency can nor should assume the capital investment & recurring operations costs for the entire infrastructureJoin with key international partners to form federation, define cooperation, set standards, science quality drivenIGS History documented in Annual Report Series (1994)

  • Organization of the International GPS Service

  • NAVSTAR GPS SatellitesGPS StationsTelephone - Modem, Radio LinksINTERNET

    SATELLITE LINKOperational & Regional Data CentersGlobal Data CentersAnalysis CentersAnalysis Center CoordinatorCentral BureauManagement, Network Coordinator,Central Bureau Information SystemUSERSPractical, Custom, Commercial, Governments,...INTERNATIONAL GOVERNING BOARDRegional Network Associate Analysis CentersGlobal Network Associate Analysis CentersORGANIZATION OF THE INTERNATIONAL GPS SERVICEIGS Projects and Working GroupsReference Frame DensificationPrecise Time TransferLow Earth OrbitersIonosphereAtmosphereSea LevelGLONASS Pilot Service Project

  • Organization of the IGSThe IGS accomplishes its mission through the following components:Network of tracking stationsData CentersAnalysis Centers and Associate Analysis CentersAnalysis Center CoordinatorReference Frame CoordinatorWorking Groups and Pilot ProjectsCentral BureauGoverning Board

  • IGS Extended Network

  • IGS Global Tracking Stations

  • Data Centers of the IGSData Centers have three categories (see IGS Data Center Presentation)Operational Centers have direct contact with the stationsRegional Centers store all data from a geographic region, some for a special applicationGlobal Data Centers (GDC) are the main interface with Analysis Centers and Users, store all data used by Analysis Centers and all IGS productsCrustal Dynamics Data Information SystemInstitut Geographique NationalScripps Institution of Oceanography

  • Analysis Centers of the IGSAnalysis Centers have two categories:Analysis Centers produce daily products on a continuous basisAssociate Analysis Centers produce unique products such as station coordinates and velocities, tropospheric information; ionosphere information; they may facilitate distributed processing, analyze dense regional networks, combine network solutions, etc. Global Network Associate Analysis Centers (GNAAC)Regional Network Associate Analysis Centers (RNAAC)Products and applications of the ACs, see IGS Product presentation.

  • IGS Analysis CentersAnalysis CentersAstronomical Institute University of Bern, Switzerland - CODEEuropean Space Operations Center / European Space Agency, Germany - ESOCFLINN Analysis Center, Jet Propulsion Laboratory, USA- JPLGeoForschungsZentrum, Germany - GFZGeosciences Lab, National Geodetic Survey, USA- NGSNatural Resources Canada, Canada- NRCAN (EMR)Scripps Institution of Oceanography, USA SIOUS Naval Observatory, USA - USNOAnalysis Coordinator: Tim Springer, University of Bern, formerly Jan Kouba, Natural Resources Canada

  • IGS Central BureauThe Central Bureau is responsible for general management of the IGS and acts as the executive arm of the Governing Board. The CB is located at NASAs Jet Propulsion Laboratory.

    The primary functions of the CB are to:Coordinate and manage IGS activitiesIGS Network Coordination responsibilities formalized in 1998Establish and promote compliance to IGS network standardsMonitor network operations and quality assurance of dataDevelop and operate the Central Bureau Information System (CBIS) websiteAct as day-to-day liaison with external agencies worldwide

  • IGS Governing BoardMEMBERINSTITUTION & COUNTRYFUNCTIONSTERM* (current: 4 years)Christoph ReigberGeoForschungsZentrum, GermanyChair, Appointed (IGS)1999-2002Gerhard BeutlerUniversity of Bern, SwitzerlandAppointed (IAG)---Mike BevisUniversity of Hawaii, USAAppointed (IGS)1998-2001Geoff BlewittUniversity of Nevada, RenoAnalysis Center Representative1998-2001Claude BoucherInstitut Geographique National, ITRF FranceIERS Representative ---Carine BruyninxRoyal Observatory, BelgiumIGS Representative to IERS2000-2003John DowEuropean Operations Center, GermanyNetwork Representative2000-2003Bjorn EngenNorwegian Mapping AuthorityNetwork Representative 1998-2001Joachim FeltensEuropean Operations Center, Germany Ionosphere Working Group Chair1999-2000Remi FerlandNatural Resources CanadaIGS Reference Frame Coordinator1999-2000Gerd GendtGeoForschungZentrum Potsdam, GermanyTroposphere Working Group Chair1999-2000Tom HerringMassachusetts Institute of TechnologyIAG Representative---John Manning Australian Survey and Land Information GroupAppointed (IGS)2000-2003Ruth NeilanIGSCB, Jet Propulsion Laboratory, USADirector of Central Bureau---Carey NollGoddard Space Flight Center, USAData Center Representative1998-2001Paul PaquetRoyal Observatory of BelgiumFAGS Representative---Jim RayU.S. Naval Observatory, USAPrecise Time Transfer Project, Chair1999-2000Markus RothacherTechnical University Munich, GermanyAnalysis Representative2000-2003Robert SerafinNatl. Center for Atmospheric Research, USAAppointed (IGS)1998-2001Jim SlaterNatl. Imagery and Mapping Agency USAInternational GLONASS Pilot Project, Chair2000-2002Tim SpringerUniversity of Bern, SwitzerlandAnalysis Center Coordinator1999-2002Michael WatkinsJet Propulsion Laboratory, USALow Earth Orbiter Working Group Chair1999-2000James ZumbergeJet Propulsion Laboratory, USAAnalysis Center Representative2000-2003Angelyn MooreIGSCB, Jet Propulsion Laboratory, USASecretariat---

  • Contributing Organizations & PeopleOver 80 Contributing Organizations 108 Associate Members More than 1200 Corresponding Members See Resource Sheets (Pages 4 7) for details

  • Contributing OrganizationsFOMIFOMI Satellite Geodetic Observatory, Budapest, HungaryGSDGeodetic Survey Division, NRCan, CanadaGFZGeoForschungsZentrum, Potsdam, GermanyGSIGeographical Survey Institute, Tsukuba, JapanGIUAGeophysical Institute, University of Alaska, Fairbanks, AK, USAGRDLGeosciences Research and Development Laboratory, NOAA, Silver Spring, MD, USAGSFCGoddard Space Flight Center / NASA, USAHRAOHartebeesthoek Radio Astronomy Observatory, South AfricaIRISIncorporated Research Institutions for Seismology, USAICCInstitut Cartografic de Catalunya, Barcelona, SpainIGNInstitut Geographique National, Paris, FranceIMVPInstitute for Metrology of Time and Space, GP VNIIFTRI, Mendeleevo, RussiaISASInstitute for Space and Astronautic Science, Sagamihara, JapanISROInstitute for Space Research Observatory, Graz, AustriaIAAInstitute of Applied Astronomy, St. Petersburg , RussiaINASANInstitute of Astronomy, Russian Academy of Sciences, Moscow, RussiaIESASInstitute of Earth Sciences, Academia Sinica, TaiwanIGGA-WUTInstitute of Geodesy & Geodetical Astronomy, Warsaw University of Technology, PolandIGNSInstitute of Geological and Nuclear Sciences, New ZealandIBGEInstituto Brasileiro de Geografia de Estatistica, BrazilINEGIInstituto Nacional de Estadistica Geografia e Informatica, Aguascaliente, MexicoINGEOMINASInstituto Nacional de Invetigaciones Geologico Mineras (INGEOMINAS), Bogota, ColombiaINPEInstituto Nacional de Pesquisas Espaciais, Brazil

    AWIAlfred Wegener Institute, GermanyAIUBAstronomical Institute, University of Bern, SwitzerlandAUSLIGAustralian Survey and Land Information Group, AustraliaBAKOBako Surtanal, IndonesiaBKGBundesamt fuer Kartographie und Geodaesie, GermanyBFLBundesamt fr Landestopographie (Federal Topography), SwitzerlandBIPMBureau International des Poids et Mesures CSRCenter for Space Research, University of Texas at Austin, USACNESCentre National de Etudes, Toulouse, FranceCEECentro de Estudios Espaciales, ChileCICESECentro de Investigacin Cientfica y de Educacin Superior de Ensenada, MexicoCASChinese Academy of Sciences, ChinaKAO-CASChinese Academy of Sciences, Kunming Astonomical Observatory, ChinaCSBChina Seismological BureauCDDISCrustal Dynamics Data Information System, GSFC/NASA, USACMMACSCSIR Centre for Mathematical Modeling and Computer Simulation, Bangalore, IndiaDUTDelft University of Technology, NetherlandsDITTTDepartment of Land, Noumea, New CaledoniaDLR/DFDDeutsche Forschungsanstalt fr Luft-und Raumfahrt e.V., Neustrelitz, GermanyERIEarthquake Research Institute, University of Tokyo, JapanVS NIIFTRIEast-Siberian Research Institute for Physicotechnical and Radiotechnical Measurements, Irkutsk, Russia IVTANElectromagnetic Field Expedition (Bishkek, Kyrgyzstan) of the Institute of High Temperatures, RASESAEuropean Space Agency, GermanyESOCEuropean Space Operations Center, GermanyFGIFinnish Geodetic Institute, Finland

  • Contributing OrganizationsIDAInternational Deployment of Accelerometers / IRIS, Scripps Institution of Oceanography, USAASIItalian Space Agency, Matera, ItalyJPLJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAKAOKorean Astronomy Observatory, Taejon, KoreaKMSKort & Matrikelstyrelsen, National Survey and Cadastre, DenmarkLINZLand Information New Zealand, WellingtonMAOMain Astronomical Observatory of the Ukrainian National Academy, UkraineMOManila Observatory, PhilippinesMITMassachusetts Institute of Technology, Cambridge, MA, USANASANational Aeronautics and Space Administration, USANBSMNational Bureau of Surveying and Mapping, ChinaNCARNational Center for Atmospheric ResearchNGRINational Geophysical Research Institute, Hyderabad, IndiaNIMANational Imagery and Mapping Agency, USAINGMNational Institute in Geosciences, Mining and Chemistry (INGEOMINAS), ColombiaNOAANational Oceanic and Atmospheric Administration, USANSFNational Science Foundation NRCan Natural Resources of Canada, Ottawa, CanadaROBObservatoire Royal de Belgium, Brussels, BelgiumOUATOlsztyn University of Agriculture and Technology, PolandOSOOnsala Space Observatory, SwedenGSCPacific Geoscience Center, Geological Survey of Canada, NRCan, CanadaIERSParis Observatory, International Earth Rotation Service, Paris, FrancePOLProudman Oceanographic Laboratory, UKROAReal Instituto y Observatorio de la Armada, Spain

    RIGResearch Institute of Geodesy, Geodetic Observatory Pecny, Ondrejov, Czech RepublicRGORoyal Greenwich Observatory, UKRJGCRoyal Jordanian Geographic CenterRASRussian Academy of SciencesRDAACRussian Data Archive and Analysis Center, Moscow, RussiaSOESTSchool of Ocean and Earth Science and Technology, University of Hawaii,USA SIOScripps Institution of Oceanography, San Diego, CA, USASAOShanghai Astronomical Observatory, ChinaSCIGNSouthern California Integrated GPS Network, USASRC-PASSpace Research Center of the Astrogeodynamical Observatory, PolandSKStatens Kartverk, Norwegian Mapping Authority, NorwaySOISurvey of IsraelL+TSwiss Federal Office of Topography, SwitzerlandTUMTechnical University MunichUSNOU.S. Naval Observatory, USAUCARUniversity Consortium for Atmospheric ResearchUFPRUniversity Federal de Parana, BrazilUNAVCOUniversity Navstar Consortium, Boulder, CO, USAUBUniversity of Bonn, GermanyCUUniversity of Colorado at Boulder, Boulder, CO, USAUNRUniversity of Nevada, Reno, NV, USANCLUniversity of Newcastle on Tyne, United KingdomUPADUniversity of Padova, ItalyWINGWestern Pacific Integrated Network of GPS, JapanWTUWuhan Technical University, China

  • Operations of the IGSOperational Data Centers Retrieve data from receivers Validate data and monitor station status Translate raw GPS data into RINEX (Receiver Independent Exchange) Forwards appropriate files to Global Data Centers or Regional Data CentersGlobal Data Centers organize the files on the basis of site and time, and provide Internet data access to users and analystsIGS Analysis Centers pick up the data from the Global Data Centers, and estimate precise orbits, Earth Rotation parameters (ERP), clocks, etcAnalysis Center results are collected by the Analysis Coordinator and combined into the official IGS products

  • IGS EvolutionPilot ProjectIAG Approved Service --->


















    Data Access

    3+ day

    3 day


    1 day



    Sub-daily, ultra

    CBIS Access





    25,000 files







  • Estimated Quality of IGS ProductsJune 1999

  • Network DensificationIn 1993 the IGS realized that simultaneous processing of many stations was impracticalIGS groups began investigating the rigorous combination of solutions rather than raw data analysis1994 Workshop on Densification of the International Terrestrial Reference Frame initiatedSINEX - Solution Independent Exchange Format accepted in 1996Combination of global station solutions since late 96Polyhedron Solutions improving (see Annual Report Series)IGS contribution to ITRF significant Establish IGS Reference Frame Coordinator June 99 at Natural Resources of Canada, Remi Ferland

  • Densification ProjectDensified IGS network of ~200 - 250 globally well distributed sites -- goal that any user is within 1500 - 2000 km of a precise reference station Regional analyses produced by Associate Analysis Centers called RNAACs (Regional Network Analysis Center) whoproduce solutions for regional network using IGS products Solutions written into an ascii format call SINEX, Solution Independent Exchange formatRegional solution is made available to Global Network Analysis Centers (GNAACs) whocombine and compare solutions from all regional analysis centersResult is a dense homogeneous network of stations in unique, consistent reference frame (ITRF)

  • IGS/BIPM Precise Time TransferChaired by J. Ray, USNO (USA) & F. Arias, BIPM (France) Study accurate time and frequency comparisonsDevelop operational strategies to exploit GPS measurements for improved accurate time and frequency comparisons worldSignificant to maintaining UTC as new generation of frequency standards emergeNew/upgrade receivers at time labsData analysisKey issue is calibration of instrumental delays to relate GPS clock estimates to external standardsTime transfer comparisons, simultaneously with independent techniques

  • Ionosphere Working GroupChaired by J. Feltens, ESA-ESOC, GermanyWorking group, active through increasing solar maximumCalibration of Radio Signals (GPS and others)Ionosphere Maps Develop combined IGS global ION mapsValidation of maps, may lead to improved IGS ionosphere modelAssessing stochastic behavior of the Ionosphere Supported high rate GPS data acquisition and analysis during August 11, 1999 solar eclipseIONEX is the ascii file exchange format; these files can be accessed at the Global Data Centers

  • LEO (Low Earth Orbiters) Working Group chaired by M. Watkins, JPL, USA Determine role of IGS in future GPS LEO missions, POD +?Oersted,Sunsat, SAC-C, CHAMP, GRACE, GLAS, Support of LEO occultation experiments for atmospheric profilingIGS Network component, obvious infrastructure to support robust, high-rate, low latency data requirementsOther applications require timely availability of data (seconds to hourly)Discussing LEO data as element of IGSAnalyze effects of inclusion in analysis, improve IGS Products?Evaluate potential contribution of ACs to LEO effortUse early missions as case studies and analysis proof of concept

  • Troposphere ProjectChaired by G. Gendt, GFZ, Germany Continuous well distributed measurements of water vapor are of great interest for numerical weather prediction, climate research and atmospheric studiesCollocation of precise meteorological instruments to convert Zenith Path Delay (ZPD) to Percipitable Water Vapor (PWV), need dry delay from barometric pressure, more meteorological instruments neededZenith Path Delay (ZPD) estimated by all IGS AC~100 sites, combined ZPD at 2 hour intervalConsistency of Combination among Acs at 4mm level Comparison to Water Vapor Radiometer (WVR) at Potsdam agree to 1mm of Precipitable Water Vapor (PWV)Official product available at GDCs & CBIS

  • GLONASS Pilot ServiceInternational GLONASS experiment IGEX, Investigated uses of GLONASS for geodetic and geophysical applicationsOctober98 - April99, 61 GLONASS sites, 30 SLR stations Interoperability of GPS/GLONASSPrecise Orbit determination and reference frame: PZ90 - ITRF96/97Time offsets between GPS and GLONASS systems and GLONASS systems to UTCOrbits average throughout ~ 20- 30 cm between ACs1m level comparisons GPS-SLR solutionsDemonstrates the extensibility of IGS to accommodate other microwave systems, e.g. GALILEO, GNSS Pilot Service charter approved by IGSCB, effort led by J. Slater, NIMA USA

  • Sea Level MonitoringGPS for monitoring tide gauge benchmarks (TGBM) and altimeter calibrationDecouple crustal deformation effects at tide gauge benchmarks from true long term sea level trends IGS/PSMSL (Permanent Service for Mean Sea Level) -- Cross discipline, joint activity Currently an seed initiative, not yet a full working group in IGSRecommendations stemming from 1997 workshop, see IGS publicationsTechnical specifications development led by M. Bevis, University of Hawaii, USA, member IGS GB, Chair of IAG Subcommission VIIIRecent list prepared of GPS at TGBM (IGSMail #2501)

  • IGS Web SiteThe Central Bureau Information System is a key resource for all usersOne of the first websites in 1993, originally developed with W. Gurtner , AIUBIGSMail, IGS ReportsIGS Directory, CalendarOn-line PublicationsLinks to IGS sites and other locations of interestRich FTP archivesTracking station information, site logs, network informationFAQ

  • SummaryThe economics of GPS make the measurement technology available to all IGS usersThe organization and outreach of the IGS enables users to take advantage of data, systems, and products developed cooperatively with the top international GPS expertsThrough the IGS standards are developed and adopted worldwide, contributing to robust, homogenous reference frame and implementing common processesIGS is a supporting foundation for nearly all GPS projects and numerous applications

  • ConclusionTutorial development is our approach to promote extended and appropriate use of IGS products Plan to continue developing tutorialMany thanks to those involved in preparing the tutorial Special thanks to Jan Kouba for coordinating this effortIt is the dedicated contribution of many people and organizations that make the IGS so successful!