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R. Ferland Geodetic Survey Division Geomatics Canada

International GPS Service (IGS) Contribution to the International Terrestrial Reference Frame (ITRF). R. Ferland Geodetic Survey Division Geomatics Canada. Outline. IGS Participation to ITRF IGS Realization and Dissemination of ITRF Network Analysis Products

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R. Ferland Geodetic Survey Division Geomatics Canada

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  1. International GPS Service (IGS) Contribution to theInternational Terrestrial Reference Frame (ITRF) R. Ferland Geodetic Survey Division Geomatics Canada

  2. Outline • IGS Participation to ITRF • IGS Realization and Dissemination of ITRF • Network • Analysis • Products • Station Coordinates & Velocity • ERP’s • Geocenter • Final Remarks

  3. VLBI LLR GRIM GIUB GSFC SHA FSG EUR GFZ DGFI CODE SLR CSR IGN1 JPL1 IGN2 ITRF2000 AUS CGS CRL NCL JPL2 REGA NOAA DEOS DGFI JCET DORIS Multi-Techniques GRGS IGN GPS Contributions in ITRF2000 GLOBAL IGS Densification

  4. cod cod cod cod cod emr emr emr emr emr esa esa esa esa esa gfz gfz gfz gfz gfz jpl jpl jpl jpl jpl ngs ngs ngs ngs ngs sio sio sio sio sio JPL JPL IGSnow JPL JPL JPL mit mit mit mit mit ncl ncl ncl ncl ncl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . igs igs igs igs igs . . . . . . . . . . . . . . . . . . . . . Weekly/Cumulative Combination Global Network Associate Analysis Centers (GNAAC) Analysis Centers GPS Wk. 0837 ….. ….. ….. now +1900 solutions +800 solutions Cumulative All Available Covariance Information is Used.

  5. All IGS Stations Used Since 1996

  6. IGS Stations Contribution to ITRF

  7. STD in mm&mm/y of the Residuals Between ITRF2000 and IGS Solution

  8. Realization ITRF2000 IGS Subset Products - Stations: - Coordinates - Accumulated Coor./Vel. - Daily ERP’s - Apparent Geocenter - Transformation Parameters ITRF Subset IGS Realization and Dissemination of ITRF Weekly Analysis - IGS Subset aligned to ITRF Subset to ensures maximum Internal consistency and stability of the products. Used during the Orbit Combination process performed at CODE, to ensure consistency between the products.

  9. Stations Included in the IGS Realization of ITRF97

  10. Stations Included in the Proposed Realization of ITRF2000

  11. Smoothed Weighted RMS of IGS Final Orbits * * http://www.aiub.unibe.ch/acc.html

  12. Final Remarks • Cumulative solution: • over 5 years of data • +- 2700 weekly solutions • 270 stations • 167 Stations submitted to ITRF. • Comparison of IGS cumulative and ITRF2000: • Position RMS ( H = 1mm , V = 3mm ) • Velocity RMS ( H = 2mm/y , V = 5mm/y ) • IGS realization of ITRF uses a subset of the IGS cumulative solution to improve internal stability and consistency.

  13. Final Remarks (Cont.) • Redundancy and Robustness in the Analysis. • Station and Satellite Position Statistics show similar improvement trends. • Contribution (see: http://igscb.jpl.nasa.gov/): • All Agencies responsible for the installation and maintenance of the tracking stations. • Data Centers • Global (gsfc, sio, ign) Regional ( …..) • Analysis: • AC (cod, emr, esa, gfz, jpl, ngs, sio) • GNAAC ( jpl, mit, ncl) • …….

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