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Reference Frame Working Group Report

Reference Frame Working Group Report. R émi Ferland Mike Piraszewski Geodetic Survey Division. Contents. Contributors Network Reference Frame Realization Status (IGS05) Weekly solutions (1400 – Now) Products Coordinates ERP’s Apparent Geocenter Summary. Contributors.

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Reference Frame Working Group Report

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  1. AGU, S.F., Dec 10-14, 2007 Reference FrameWorking GroupReport Rémi Ferland Mike Piraszewski Geodetic Survey Division

  2. IGS08, Miami, June 2-6, 2008 Contents • Contributors • Network • Reference Frame Realization Status (IGS05) • Weekly solutions (1400 – Now) • Products • Coordinates • ERP’s • Apparent Geocenter • Summary

  3. IGS08, Miami, June 2-6, 2008 Contributors • Analysis Centers (ACs): • cod Center for Orbit Determination in Europe, AIUB, Switzerland, • emr Natural Resources Canada, Canada, • esa European Space Operations Center, ESA, Germany, • gfz GeoForschungsZentrum, Germany, • jpl Jet Propulsion Laboratory, USA, • MIT Massachusetts Institute of Technology, USA, • ngs National Oceanic and Atmospheric Administration / NGS, USA, • sio Scripps Institution of Oceanography, USA, • grg (new) Groupe de Recherche en Geodesie Spatiale /CNES, France • Global Network Associate Analysis Centers (GNAACs): • mit Massachusetts Institute of Technology, USA, • ncl University of Newcastle-upon-Tyne, U.K.

  4. IGS08, Miami, June 2-6, 2008 IGS05 Reference Frame Realization (132 Stations) Criterions: Geometry Monumentation Collocation Performance Data availability Time series Historical

  5. IGS08, Miami, June 2-6, 2008 Evolution of the Numberof IGS05 Stations Processed

  6. IGS08, Miami, June 2-6, 2008 IGS05 Status • Initially 132 stations (Wk 1400 – 06/11/05) • Recently ~100 stations + ~6 intermittent • Inactive ~26 … Main Causes: • Discontinuities (15) • Equipment (13) • Earthquakes (2) • Dormant (6) • Not operational (3) • IGS05 poor velocity (1) • Poor data (1)

  7. IGS08, Miami, June 2-6, 2008 IGS05 Inactive Stations (26)

  8. IGS08, Miami, June 2-6, 2008 Evolution of the Numberof IGS Stations Processed

  9. IGS08, Miami, June 2-6, 2008 Stations in Recent IGS Weekly Solutions Up to ~350 Stations

  10. IGS08, Miami, June 2-6, 2008 ACs Coordinates ResidualsAvg. & Std. w.r.t. IGS05 N Consistency: N&E ~ 3mm H ~ 9mm Std. (mm) Avg. (mm) E H Scale=3x

  11. IGS08, Miami, June 2-6, 2008 ACs Coordinates ResidualsAvg. & Std. w.r.t. IGS Weekly N Consistency: N&E ~ 1-2mm H ~ 3-4mm Std. (mm) Avg. (mm) E jpl: switch to Absolute Antenna phase center H Scale=3x esa: new software

  12. IGS08, Miami, June 2-6, 2008 ACs Coordinates ResidualsAvg. & Std. w.r.t. IGS Cumulative N Consistency: N&E ~ 2-3mm H ~ 5-7mm Std. (mm) Avg. (mm) E H Scale=3x

  13. IGS08, Miami, June 2-6, 2008 ACs Scale offset esa new software

  14. IGS08, Miami, June 2-6, 2008 ACs ERPs Residualsw.r.t. IGS Combined Xp Yp LOD Xpr Ypr Consistency: LOD ~ 10us [XY]p ~ 0.03-0.05mas [XY]pr ~ 0.10-0.20mas/d Excluded: cod [XY]p, [XY]pr sio [XY]pr

  15. IGS08, Miami, June 2-6, 2008 ERPs Residuals BetweenIGS Combined and Bulletin A Xp Yp LOD Xpr Ypr Bull. A Pole Position Interpolated to mid-day Bull. A Pole Rate estimated from Pole position

  16. IGS08, Miami, June 2-6, 2008 IGS Combined Weekly Apparent Geocenter Y X Offset ~2mm Annual Period X&Y ~4mm Z ~5mm Z Scale=2x

  17. IGS08, Miami, June 2-6, 2008 ACs Apparent Geocenter Residuals and Std. w.r.t. IGS Weekly X Consistency: X&Y ~ 5mm Z ~ 10mm Std. (mm) Res. (mm) Y Excluded: gfz ngs (until wk 1476) Z Scale=2x Scale=2x

  18. IGS08, Miami, June 2-6, 2008 Summary (1/2) • Reference Frame Stations • 106 Active • 15 Discontinuities • 11 dormant + not operational • Network of stations: • 60 – 250 (+) per AC • ~350 stations combined • Some AC Parameters Excluded • ERPs : cod ([XY]p, [XY]pr) ; sio ([XY]p) • Geocenter : gfz, ngs (until wk 1476)

  19. IGS08, Miami, June 2-6, 2008 Summary (2/2) • ACs Coordinates Consistency w.r.t.: • IGS05 (N-E ~ 3 mm, H ~ 9 mm) • IGS Weekly (N-E ~ 1-2 mm, H ~ 3-4 mm) • IGS Cumulative (N-E ~ 2-3 mm, H ~ 5-7 mm) • ACs ERP’s Consistency: • LOD ~ 10us • ( [XY]p ~ 0.03-0.05 mas; [XY]pr ~ 0.10-0.20mas/d) • Bull A. & IGS ERPs: • LOD -1 ± 10 us • Xp&Yp -4&+5 ± 5mas ; Xpr&Ypr -2&0 ± 12mas/d • ACs Geocenter Consistency: • X&Y ~5 mm; Z ~ 10mm • AC’s Residual Time Series have small bias w.r.t. each other.

  20. IGS08, Miami, June 2-6, 2008 Some Issues • Provide warning or separate solutions when changes that can affect the products do occur (Usually done) • When a change in Antenna type occur, logs and ACs databases need to be updated quickly, so proper calibration is applied.

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