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Combination of the Analysis Centers Reprocessed “SINEX” Solutions

Combination of the Analysis Centers Reprocessed “SINEX” Solutions. R émi Ferland Geodetic Survey Division. Contents. Introduction Procedure Network Products Coordinates ERP’s Apparent Geocenter Summary. Introduction. Main Objective:

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Combination of the Analysis Centers Reprocessed “SINEX” Solutions

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  1. IGS08, Miami, June 2-6, 2008 Combination of the Analysis Centers Reprocessed “SINEX” Solutions Rémi Ferland Geodetic Survey Division

  2. IGS08, Miami, June 2-6, 2008 Contents • Introduction • Procedure • Network • Products • Coordinates • ERP’s • Apparent Geocenter • Summary

  3. IGS08, Miami, June 2-6, 2008 Introduction • Main Objective: • Better meet users requirements by providing more consistent products. • Current Contributors (6 ACs / 5 included): • es1 European Space Operations Center, ESA, Germany • gf1 GeoForschungsZentrum, Germany • mi1 Massachusetts Institute of Technology, USA • ng1 National Oceanic and Atmospheric Administration / NGS, USA • pd1 GFZ Potsdam/IPG Dresden, Germany • si1 (not included) Scripps Institution of Oceanography, USA,

  4. IGS08, Miami, June 2-6, 2008 Procedure • Used results of the test period (1042-1060) • Updated as needed • Backward ( 2007 - 1994 ) • Cumulative solution initialized: • Use Modified Wk 1460: • Deweighted (x100) • Removed marginal stations • At the beginning Not “Steady State” • Rejection Criterion at 8 sigmas

  5. IGS08, Miami, June 2-6, 2008 425 Stations Used at least Once Combined Solution (2007)

  6. IGS08, Miami, June 2-6, 2008 ACs Network Usage Overlap

  7. IGS08, Miami, June 2-6, 2008 Weekly Number of Stations Processed

  8. IGS08, Miami, June 2-6, 2008 Weekly Number of Reference Frame Stations Processed

  9. IGS08, Miami, June 2-6, 2008 ACs Coordinates Residuals Avg. & Std. w.r.t. IGS05 N Consistency: N&E ~2-3mm H ~ 8mm Std. (mm) Avg. (mm) E H Scale=3x

  10. IGS08, Miami, June 2-6, 2008 ACs Coordinates Residuals Avg. & Std. w.r.t. IGS Weekly N Consistency: N&E ~1-2mm H ~ 3mm Std. (mm) Avg. (mm) E H

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

  12. IGS08, Miami, June 2-6, 2008 ACs Scale offset

  13. IGS08, Miami, June 2-6, 2008 Combined ApparentGeocenter Position X(mm) Y(mm) Z(mm)

  14. IGS08, Miami, June 2-6, 2008 ACs Apparent Geocenter Residuals and Standard Deviation X Consistency: X&Y ~ 3-4mm H ~ 7mm Std. (mm) Res. (mm) Y Z Excluded: gf1 Scale=2x

  15. IGS08, Miami, June 2-6, 2008 ACs ERPs Average Weekly Residuals w.r.t. the IGS combined Yp Xp LOD Ypr Xpr Consistency: LOD ~ 10us [XY]p ~ 0.02-0.03mas [XY]pr ~ 0.08-0.10mas/d Excluded: pd1 LOD [XY]p, [XY]pr (Under Review)

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

  17. IGS08, Miami, June 2-6, 2008 Summary (1/3) • 5 ACs • Network: • All stations : Weekly ~275; Total ~425 • Reference Frame Stations: 105 – 115 • Some AC Parameters Excluded • ERPs : pd1 • Geocenter : gf1

  18. IGS08, Miami, June 2-6, 2008 Summary (2/3) • ACs Coordinates Consistency w.r.t.: • IGS05 (N-E ~ 2-3 mm, H ~ 8 mm) • IGS Weekly (N-E ~ 1-2 mm, H ~ 3 mm) • IGS Cumulative (N-E ~ 2 mm, H ~ 5 mm) • ACs ERPs Consistency: • LOD ~ 10us • ( [XY]p ~ 0.02-0.03 mas; [XY]pr ~ 0.08-0.10mas/d) • Bull. A & IGS ERPs: • LOD -2 ± 18us • ( Xp&Yp -4&4 ±6 mas; Xpr&Ypr -5&-1 ± 15mas/d) • ACs Geocenter Consistency: • X & Y ~3-4 mm Z ~ 7mm

  19. IGS08, Miami, June 2-6, 2008 Summary (3/3) • Work in progress – some ACs are still missing • ~ One month to recombine one year

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