1 / 20

Reference Frame Working Group Report

This report summarizes key findings from the IGS08 meeting held in Miami from June 2-6, 2008. It discusses the status of the IGS05 reference frame realization, detailing the performance and availability of geodetic stations, including the evolution of IGS station processing, network contributions, and consistency measures for coordinates and Earth rotation parameters (ERPs). It highlights the challenges faced by stations, such as discontinuities and inactivity, while providing insights into apparent geocenter stability and coordinate residuals.

hallam
Télécharger la présentation

Reference Frame Working Group Report

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related