Reference Frame Working Group Report

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Presentation transcript:

Reference Frame Working Group Report AGU, S.F., Dec 10-14, 2007 Reference Frame Working Group Report Rémi Ferland Mike Piraszewski Geodetic Survey Division

Contents Contributors Network Products Summary 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

Contributors Analysis Centers (ACs): 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.

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

Evolution of the Number of IGS05 Stations Processed IGS08, Miami, June 2-6, 2008 Evolution of the Number of IGS05 Stations Processed

IGS05 Status Initially 132 stations (Wk 1400 – 06/11/05) 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)

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

Evolution of the Number of IGS Stations Processed IGS08, Miami, June 2-6, 2008

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

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

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

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

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

ACs ERPs Residuals w.r.t. IGS Combined IGS08, Miami, June 2-6, 2008 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

ERPs Residuals Between IGS Combined and Bulletin A IGS08, Miami, June 2-6, 2008 Xp Yp LOD Xpr Ypr Bull. A Pole Position Interpolated to mid-day Bull. A Pole Rate estimated from Pole position LOD (us) Xp .01mas Yp .01.mas Xpr .01mas/d Ypr Avg -1 -4 5 -2 Std 18 4 11 12

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

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

Summary (1/2) Reference Frame Stations Network of stations: IGS08, Miami, June 2-6, 2008 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)

Summary (2/2) ACs Coordinates Consistency w.r.t.: IGS08, Miami, June 2-6, 2008 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.

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.