IGS10, Newcastle upon Tyne England, 28 June 2 July, 2010 Combination of the reprocessed IGS Analysis Center SINEX solutions

Transcription

1 Combination of the reprocessed IGS Analysis Center SINEX solutions Rémi Ferland Geodetic Survey Division

2 Contents Introduction Contribution Combined Products: Coordinates ERP s Apparent Geocenter Summary Recommandations

3 Introduction IGS10, Newcastle upon Tyne England, 28 June 2 July, 2010 Main Objective: Improve products consistency to better meet users requirements Original SINEX products: AC contribution started in early 1996 (Wk 0837) Combinations: GNAACs (mit & ncl) combination since 1996 Pilot Project ~1999 (Wks ) Official since ~2000 (Wks 1050 Now) Latest SINEX products: Reprocessed: (Wks ) Official (Included for completeness): (Wks )

4 Contributing Agencies co[d1] Center for Orbit Determination in Europe, University of Bern, Switzerland em[r1] Natural Resources, Canada es[a1] European Space Operations Center, ESA, Germany gf[z1] GeoForschungsZentrum, Germany gt1 GeoForschungsZentrum, Germany (Tiga) jp[l1] Jet Propulsion Laboratory, USA mi[t1] Massachusetts Institute of Technology, USA (AC + GNAAC) nc[l1] Newcastle, England (GNAAC) ng[s1] National Oceanic and Atmospheric Administration / NGS, USA pd1 GFZ Potsdam/IPG Dresden, Germany si[o1] Scripps Institution of Oceanography, USA ul1 University of La Rochelle, France (Tiga) 11 ACs + 2 GNAACS

5 Contributed Solutions AC (11) Software (6) Data span # of Stations Comments co[d1] Bernese Excluded d ERPs em[r1] Gipsy es[a1] NAPEOS gf[z1] EPOS Excluded apparent geocenter gt1 EPOS Excluded apparent geocenter jp[ll] Gipsy mi[t1] Gamit ng[s1] Page Excluded pole position ( ) pd1 Bernese Excluded LOD si[o1] Gamit Excluded pole rate ( ) ul1 Gamit Excluded apparent geocenter (no ERPs) GNAAC(2) MIT Comparison only. nc[l1] Comparison only

6 Weekly AC Contributed Solutions 4 ACs Contributed to ACs Contributed to ACs Contributed to ACs Contributed to ACs Contributed the entire period Contribution to ITRF2008 ( ) 492 stations

7 AC Networks (Total # of stations) co[d1] (322) em[r1] (229) es[a1] (418) gf[z1] (299) gt1 (390) jp[l1] (413) mi[t1] (700) ng[s1] (436) pd1 (201) si[o1] (422) ul1 (275) Grand Total 900 +

8 Stations Usage IGS10, by Newcastle the upon Tyne ACs England, 28 June 2 July, 2010 for at least 2 years # ACs (# sta) 9 11 (185) 7 8 (70) 5 6 (81) 3 4 (122) 1 2 (185) Total in IGS08 (241) 84 in IGS08_ core (94)

9 Stations Data Span Years of Data (# sta) (78) (81) (158) (157) (169) Total 643

10 Stations in the IGS Weekly Combination sta./y # of St tations Official Repro1 Official GPS Week

11 Reference Frame Stations in the Weekly Combinations # of St tations To strengthen the Frame Realization for 1994, stations were added: BRMU, FORT, GRAZ, HOLB, KOSG IGS97 IGS00 IGb00 IGS GPS Week

12 ACs Coordinates IGS10, Residuals Newcastle upon Tyne England, 28 June 2 July, 2010 Avg. & Std. w.r.t. IGS05 Annual Signal Amplitude ~1mm N Avg g. (m mm) Best Consistency: N&E ~2.5mm H ~ 7mm E Older=noisier (solns. & IGS05) m) 05 d. (m IGS0 Std H Time series shifted by multiples of 3 mm.

13 ACs Coordinates IGS10, Newcastle Residuals upon Tyne England, 28 June 2 July, 2010 Avg. & Std. w.r.t. IGS Weekly N m) Avg g. (m Best Consistency: N&E ~1mm H ~ 2.5 mm E Older=noisier H Std d. (mm m) tes on AC dominat combinatio No A the Time series shifted by multiples of 3 mm.

14 ACs Coordinates IGS10, Newcastle Residuals upon Tyne England, 28 June 2 July, 2010 Avg. & Std. w.r.t. IGS Cumulative Annual Signal Amplitude ~1mm N Avg g. (mm m) Best Consistency: N&E ~ 1.5mm H ~ 5mm Older=noisier E Again, Older=noisier Std d. (mm m) H Time series shifted by multiples of 3 mm.

15 ACs Scale offset Time series shifted by multiples of 1 ppb.

16 IGS Scale Offset Bias = -0.2ppb Drift ppb/y Annual signal Amplitude = 0.3ppb

17 AC Apparent Geocenter IGS10, Newcastle upon Weekly Tyne England, 28 June 2 July, 2010 Residu uals (mm) mi1 A~5mm ng1 A~7mm si1 A~15mm Residuals and Formal Uncertainty X Best Consistency: X&Y ~1mm Z ~ 3mm Older=noisier Y s Z C Dominates ombination No AC the Co Fo ormal Unc certai inty (m mm) Time series shifted by multiples of 20 mm.

18 Combined Apparent IGS10, Newcastle upon Tyne England, 28 June 2 July, 2010 Geocenter Position w.r.t. IGS05 ~ Wk 1050 ~ 5 mm X Y co[d1] em[r1] es[a1] ACACs gf[z1] gt1 jp[l1] Z mi[t1] ng[s1] pd1 si[o1] ul GPS Week

19 ACs Daily ERPs Residuals IGS10, Newcastle upon Tyne England w.r.t., 28 June 2 July, 2010 the IGS Combined LOD Xp Yp Consistency: LOD ~ 10µs [XY]p ~ 0.03mas03 [XY]pr ~ 0.10mas/d (Older=noisier) Xpr Ypr Time series shifted by multiples of 100µs, 50mas, 100 mas/y

20 Daily ERPs STD IGS10, Newcastle upon Tyne England, 28 June 2 July, 2010 LOD XPO XPOR YPO YPOR em es gf gt jp mi ng pd si Red = Smallest STD Green = Largest STD

21 Pole Position Misclosure at Day Boundary Std X mas Y 0.11 mas

22 Pole Position and Rate Formal luncertainty t

23 Summary (1/2) IGS10, Newcastle upon Tyne England, 28 June 2 July, 2010 Contributors : 11 ACs 2 GNAACs Time span: Reprocessed: Official: No significant ifi discontinuity it observed at the reprocessed/official solutions boundary Network: All contribution : stations With 2 years + : 643 stations

24 Summary (2/2) ACs products best consistency: Coordinates w.r.t.: IGS05 IGS Weekly IGS Cumulative ERPs: (N-E ~ 2.5 mm, H ~ 7 mm) (N-E ~ 1 mm, H ~ 2.5 mm) (N-E ~ 2 mm, H ~ 5 mm) LOD ~ 10us ( [XY]p ~ 0.03 mas; [XY]pr ~ 0.10mas/d) Geocenter: X & Y ~1 mm Z ~ 3mm Older (pre-1996) solutions consistency substantially worse

25 Recommendations Improve older combinations (pre-1996) All Acs should contribute (Half have done it) More stations if possible. All ACs should contribute all parameters All contributed Parameters should be unconstrained or at least unconstrainable.

26 Acknowledgements Co[d1] Center for Orbit Determination in Europe, University of Bern, Switzerland Em[r1] Natural Resources, Canada Es[a1] European Space Operations Center, ESA, Germany gf[z1] GeoForschungsZentrum, Germany gt1 GeoForschungsZentrum, Germany (Tiga) jp[l1] Jet Propulsion Laboratory, USA mi[t1] Massachusetts Institute of Technology, USA (AC + GNAAC) nc[l1] Newcastle, England (GNAAC) ng[s1] National Oceanic and Atmospheric Administration / NGS, USA pd1 GFZ Potsdam/IPG Dresden, Germany si[o1] Scripps Institution of Oceanography, USA ul1 University of La Rochelle, France (Tiga) All Data/Products Centers All Agencies and people that contributed station data.