1 / 17

M. Fritsche, R. Dietrich, A. Rülke Institut für Planetare Geodäsie (IPG),

Reprocessing of a Global GPS Network  Experiences and Results. M. Fritsche, R. Dietrich, A. Rülke Institut für Planetare Geodäsie (IPG), Technische Universität Dresden, Germany. P. Steigenberger Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Germany.

terry
Download Presentation

M. Fritsche, R. Dietrich, A. Rülke Institut für Planetare Geodäsie (IPG),

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. Reprocessing of a Global GPS Network  Experiences and Results M. Fritsche, R. Dietrich, A. Rülke Institut für Planetare Geodäsie (IPG), Technische Universität Dresden, Germany P. Steigenberger Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, Germany M. Rothacher GeoForschungsZentrum Potsdam (GFZ), Germany

  2. Outline • Basic Facts: Database, Software, Resources • Observation Modeling and Adjustment • Results • Conclusions

  3. Basic Facts Project funded DeutscheForschungsGemeinschaft, 2003-2006 Processed period January 1994 – December 2007 GPS data 202 nominal GPS stations Software modiefied Bernese GPS Software Version 5.0 Strategy modified processing scheme adapted from CODE IGS Analysis Center

  4. Basic Facts • Processing on Cluster of Linux PCs • 1-day solution ~ 2.5h from raw level • 1-day solution ~ 15min from screened DD-level • 7-day solution ~ 2h on NEQ level • Labor input invested ~ 15000 man hours • 40% software development and processing setup • 40% data handling and screening • 20% analysis of results and publication • Results • 3 complete processing runs • ~ 20 additional solutions based on 1-day solutions

  5. Bernese GPS Software frozen version from !May 2005! • absolue PCVs (!w.r.t. IGb00!) • 2nd & 3rd –order IONO • IMF for TROPO 1-day Normal Equations (NEQs) ZD-code observations: - ION,DCB,CLK DD-phase observations: - XYZ, TRP - ORB, PCV - ERP Modeling and Adjustment

  6. Modeling and Adjustment Higher-order ionospheric effects mean coordinate residuals for the year 2002 (GRL, Fritsche et al. 2005) compared to standard solution

  7. Modeling and Adjustment A Priori Tropospheric Delay mean NMF-IMFdifferences for 2002 at 5° elevation (GRL, Vey et al. 2006)

  8. 1-day NEQs Modeling and Adjustment 3-day solution satellite orbits weekly solution coordinates, Earth rotation parameter long term solution Reference Frame

  9. Orbit Accuracy SLR residuals for IGS, CODE and Reprocessing GPS orbits (JoG, Steigenberger et al. 2008)

  10. Coordinate Discontinuities Equipment change at Horn Point (HNPT) ASH700936E SNOW rel. PCVs DU= -15.8 mm AOAD/M_TA_NGS NONE abs. PCVs DU= -0.5 mm dDU= 15.3 mm

  11. directly equipment related further equipment changes not reported? Coordinate Discontinuities Altogether 134 discontinuities considered between 1 January 1994 and 31 December 2005

  12. GPS TRF – PDR05 • Terrestrial Reference System Realization • absolute PCVs for satellites and receiver antennas (scale) • preelimination of weekly satellite arcs (CM) • station coordinates, velocities: NNR w.r.t. IGb00 • Xpol, Ypol: freely estimated • spherical harmonics for a surface load redistribution (JGR, Rülke et al. 2008)

  13. GPS TRF – PDR05 Degree-1 Surface Load Coefficients

  14. GPS TRF – PDR05 TRS space geodetic observations + random erros systematic modeling errors additional constaints Comparison of TRFs: instead of 14-parameter transformation weekly 7-parameter transformations TRF = „Estimate“

  15. ITRF2000 ITRF2005 GPS TRF – PDR05 Weekly 7-Parameter Transformations w.r.t. ITRF2000 / ITRF2005

  16. Conclusions • Reprocessing results show improved quality and homogeneity of estimated parameter time series • Reference systemrealization based on homogeneously reprocessed GPS observations • Concept ofsimultaneous estimation of satellite orbits, stationpositions and large-scale surface load deformation in the CM frame

  17. References Rülke A., R. Dietrich, M. Fritsche, M. Rothacher, and P. Steigenberger (2008), Realization of the Terrestrial Reference System by a reprocessed global GPS network, J. Geophys. Res., doi:10.1029/2007JB005231 (accepted) Steigenberger P., M. Rothacher, M. Fritsche, A. Rülke and R. Dietrich (2008), Quality of Reproccessed GPS Satellite Orbits, Journal of Geodesy, doi:10.1007/s00190-008-0228-7 (accepted) Vey S., M. Fritsche, R. Dietrich, M. Rothacher, A. Rülke, P. Steigenberger, (2006), Influence of mapping function parameters on global GPS network analyses – comparison between NMF and IMF, GRL, doi:10.1029/2005GL024361 Steigenberger P., M. Rothacher, R. Dietrich, Fritsche, M., A. Rülke, and S. Vey, (2006), Reprocessing of a global GPS network, JGR, doi:10.1029/2005JB003747 Fritsche M., R. Dietrich, C. Knöfel, M. Rothacher, A. Rülke, S.Vey, P. Steigenberger, (2005), Impact of higher-order ionospheric terms on GPS-estimates; GRL, doi:10.1029/2005GL024342

More Related