AbstractFor the first time, the International DORIS Service (IDS) has produced a technique level combination based on the contributions of seven analysis centers (ACs), including the European Space Operations Center (ESOC), Geodetic Observatory Pecny (GOP), Geoscience Australia (GAU), the NASA Goddard Space Flight Center (GSFC), the Institut Géographique National (IGN), the Institute of Astronomy, Russian Academy of Sciences (INASAN, named as INA), and CNES/CLS (named as LCA). The ACs used five different software packages to process the DORIS data from 1992 to 2008, including NAPEOS (ESA), Bernese (GOP), GEODYN (GAU, GSC), GIPSY/OASIS (INA), and GINS (LCA). The data from seven DORIS satellites, TOPEX/Poseidon, SPOT-2, SPOT-3, SPOT-4, SPOT-5, Envisat and Jason-1 were processed and all the analysis centers produced weekly SINEX files in either variance–covariance or normal equation format. The processing by the analysis centers used the latest GRACE-derived gravity models, forward modelling of atmospheric gravity, updates to the radiation pressure modelling to improve the DORIS geocenter solutions, denser parameterization of empirically determined drag coefficients to improve station and EOP solutions, especially near the solar maximum in 2001–2002, updated troposphere mapping functions, and an ITRF2005-derived station set for orbit determination, DPOD2005. The CATREF software was used to process the weekly AC solutions, and produce three iterations of an IDS global weekly combination. Between the development of the initial solution IDS-1, and the final solution, IDS-3, the ACs improved their analysis strategies and submitted updated solutions to eliminate troposphere-derived biases in the solution scale, to reduce drag-related degradations in station positioning, and to refine the estimation strategy to improve the combination geocenter solution. An analysis of the frequency content of the individual AC geocenter and scale solutions was used as the basis to define the scale and geocenter of the IDS-3 combination. The final IDS-3 combination has an internal position consistency (WRMS) that is 15 to 20mm before 2002 and 8 to 10mm after 2002, when 4 or 5 satellites contribute to the weekly solutions. The final IDS-3 combination includes solutions for 130 DORIS stations on 67 different sites of which 35 have occupations over 16years (1993.0–2009.0). The EOPs from the IDS-3 combination were compared with the IERS 05 C04 time series and the RMS agreement was 0.24mas and 0.35mas for the X and Y components of polar motion. The comparison to ITRF2005 in station position shows an agreement of 6 to 8mm RMS in horizontal and 10.3mm in height. The RMS comparison to ITRF2005 in station velocity is at 1.8mm/year on the East component, to 1.2mm/year in North component and 1.6mm/year in height.


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    Titel :

    IDS contribution to ITRF2008


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 46 , 12 ; 1614-1632


    Erscheinungsdatum :

    2010-05-29


    Format / Umfang :

    19 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    GSFC DORIS contribution to ITRF2008

    Le Bail, K. | Online Contents | 2010


    GSFC DORIS contribution to ITRF2008

    Le Bail, K. / Lemoine, F.G. / Chinn, D.S. | Elsevier | 2010


    Quality Assessment of the IDS Contribution to ITRF2008

    Altamimi, Zuheir / Collilieux, Xavier | Elsevier | 2010


    Analysis of the DORIS contributions to ITRF2008

    Angermann, Detlef / Seitz, Manuela / Drewes, Hermann | Elsevier | 2010


    Discussion contribution

    Bilger, R.W. | Elsevier | 1979