A rigorous approach to simultaneously determine both a terrestrial reference frame (TRF) materialized by station coordinates and Earth Orientation Parameters (EOP) is now currently applied on a routine basis in a coordinated project of the Groupe de Recherches de Geodesie Spatiale (GRGS) To date, various techniques allow the determination of all or a part of the Earth Orientation Parameters: Laser Ranging to the Moon (LLR) and to dedicated artificial satellites (SLR), Very Large Baseline Interferometry on extra-galactic sources (VLBI), Global Positioning System (GPS) and more recently DORIS introduced in the IERS activities in 1995 Observations of the different astro-geodetic techniques are separately processed at different analysis centres using unique software package GINS DYNAMO, developed and maintained at GRGS The datum-free normal equation matrices weekly derived from the analyses of the different techniques are then stacked to derive solutions of station coordinates and Earth Orientation Parameters (EOP) Two approaches are made: the first one consists to accumulate normal equations (NEQs) derived from intra-technique single run solution in a single run combined solution; the second one leads to weekly combinations of NEQs Results are made available at the IERS site (ftp iers1bkgbundde) in the form of SINEX files The strength of the method is the use of a set of identical up-to-date models and standards in unique software for all techniques In addition the solution benefits from mutual constraints brought by the various techniques; in particular UT1 and nutation offsets series derived from VLBI are densified and complemented by respectively LOD and nutation rates estimated by GPS The analyses we have performed over the first four months of the year 2006 are still preliminary; they show that the accuracy and stability of the EOP solution are very sensitive to a number of critical parameters mostly linked to the terrestrial reference frame realization, the way that minimum constraints are applied and the quality of local ties We present thereafter the procedures which were applied, recent analyses and the latest results obtained

Combination of Earth Orientation Parameters and Terrestrial Frame at the observation level

Comments on Xu et al. (2006) Variance component estimation in linear inverse ill-posed models, J Geod 80(1):69–81

The combination method of results of different space geodetic techniques gives two kinds of products. On the one hand, the Earth orientation parameters (EOP) that define the orientation of the Earth in space and, on the other, the coordinates of collocation stations by them the ITRF is realized. Obtained results are based on the method developed by authors, so called “non-rigorous” combination of the data. Approximately eight-year data was successively processed in order to obtain solutions of both products, which were then compared with the results given in ITRF 2005 solution.

/pdf/combination-of-different-space-geodesy-techniques-for-eop-4cz1xhi6le.pdf

Combination of different space geodesy techniques for eop and terrestrial reference frame determination

The IAU Commission 19 meeting during the XXVII IAU General Assembly in Rio de Janeiro was held on Wednesday 5 August 2009, sessions 3 (14:00–15:30) and 4 (16:00–17:30). It was attended by about 40 participants. The meeting was split into three sessions.

/pdf/commission-19-rotation-of-the-earth-1n9h0o725g.pdf

Commission 19: rotation of the earth

We have demonstrated the possibility of deriving both station coordinates and Earth Orientation Parameters (EOP) using weekly normal equations derived from the processing of different space-geodetic techniques: VLBI, SLR, LLR, DORIS and GPS. The work is performed in the frame of a joint project within the GRGS, Groupe de Recherches de Geodesie Spatiale, federation of French institutes. Observations of the different techniques: VLBI, SLR, LLR, DORIS and GPS are processed separately at the different institutes where in addition expertise can be found for the specific technique. Before such products are adopted as references, different problems concerning the stabilization of the terrestrial reference frame have to be solved in addition to upgrading the individual techniques processing to the best possible level of accuracy.

Global combination from space geodetic techniques

Combination of Space Geodesy techniques for monitoring the kinematics of the Earth

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Global combination from space geodetic techniques

Combination of Space Geodesy techniques for monitoring the kinematics of the Earth