EOP GPS yearly files - Product metadata 

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Content

Combined EOP solution (x/y pole, LOD) derived from GPS technique

Since 1995, a combined solution of the various GPS series is performed and is used in our current analyses. All series being given at one-day intervals and for the same date, the procedure of the combination is made by a weighted average of the various series. The weighting reflects the qualities of the series, long-term and short-term stability. Two different approaches are used for that purpose: a pair variance analysis based on the mutual comparisons of the series (Gray and Allan, 1974) and secondly comparisons to other reference series. Both lead approximatively to the same order of magnitude.
The data are stored in yearly files 1993.

Format

ASCII

Format Description

First line: 2X,A3,2X,I2,3X,F7.1,2F9.5,2F10.6
Second line: 19X,2F9.5,2F10.6

Documentation

http://hpiers.obspm.fr/eoppc/eop/eopc02/EOPGPS.GUIDE

Data

First line: Month [MMM], Day [DD], MJD, x ["], y ["], UT-UTC [s], D [s]
Second line: sigma_x ["], sigma_y ["], sigma_UT-UTC [s], sigma_D [s]

Time Intervall

1 day

Frequency

bi-weekly

Created by

IERS Earth Orientation Centre

Published by

IERS Earth Orientation Centre

Reference

Gambis, D, N. Essaifi and E. Eisop and M. Feissel, 1993, Universal time derived from VLBI, SLR and GPS, Proc. of the 1993 IGS workshop of the International Association of Geodesy, pp212-217; also published in IERS technical note 16, Dickey and Feissel (eds), ppIV15-20.

Boucher C, Z. Altamimi, D. Gambis, E.Eisop and M. Feissel, Contribution of the Central Bureau of IERS, 1995 IGS Annual report. JPL Publication, 27.

Gambis D., Essaifi N., Eisop E. and M. Feissel, 1993, Universal time derived from VLBI, SLR and GPS, IERS technical note 16, Dickey and Feissel (eds), ppIV15-20.

Gambis D. , 1996, Multi-technique EOP combinations, proceedings of the 1996 IGS Analysis Center workshop, Silver spring.MD, edited by P. Van Scoy and R.E. Neilan, Pasadena, CA, JPL, JPL Publication 96-23.

Gray, J.E. and Allan, D.W. 1974: A method for estimating the frequency stability of an individual oscillator, Proc 8th Ann. Symp. on Frequency Control}, 2439, 277--287.

Ray J.R., 1996, Measurements of length of day using the Global Positioning System, JGR,101,20141-20149.

Ray J.R., 1997, Proposal for the nomenclature and use of UT1-like measurements derived from satellite observations, personal communication.

Contact

services.iers@obspm.fr

Distribution

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