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Practical relativistic clock synchronization for high-accuracy space astrometry

Published online by Cambridge University Press:  06 January 2010

Christophe Le Poncin-Lafitte
Christophe Le Poncin-Lafitte*
Affiliation:
Observatoire de Paris, SYRTE CNRS/UMR8630, Université Pierre et Marie Curie, 77 Avenue Denfert Rochereau, F75014 Paris, France email: [email protected]
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Abstract

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Future high-accuracy space astrometry missions, such as Gaia and SIM, will need a time-tagging of observations consistent with General Relativity nowadays used as standard background for global data processing scheme. In this work, we are focusing on the realization of the onboard time scale. The onboard clock, being not ideal and consequently tainted with systematic biases, has to be carefully calibrated to the ideal relativistic proper time of the satellite. We present here a modeling of this essential step to provide a reliable relation between the onboard time and TCB, a time scale suitable for global data processing.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S261: Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis , April 2009 , pp. 334 - 336
Copyright
Copyright © International Astronomical Union 2010

References

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