Recent Development in Time Metrology

  1. French College of Metrology
  1. J. Achkar and
  2. D. Valat

Published Online: 3 FEB 2010

DOI: 10.1002/9780470611371.ch14

Transverse Disciplines in Metrology

Transverse Disciplines in Metrology

How to Cite

French College of Metrology (2009) Recent Development in Time Metrology, in Transverse Disciplines in Metrology, ISTE, London, UK. doi: 10.1002/9780470611371.ch14

Author Information

  1. Observatoire de Paris, LNE-SYRTE 61 avenue de l'Observatoire 75014 Paris, France

Publication History

  1. Published Online: 3 FEB 2010
  2. Published Print: 1 JAN 2009

ISBN Information

Print ISBN: 9781848210486

Online ISBN: 9780470611371



  • acquisition;
  • tropospherical maps;
  • satellite data;
  • automatic detection;
  • satellite simulator


The recent development in time metrology done at LNE-SYRTE, allows the laboratory to improve its measurement uncertainties, especially on i) the determination of the deviation between the coordinated universal time UTC and its national realization UTC(OP), evaluated within ±1.5 ns, ii) the equipment of remote atomic clocks comparison, through microwave links with communications satellites (TWSTFT technique) or radio-navigation satellites (GPS P3 technique) and iii) the frequency accuracy of the French atomic time TA(F) permitting the realization of the SI second at better than ±1.10-14 and making an excellent standard for the laboratories accredited by the COFRAC.