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Sigfrido LeschiuttaCCTF Chairman

CCTF CONSULTATIVE COMMITTEE FOR TIME AND FREQUENCY

REPORT FOR THEXXII CONFÉRENCE GÉNÉRALE

DES POIDS ET MESURESParis, 8-13 October 2003

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XXII CGPMCCTF REPORT

• the second frequency standards

• the hour time scales

• global clock comparisons how compare the clocks of the NMI’s

• clocks and frequency standards uses in Science and Technology

• joint activity CCL-CCTF toward future secondary optical definition of the second

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the best atomic clocks

caesium fountains

4

5

6

SYRTE-FO2

FRANCE

7

NIST-F1USA

8

PTB-CSF1

GERMANY

9

IEN-CSF1 ITALY

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38 countries participating into TAI:

Poland Israel ThailandAustralia Portugal SpainAustria Norway Hong-KongChina Lithuania U.K.Switzerland Japan SwedenMexico Romania SlovakiaGermany USA IndiaItaly Bulgaria CanadaArgentina Singapore Russian FederationCzeck Republic Korea, Rep. of Chinese TaipeiTurkey South Africa New ZealandFrance The Netherlands BelgiumBrazil Chile

53 laboratories participating into TAI

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XXII CGPMCCTF REPORT

• clocks and frequency standards uses in Science and Technology• fundamental research and fundamental constants

• metrological applications, outside time

• telecommunications

• satellite navigation systems

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XXII CGPMCCTF REPORT

ATOMIC CLOKSFOR SATELLITE NAVIGATION SYSTEMS

BEFORE 2003 AFTER 2005

GPS GLONASS WAAS EGNOS GALILEO

Space 90 90 0 0 90

Earth 20 - 25 15 - 20 80 10 - 20 35-40

Total 115 110 80 10 - 20 120 - 130Grand total - about 450

all the figures are estimates