Transcript Nessun titolo diapositiva

CCTF
CONSULTATIVE COMMITTEE
FOR TIME AND FREQUENCY
REPORT FOR THE
XXII CONFÉRENCE GÉNÉRALE
DES POIDS ET MESURES
Paris, 8-13 October 2003
Sigfrido Leschiutta
CCTF Chairman
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XXII CGPM
CCTF 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
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4
ATOMIC FOUNTAINS IN THE WORLD
OPERATIVE FOUNTAINS
Fountain
1.
2.
3.
4.
5.
6.
7.
SYRTE-FO1
(France)
SYRTE-FO2
(France)
SYRTE-FOM
(France)
NIST-F1
(USA)
PTB-CSF1
(Germany)
IEN-CSF1
(Italy)
USNO
(USA)
Accuracy
uB = 1.0 x 10-15
Contribution
to TAI
Yes
Cs
Notes
uB = 0.8 x 10-15
Yes
Double Cs+Rb
uB = 0.8 x 10-15
Yes
uB = 0.7 x 10-15
Yes
Cs, prototype of the space
PHARAO project
Cs
uB = 0.9 x 10-15
Yes
Cs
uB = 1.8 x 10-15
Yes
Cs
No
Cs, used only as high
stable reference
FOUNTAINS IN ADVANCED DEVELOPMENT
1. METAS (Switzerland) , Cs continuous fountain
2. NPL (United Kingdom)
3. NMIJ AIST (Japan)
FOUNTAINS UNDER DEVELOPMENT
4.
5.
6.
7.
8.
Italy (Politecnico of Turin)
Russia
Brazil
China
Korea
5
SYRTE-FO2
FRANCE
6
NIST-F1
USA
7
PTB-CSF1
GERMANY
8
IEN-CSF1
ITALY
9
38 countries participating into TAI:
Poland
Australia
Austria
China
Switzerland
Mexico
Germany
Italy
Argentina
Czeck Republic
Turkey
France
Brazil
Israel
Portugal
Norway
Lithuania
Japan
Romania
USA
Bulgaria
Singapore
Korea, Rep. of
South Africa
The Netherlands
Chile
Thailand
Spain
Hong-Kong
U.K.
Sweden
Slovakia
India
Canada
Russian Federation
Chinese Taipei
New Zealand
Belgium
53 laboratories participating into TAI
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XXII CGPM
CCTF 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 CGPM
CCTF REPORT
ATOMIC CLOKS
FOR SATELLITE NAVIGATION SYSTEMS
BEFORE 2003
GPS
Space
Earth
Total
GLONASS
AFTER 2005
WAAS
EGNOS
GALILEO
90
90
0
0
90
20 - 25 15 - 20
80
10 - 20
35-40
115
110
80
10 - 20 120 - 130
Grand total - about 450
all the figures are estimates
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