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Paper Abstract and Keywords
Presentation 2008-03-06 08:20
A Study of Frequency Transfer over the Internet
Akihiko Machizawa, Tsukasa Iwama, Hiroshi Toriyama (NICT) IN2007-170
Abstract (in Japanese) (See Japanese page) 
(in English) Many of Wireless communication systems and distributed measurement and control applications need accurate frequency. Even an atomic clock, often used as a standard frequency oscillator, needs periodic frequency calibration.Because it has frequency drift, called as ageing. We present a new frequency dissemination method using the Internet which can be used inside an building where GPS signal does not reach. Frequency difference shows clock speed. We measures one-way delay to compare two atomic clocks.
The Internet traffic is not stable and the statistics of the one-way delay is not also stable. The presented method use short-time statistics of pseudo-delay which is addition of one-way delay and clock difference.
Representing pseudo-delays are extracted from some short-time period
with small dispersion. To evaluate proposed method, FTTH (Fiber to the home) is used as access line. We can get order of minus 11 accuracy in one-week average.
Keyword (in Japanese) (See Japanese page) 
(in English) frequency Dissemination / the Internet / short term statistics / atomic clock / FTTH / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 525, IN2007-170, pp. 67-72, March 2008.
Paper # IN2007-170 
Date of Issue 2008-02-28 (IN) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee NS IN  
Conference Date 2008-03-06 - 2008-03-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Bankoku Shinryokan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General issues 
Paper Information
Registration To IN 
Conference Code 2008-03-NS-IN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study of Frequency Transfer over the Internet 
Sub Title (in English)  
Keyword(1) frequency Dissemination  
Keyword(2) the Internet  
Keyword(3) short term statistics  
Keyword(4) atomic clock  
Keyword(5) FTTH  
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1st Author's Name Akihiko Machizawa  
1st Author's Affiliation National Institute of Information and Communications Technology (NICT)
2nd Author's Name Tsukasa Iwama  
2nd Author's Affiliation National Institute of Information and Communications Technology (NICT)
3rd Author's Name Hiroshi Toriyama  
3rd Author's Affiliation National Institute of Information and Communications Technology (NICT)
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Speaker Author-1 
Date Time 2008-03-06 08:20:00 
Presentation Time 20 minutes 
Registration for IN 
Paper # IN2007-170 
Volume (vol) vol.107 
Number (no) no.525 
Page pp.67-72 
#Pages
Date of Issue 2008-02-28 (IN) 


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