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 and 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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IN2007-170 |
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) |
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Keyword(1) |
frequency Dissemination |
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the Internet |
Keyword(3) |
short term statistics |
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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 |
6 |
Date of Issue |
2008-02-28 (IN) |
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