Presentation 2008-03-06
A Study of Frequency Dissemination over the Internet
Akihiko MACHIZAWA, Tsukasa IWAMA, Hiroshi TORIYAMA,
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Abstract(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.
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Keyword(in English) frequency transfer / the Internet / FTTH / short term statistics / atomic clock
Paper # IN2007-170
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Committee IN
Conference Date 2008/2/28(1days)
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Registration To Information Networks (IN)
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) A Study of Frequency Dissemination over the Internet
Sub Title (in English)
Keyword(1) frequency transfer
Keyword(2) the Internet
Keyword(3) FTTH
Keyword(4) short term statistics
Keyword(5) atomic clock
1st Author's Name Akihiko MACHIZAWA
1st Author's Affiliation National Institute of Information and Communications Technology()
2nd Author's Name Tsukasa IWAMA
2nd Author's Affiliation National Institute of Information and Communications Technology
3rd Author's Name Hiroshi TORIYAMA
3rd Author's Affiliation National Institute of Information and Communications Technology
Date 2008-03-06
Paper # IN2007-170
Volume (vol) vol.107
Number (no) 525
Page pp.pp.-
#Pages 6
Date of Issue