Presentation | 2008-03-06 A Study of Frequency Dissemination over the Internet Akihiko MACHIZAWA, Tsukasa IWAMA, Hiroshi TORIYAMA, |
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Abstract(in Japanese) | (See Japanese page) |
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. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | frequency transfer / the Internet / FTTH / short term statistics / atomic clock |
Paper # | IN2007-170 |
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Conference Information | |
Committee | IN |
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Conference Date | 2008/2/28(1days) |
Place (in Japanese) | (See Japanese page) |
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Paper Information | |
Registration To | Information Networks (IN) |
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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 |