| Presentation | 2005-03-10 A Study on Amplitude Fluctuation of Interference Waves caused by Sporadic-E Propagation in the Lower VHF Band for Television Akiko YAMASATO, Naohiko IAI, Hiroyuki HAMAZUMI, Kazuhiko SHIBUYA, Yasuhiro ITO, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In the lower VHF band in Japanese TV broadcasting (ch. 1-3), radio waves from nearby countries reflect to ionospheric layer that is called to "Sporadic-E" and cause interference to the TV reception. "Sporadic-E" occurs suddenly depending on the season. This Sporadic-E propagation fluctuate dramatically over time, so when investigating technologies to avoid this interference, it is essential to have a grasp of the scope of interference wave level fluctuations, as well as the speed of these fluctuations. We used data measured in Mobara City, Chiba Prefecture, and on the rooftop of the NHK Science & Technical Research Laboratories, when interference was severe, to analyze the scope and speed of these interference wave level fluctuations based on statistical methods. As a result of this analysis, we found that the amplitude distribution of interference waves could be approximated using log-normal distribution, and that the fluctuation component of interference waves is a comparatively gradual fluctuation at around 2Hz or less. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Sporadic-E Layer / Spectrum / Normal Distribution / Amplitude Fluctuation / Statistical Method |
| Paper # | EMCJ2004-149 |
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| Conference Information | |
| Committee | EMCJ |
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| Conference Date | 2005/3/3(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Electromagnetic Compatibility (EMCJ) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Study on Amplitude Fluctuation of Interference Waves caused by Sporadic-E Propagation in the Lower VHF Band for Television |
| Sub Title (in English) | |
| Keyword(1) | Sporadic-E Layer |
| Keyword(2) | Spectrum |
| Keyword(3) | Normal Distribution |
| Keyword(4) | Amplitude Fluctuation |
| Keyword(5) | Statistical Method |
| 1st Author's Name | Akiko YAMASATO |
| 1st Author's Affiliation | The Science & Technical Research Laboratories of NHK() |
| 2nd Author's Name | Naohiko IAI |
| 2nd Author's Affiliation | The Science & Technical Research Laboratories of NHK |
| 3rd Author's Name | Hiroyuki HAMAZUMI |
| 3rd Author's Affiliation | The Science & Technical Research Laboratories of NHK |
| 4th Author's Name | Kazuhiko SHIBUYA |
| 4th Author's Affiliation | The Science & Technical Research Laboratories of NHK |
| 5th Author's Name | Yasuhiro ITO |
| 5th Author's Affiliation | The Science & Technical Research Laboratories of NHK |
| Date | 2005-03-10 |
| Paper # | EMCJ2004-149 |
| Volume (vol) | vol.104 |
| Number (no) | 705 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |