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A STUDY ON TIME DURATION CHARCTERISTICS OF RAIN ATTENUATION AND DATA TRANSMISSION EFFCIENCY FOR SATELLITE COMMUNICATIONS

Research Project

Project/Area Number 12650403
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 情報通信工学
Research InstitutionOSAKA ELECTRO-COMMUNICATION UNIVERSITY

Principal Investigator

MAEKAWA Yasuyuki  OSAKA-ELECTRO-COMMUNICATION UNIVERSITY, FACULTY OF ENGINERING, PROFESSOR, 工学部, 教授 (30181572)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsSatellite comunications / Rain Attenuation / Ka-band / Ku-band / Time duration characteristics / raindrop size distribution / Rain front / Unavailable time percentage / 衛星通信回線 / 準ミリ波帯 / 交差偏波識別度 / 前線通過速度 / 前線種別 / 降雨の水平スケール / 継続時間率
Research Abstract

The time duration characteristics of rain attenuation of Ka-band satellite radiowave are investigated related to the kinds of rain fronts, using CS-2, CS-3 and N-Star beacon signals (19., 45 GHz, Right-hand circular polarization, Elevation=49.5 deg) received at the Neyagawa earth station for the past 15 years. For the threshold levels less than 4 dB, warm, cold, and occluded fronts five large cumulative time distribution of rain attenuation, while for the threshold values of more than 5 dB, stationary fronts, shower, and typhoon give large distribution. The duration time distribution of rain attenuation becomes large in the order of cold fronts, stationary fronts, and shower-typhoon events for the threshold values of more than 5 dB, stationary fronts, shower, and typhoon give large distribution. The duration time distribution of rain attenuation becomes large in the order of cold fronts, stationary fronts, and shower-typhoon events for the threshold values of 3-10 dB, Rain attenuation … More ratio of Ka-to Ku-band satellite signals is similarly investigated related to the kinds of rain fronts, using BS (11.84 GHz) and N-Star (19.45 GHz) signals, which have been received in our university (Neyagawa, Osaka) for the past 13 years. A comparatively large attenuation ratio was primarily found, when the cold fronts passed over the earth station in Baiu season. In contrast, a comparatively small ratio was primarily obtained, when the earth station was located to the south of the stationary fronts in Akisame season. A small ratio was also found in summertime shower. This difference seems to be caused by a dominant kind of raindrop size distribution in each season. The effects of satellite diversity on Ka-band ranin attenuation were assessed in three propagation paths with the satellite orbital positions are 110, 132, and 150 E, respectively. The attenuation of each path was observed over the four years of 1995-1998 in our university. The up- and/or down-link Ku-band (14/12 GHz) attenuation was converted to the Ka-band down-link (19, 45 GHz) by the frequency attenuation methods, taking into account the kind of raindrop size distribution in each event. As for the attenuation of 20 dB, time percentage of the cumulative distribution is decreased down to about 60% and 40% of the original 0.01% in two-or three-path diversity systems, respectively.. The effects of satellite diversiyt, however, largely depend on the type of rainfall events Less

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Y.Shibagaki, M.D.Yamanaka, S.Shimizu, H.Uyada, A.Watanabe, Y.Maekawa, S.Fukao: "Meso-beta to gamma-scale circulations associated with precipitating clouds near the Baiu front observed by the MU and meteorological radar"J. Meteor. Soc. Japan. Vol.78. 69-91 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Maekawa: "Year-to-year variations in attenuation ratio of Ka-band to Ku-band satellite signals"Proc. of the 2000 International Symposium on Antennas and Propagation. Vol.1. 281-284 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Maekawa: "Rain attenuation characteristics in Ku and Ka band satellite communications related to the kinds of rain fronts"2001 Joint Conference on Satellite Communications (JC-SAT 2001). 109-114 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Shibagaki, M.D.Yamanaka, S.Shimizu, H.Uyada, A.Watanabe, Y.Maekawa, and S.Fukao: "Meso-beta to gamma-scle circulations associated with precipitating clouds near the Baiu front observed by the MU and meteorological radar"J. Meteor. Soc. Japan. Vol.78, no.1. 69-91 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Maekawa: "Year-to Year variations in attenuation ratio of Ka-band to Ku-band satellite signals"Proc. Of the 2000 International Symposium on Antennas and Propagation (ISAP2000).. Vol.1. 281-284 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Maekawa: "Rain attenuation characteristics"in Ku and Ka band satellite communications related to the kinds of rain fronts. 2001 Joint Conference on Satelite Communications (JC-SAT 2001), Kyoto, Japan Oct.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Shibagaki, M.D.Yamanaka, S.Shimizu, H.Uyada, A.Watanabe, Y.Maekawa, S.Fukao: "Meso-beta to gamma-scale circulations associated with precipitating clouds near the Baiu front observed by the MU and meteorological radar"J. Meteor. Soc. Japan. Vol.78. 69-91 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Maekawa: "Year-to-year variations in attenuation ratio of Ka-band to Ku-band satellite signals"Proc. of the 2000 International Symposium on Antennas and Propagation. Vol.1. 281-284 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Maekawa: "Rain attenuation characteristics in Ku and Ka band satellite communications related to the kinds of rain fronts"2001 Joint Conference on Satellite Communications (JC-SAT 2001). 109-114 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Shibagaki 他: "Meso-β to γ-scale circulations associated with precipitating clouds near the Baiu front observed by the MUand meteorological radars"J.Meteoro.Soc.Japan. 78・1. 69-91 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 前川泰之,白石新: "準ミリ波帯衛星回線の前線種別による降雨減衰継続時間分布特性"電子情報通信学会技術研究報告. A・P200-20. 17-22 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y.Maekawa: "Year-to-year variations in attenuation ratio of Ka-band to Ku-band satellite signals"Proc.of the 2000 International Symposium on Anatennas and Propagation. 1. 281-284 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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