A study on the relationship between time delayed diversity and rain area velocity associated with rain front passage in Ku- and Ka-band satellite communications links

DOI Web Site 8 References

Bibliographic Information

Other Title
  • Ku帯およびKa帯衛星回線における時間遅延ダイバーシティと前線に伴う雨域通過速度の関係(放送用アンテナ・伝搬技術,一般)
  • Ku帯およびKa帯衛星回線における時間遅延ダイバーシティと前線に伴う雨域通過速度の関係
  • Kuタイ オヨビ Kaタイ エイセイ カイセン ニ オケル ジカン チエン ダイバーシティ ト ゼンセン ニ トモナウ ウイキ ツウカ ソクド ノ カンケイ

Search this article

Abstract

The effects of time delayed diversity techniques on Ku- and Ka-band rain attenuation were investigated, using the radio wave signal levels continuously received from Ku- and Ka-band satellites at Osaka Electro-Communication University (OECU) during 1986-2010. In the Ku-band signals, the improvement of unavailable time percentages of larger than 0.01% due to rain attenuation of 5-10dB is found to be decreased by more than one order, as time delayed diversity of about 30-60min is used, while the same amount of improvement is obtained by 10-20min time delay for unavailable time percentages of less than 0.01% due to rain attenuation of greater than 10dB. In the Ka-band signals, however, about 30-60min time delay is also required to obtain similar improvement for rain attenuation of greater than 10dB. The velocity of rain front passage inferred from the weather charts suggests that the effects of time delayed diversity should correspond to those of site diversity recommended by ITU-R, showing, say, 30-min delay equivalent to about 20-km distance associated with rain area motion. The effects of time delayed diversity are shown to be more conspicuous as the velocity of rain area motion is increased, using the long-term statistics of the Ku- and Ka-band satellite signal levels observed for 21 years from 1986 to 2006.

Journal

  • ITE Technical Report

    ITE Technical Report 35.5 (0), 13-18, 2011

    The Institute of Image Information and Television Engineers

References(8)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top