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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5109


    Title: K波段地面鏈路降雨衰減效應之研究;An Experiment of K Band Terrestrial Propagation Through Rain
    Authors: 李果穎;Kuo-Ying Lee
    Contributors: 太空科學研究所
    Keywords: 地面鏈路;降雨衰減;K波段;Terrestrial Propagation;Rain Attenuation;K Band
    Date: 2001-06-20
    Issue Date: 2009-09-22 09:45:14 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 由於全球化(Globalization)的影響下,無線通訊的重要性與日遽增,也加速了各類型無線通訊技術的蓬勃發展,如微波地面鏈路通訊系統,行動電話、衛星通信。隨著小型區域網路(LAN)及個人通訊系統(PCS)的蓬勃發展,微波地面鏈路通訊系統日趨重要。更由於使用者及傳輸資料量的增加,過去使用的C波段、X波段通訊系統已不敷使用,高頻微波波段的使用應運而生,如K波段(18-27GHz)。 不過由於此一波段在地表大氣通道傳播時,容易受到各項大氣環境因素的影響(如雲、雨滴、冰雹)而產生訊號衰減與去極化等不穩定的現象,因此無線傳輸環境之研究成為重要的課題。其中又以降雨衰減的影響最為顯著。 因此,本論文就是針對降雨衰減效應作一研究,量測及統計在中壢地區的降雨現象對於微波地面鏈路傳輸系統訊號衰減的情形,並嘗試對台灣北、中、南之大都會地區(台北、台中、高雄)的降雨衰減現象作評估。 本研究結果顯示:經過實驗比較之後,ITU(國際電信聯盟) 建議的雨衰預測模式與學者Robert K. Crane所提供的Global模式皆低估了台灣地區雨衰效應之影響。 The increasing demand for wireless broadband service throughout the world has motivated extensive research in high frequency band usages because of the large available bandwidth, high-frequency reuse, and the reduced size of transmitting and receiving antennas and electronic components. At frequency above 10 GHz, the attenuation due to rain becomes significant. In this study, we conducted a research on K band terrestrial propagation system to measure the rain attenuation in Chungli. We also made an estimation of rain attenuation in 3 metropolises in Taiwan (Taipei, Taichung, and Kaoshung). The results show that ITU-R’s rain attenuation prediction model and Robert K. Crane’s Global model both make underestimates of the rain attenuation in Taiwan.
    Appears in Collections:[太空科學研究所 ] 博碩士論文

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