English  |  正體中文  |  简体中文  |  Items with full text/Total items : 74010/74010 (100%)
Visitors : 24071156      Online Users : 342
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/64986

    Title: 閃電之定位與誤差模擬:雷達干涉法與時間差法之分析與研究;A comparative study of lightning detection and error analysis between interferometry method and time-of-arrival technique
    Authors: 曾子弋;Tseng,Tzu-i
    Contributors: 太空科學研究所
    Keywords: 閃電;雷達干涉法;時間差法;誤差模擬;lightning;interferometry;time-of-arrival;error distribution
    Date: 2014-07-24
    Issue Date: 2014-10-15 14:37:36 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 民國 101 年,中壢 52MHz 特高頻雷達站增設了一套干涉天線陣列,
    由 5 座八木天線排列成非等間距之十字型,提供干涉定位所需 5 路接收
    利用雷達資料對閃電訊號做統計,電壓崩潰後約0.0262 秒會產生回
    間長度為0.4624 秒;多次電壓崩潰幅射出的電磁波,總發生時間約為
    0.5285 秒;雷達系統定位閃電的極限距離約為20 公里。利用雷達定位出
    有低估的現象。;The new interferometry antenna array composed with the five YAGIs is built at Chung-Li 52MHz VHF radar station in 2012. The antenna array is arranged in the form of an asymmetric cross providing that 5 channels interference received signal. The purpose of this study is to create the method of lightning positioning by interferometry antenna array. And compare the positioning result with Total Lightning Detection System. Interference positioning requires individual path differences between the receiving antennas and targets. We can estimate the spatial position of the target through phase differences due to propagation path difference.
    Using the simulation results of error distribution. To analyze the error of Total Lightning Detection System. By simulation result, we can find out there is a high error area near Chung-Li and Xin-Wu. It can also explain why the statistic number of data difference is large at about 11-12 KM. Also use models to simulation the error distribution for the location where central weather bureau will set lightning detection stations. And compare with Total Lightning Detection System.
    The stroke will happen about 0.0262 second after leader tip breakdown; The lightning signal will exist about 0.4624 second in a flash. The EM pulse radiate by electrical breakdown will exist 0.5285 second in a flash. Radar detection limit is about 20KM.Use radar data to find out Total Lightning Detection System is underestimate on CG.
    Appears in Collections:[太空科學研究所 ] 博碩士論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明