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    题名: 利用GPS觀測量構建台灣南部地區網格式電離層模型
    A Study on Grid-Based Ionosphere Modeling of Southern Taiwan Region Using GPS Measurements
    作者: 吳相忠
    Wu,Shiang Chung
    贡献者: 林老生
    Lin,Lao Sheng
    吳相忠
    Wu,Shiang Chung
    关键词: 電離層延遲
    全電子含量
    L1/L2差分延遲
    相位水準演算法
    薄殼模型
    電離層穿透點
    網格式演算法
    Ionospheric Delay
    Total Electron Content
    L1/L2 differential delay
    Phase Leveling Algorithm
    Thin-Shell Model
    Ionospheric Pierce Point
    Grid-Based Algorithm
    日期: 2003
    上传时间: 2009-09-19 13:12:08 (UTC+8)
    摘要: 電離層延遲為精密GPS定位及導航的主要誤差來源之一，為了減弱電離層延遲對GPS定位及導航的影響，可以利用雙頻GPS觀測量構建即時的區域電離層模型，以提供即時的電離層延遲誤差改正參數，修正因電離層延遲效應造成的定位及導航誤差。
    本研究以台灣地區雙頻GPS觀測量，採用相位水準技術估算全電子含量（TEC）、修正的單站演算法估計各GPS衛星及接收儀之L1/L2差分延遲及以UNSW網格式演算法構建區域的電離層模型。並進而求得適合台灣南部地區網格式電離層模型之較佳網格大小及探討使用那些內政部衛星追蹤站的觀測資料，便可有效建立台灣地區的電離層模型。
    The ionospheric delay is one of the main sources of error in precise GPS positioning and navigation. The magnitude of the ionospheric delay is related to the Total Electron Content (TEC) along the radio wave path from a GPS satellite to the ground receiver. The TEC is a function of many variables, including long and short term changes in solar ionising flux, magnetic activity, season of the year, time of day, user location and viewing direction. A dual-frequency GPS receiver can eliminate (to the first order) the ionospheric delay through a linear combination of L1 and L2 observables. However, the majority of civilians use low-cost single-frequency GPS receivers that cannot use this option. Consequently, it is beneficial to estimate ionospheric delays over the region of interest, in real-time, in support of single-frequency GPS positioning and navigation applications.

    In order to improve real-time regional ionosphere modelling performance, a grid-based algorithm is proposed. Data from the southern Taiwan region GPS network were used to test the ionosphere modelling algorithms. From the test results described here, it is shown that the performance of real-time regional ionosphere modelling is improved significantly when the proposed algorithm is used.
    參考文獻: 中文部分
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    李振燾，「構建與評估電離層遲延模式以增益GPS高度之精度」，行政院國家科學委員會專題研究計畫成果報告 No.NSC84_2211_E014_002，民國八十四年。
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    蔡和芳，「全球定位系統觀測電離層全電子含量」，碩士論文，國立中央大學太空科學研究所，民國八十四年。
    英文部分
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    描述: 碩士
    國立政治大學
    地政研究所
    89257022
    92
    資料來源: http://thesis.lib.nccu.edu.tw/record/#G0089257022
    数据类型: thesis
    显示于类别:[地政學系] 學位論文

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