GPS電波掩星法之研究｜國立中央大學博碩士論文系統

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研究生：	張榮華 Jung-hua Chang
論文名稱：	GPS電波掩星法之研究 Research of GPS Radio Occultation
指導教授：	朱延祥 Yen-Hsyang Chu
口試委員:
學位類別：	碩士 Master
系所名稱：	地球科學學院 - 太空科學研究所 Graduate Institute of Space Science
畢業學年度：	97
語文別：	中文
論文頁數：	72
中文關鍵詞：	全球定位系統、福爾摩沙衛星三號、電離層、反演、掩星
外文關鍵詞：	ionosphere, FORMOSAT-3, COSMIC, GPS, Occultation
相關次數：	點閱：7 下載：0
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本篇論文是使用福爾摩沙衛星三號ionPhs(Level1)的資料進行GPS掩星法的計算，可反演出電離層之電子濃度；其演算方式是參考[Antonio Rius, 1997]論文中所提到的方式，由ionPhs中超額相位和衛星的位置和速度的資料可算出偏折角(bending angle)，再利用Abel transform積分法算出折射指數(index of refractivity)，進而算出電離層之電子濃度(Electron density)。最後，將會比較和討論COSMIC之反演法與[Antonio Rius, 1997]論文中其反演法之差異，再跟福衛三號ionPrf(Level2)之電子濃度做交叉比對，並且討論及誤差之分析。結果與討論之重點會放在模擬的部份，希望可以透過模擬的方式，進一步探討GPS掩星反演法演算之準確性，且可以確認[Antonio Rius, 1997]論文中之反演法和計算過程的誤差值，再分別討論其結果。

The ionospheric electron density profile can be retrieved from total electron content (TEC) by using Abel method, which is measured by LEO satellite from GPS signal. However, the excess phase information of GPS signals received by COSMIC satellites can also used to retrieve electron density profile in accordant with radio occultation technique, in which the bending angle of GPS is calculated and the ionosphere refractive index is converted using the Abel transform that contains electron density information. In this presentation, the electron density profiles obtained by piercing method and bending angle of GPS ray are compared and the discrepancies in the two are discussed.

摘要 …………………………………………………………………………...i
Abstract ...............................................................................................................ii
致謝. ………………………………………………………………………….iii
目錄. …………………………………………………………………………..v
圖目錄. ............................................................................................................. viii
表目錄. .................................................................................................................x
第一章 前言..................................................................................................... - 1 -
第二章 電離層理論基礎................................................................................ - 3 -
2-1 電離層簡介....................................................................................... - 3 -
2-1-1 電離層之定義........................................................................ - 3 -
2-1-2 電離層之簡史........................................................................ - 4 -
2-2 電離層結構....................................................................................... - 5 -
2-2-1 D 層......................................................................................... - 5 -
2-2-2 E 層......................................................................................... - 6 -
2-2-3 F1 層....................................................................................... - 7 -
2-2-4 F2 層....................................................................................... - 8 -
2-3 查普曼層理論(Chapman Theory) ................................................... - 9 -
2-3-1 查普曼層理論基礎................................................................ - 9 -
2-3-2 查普曼層的應用.................................................................. - 13 -
2-4 衛星觀測系統簡介......................................................................... - 16 -
2-4-1 福爾摩沙衛星三號星系系統簡介...................................... - 16 -
2-4-2 福爾摩沙衛星三號觀測任務.............................................. - 18 -
2-4-3 GPS 全球定位系統簡介....................................................... - 19 -
第三章 GPS Radio Occultation 演算方法與原理.................................... - 22 -
3-1 偏折角(bending angle) ............................................................... - 23 -
3-1-1 光學路徑和Bouguer’s Law ............................................ - 23 -
3-1-2 都卜勒平移(Extra Doppler Shift) ................................ - 27 -
3-1-3 計算偏折角.......................................................................... - 30 -
3-2 Abel transform-偏折角和折射指數........................................... - 31 -
3-2-1 Abel transform 的推導.................................................... - 31 -
3-2-2 折射指數和電子濃度.......................................................... - 33 -
3-3 Abel transform-全電子含量和電子濃度................................... - 34 -
第四章 資料分析與處理.............................................................................. - 36 -
4-1 資料篩選......................................................................................... - 36 -
4-1-1 超額相位.............................................................................. - 37 -
4-1-2 反掩面和輔助面.................................................................. - 38 -
4-2 座標轉換......................................................................................... - 41 -
4-2-1 ECI 座標............................................................................... - 41 -
4-2-2 Julian day........................................................................... - 42 -
4-3 Abel transform 奇異點和積分................................................... - 46 -
4-3 演算流程......................................................................................... - 49 -
第五章 演算結果與討論.............................................................................. - 52 -
5-1 比對電離層電子濃度之結果......................................................... - 52 -
5-1-1 超額相位.............................................................................. - 53 -
5-1-2 計算偏折角.......................................................................... - 55 -
5-1-3 折射指數與電子濃度.......................................................... - 58 -
5-2 piercing method 反演方法......................................................... - 60 -
5-3 Simulation 討論........................................................................... - 63 -
5-4 結論與未來展望............................................................................. - 67 -
參考文獻........................................................................................................ - 69 -
附錄…………………………………………………………………………- 72 -

                                

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