| 研究生: |
張紫鈴 Chang, Tsu-Ling |
|---|---|
| 論文名稱: |
台灣地區GPS衛星追蹤站1999-2002年位移速度場之分析 Analysis of Velocity Field of GPS Tracking Stations in Taiwan over the Interval 1999-2000 |
| 指導教授: |
尤瑞哲
You, Rey-Jer |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 測量工程學系 Department of Surveying Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 79 |
| 中文關鍵詞: | 速度場 、追蹤站 、變形 、衛星定位系統 |
| 外文關鍵詞: | tracking station, deformation, GPS, Velocity |
| 相關次數: | 點閱:105 下載:2 |
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全球定位系統(GPS)具有高精度,全天候觀測的特性,已廣泛應用於地殼變動之範疇。本文以1999年8月到2002年12月台灣地區衛星追蹤站的資料,與IGS國際衛星追蹤站進行聯測,藉此獲得國內衛星追蹤站在ITRF框架下的坐標值與速度量,以明瞭台灣地區板塊運動的情形。
為了節省在運算上所花費的時間,使資料在處理過程更有效率,本文以GPS解算軟體Bernese v4.2自動化計算程序,進行資料處理與平差計算。在資料計算方面,每日計算皆以關島(GUAM)作為約制進行最小二乘平差計算,再將每日之成果進行合併求解。在實驗過程中,發現僅是精密星曆與衛星追蹤站框架不一致所造成國內追蹤站坐標的偏差最大可達約±4cm,此數量級對於地殼運動而言不可忽視,因此本文亦考慮精密星曆與衛星追蹤站參考框架之一致性。
最後分析結果顯示,在921地震之後陽明山(YMSM)、北港(PKGM)、馬祖(MZUM)三個衛星追蹤站之水平速度場量值介於30~40 mm/yr,鳳林(FLNM)與墾丁(KDNM)兩個衛星追蹤站之水平速度場約為20 mm/yr,TMAM衛星追蹤站之水平速度場約為4 mm/yr。此外,各站在垂直方向均呈現下降的情況除北港、鳳林與馬祖兩個衛星追蹤站在垂直方向的速度場偏大(約20mm/yr以上)以外,其餘各衛星追蹤站皆小於10 mm/yr。
The Global Position System (GPS) has been widely applied to monitor the crustal movements for a long time due to its high precision and independence of meteorological conditions. In the thesis, the data of the GPS tracking stations of Taiwan and the international tracking stations of IGPS over the interval August 1999-December 2002 are combined for the computation and analysis of crustal movement and for the establishment of velocity field of GPS tracking stations of Taiwan.
To improve the efficiency of computation, an automatic process based on BPE of the GPS software Bernese v4.2 has been developed. In the daily data processing, the GPS tracking station GUAM of IGS is constrained with its displacement velocity in the network adjustment using Bernese. Our experiment has shown that the inconsistence of reference frame between ephemeris and coordinates of constrained tracking stations can cause a difference up to about 4cm in coordinate. Therefore, that inconsistence cannot be neglected, and is taken into consideration carefully in the thesis.
The results of our experiment have shown that the horizontal velocity of YMSM, PKGM and MZUM tracking stations after 921 earthquake is about 30 ~ 40 mm/yr, FLNM and KDNM about 20 mm/yr, and TMAM about 4 mm/yr . Moreover, all tracking stations of Taiwan descend gradually. YMSM, KDNM, MZUM and TMAM have the vertical displacement velocity less than 10 mm/yr , while PKGM and FLNM have the larger vertical displacement velocity over 20 mm/yr.
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