臺灣地區GPS閃爍訊號特性及分析; The analysis of GPS scintillation signal characteristic in Taiwan

NCUIR > College of Earth Sciences > Graduate Institute of Space Science > Department of Earth Sciences > Item 987654321/5249

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5249

Title:	臺灣地區GPS閃爍訊號特性及分析;The analysis of GPS scintillation signal characteristic in Taiwan
Authors:	陳家逸;Chia-yi Chen
Contributors:	太空科學研究所
Keywords:	飄移速度;擾動;閃爍;全球定位系統;drift velocity;irregularity;GPS;scintillation
Date:	2008-05-24
Issue Date:	2009-09-22 09:48:01 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本篇論文研究自台灣上空接受到的GPS衛星訊號，包括L1和L2 頻率訊號，與訊號合成的強度值。我們由L1和L2 頻率訊號計算出全電子含量(TEC , total electron content)，並由訊號合成的強度值計算出閃爍指數(S4, scintillation index)。進一步地資料分析後，將閃爍現象分為三類，(1) 全電子含量與閃爍指數皆發現閃爍現象，(2) 閃爍指數發現閃爍現象但是全電子含量卻出現脫鎖的情況，(3)全電子含量發現電漿泡電漿泡（Plasma Bubble）現象，同時閃爍指數出現擾動。本篇論文中亦對閃爍現象做四種季節的發生統計，找出最常發生的季節；同時對閃爍現象做經緯度的發生統計，得出台灣上空附近那些區域常常出現閃爍現象。經資料處理與分析後，發現在中壢地面接收站與台南地面接收站，觀察到閃爍現象的時間，存在著明顯的時間差異，透過時間差異計算，約略得出由不規則體所產生的閃爍現象其飄移速度。進一步地，使用三種分析方法：(1)向量修正法，(2)虛擬位置修正法，(3)經度修正法，計算出由不規則體所產生的閃爍現象其飄移速度，得出經度修正法最值得信賴。 This paper studies the GPS satellite signals receiving form the neighborhood of Taiwan, including L1, L2 frequency signal, and the amplitude compounded from L1 and L2 signal. We calculate the total electron content (TEC) from L1 and L2, and the scintillation index (S4) from TEC and the signal-amplitude. After data analysis, we separate the scintillation phenomenon into three categories: (1) Both the data observation of TEC and S4 find the phenomenon of scintillation. (2) The data observation of S4 find the scintillation phenomenon while the lose-lock occurs in the data observation of TEC. (3) Both the data observation of TEC and S4 find the phenomenon of scintillation and the occurrence of plasma bubble. We also analyze the scintillation phenomenon by means of seasons. At the same time, we analyze the scintillation phenomenon by means of longitude and latitude. After the data processing and analyzing, we find an obvious time difference of the observation of scintillation phenomenon between Chungli and Tainan station. Taking one step further, we use three analysis method: (1) the method of vector correction, (2) the method of virtual position correction, and (3) the method of longitude correction; we make a calculation of the drift velocity of the scintillation. We find the method of longitude correction most reliable.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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