博碩士論文 946203023 詳細資訊


姓名 柯孝聰(Hsiao-Tzung Ko)  查詢紙本館藏   畢業系所 太空科學研究所
論文名稱 福衛三號電離層資料品質控管
(The Quality Control of Formosat-3/COSMIC ionospheric data)
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摘要(中) 本文針對福衛三號2006.07~2007.02電離層電子濃度資料設計一套品質篩選( Quality Control )的流程:首先,利用電子濃度對高度的斜率正負變換,重新定義原始資料中的F2 層的峰值高度( Layer Peak-height )與最大電子密度( Peak-density ),另外,定義兩個參數,其一是420 km與490 km處的電子濃度對高度的斜率( Slope ),另一是140 km以上電子濃度的擾動量( Mean Deviation ),利用物理與統計特性替這兩項參數設定了門檻值:-9 < Slope < -0.02與M.D.< 3,在門檻值之內屬於品質較優的資料;經過F2 Layer Peak-height重新定義與Slope、M.D.的條件篩選後,將其資料與IRI 模式(Model)模擬值、電離層觀測儀( Ionosonde )觀測值作一比較,證實經篩選後的資料遠優於未經篩選的資料;再與IRI模擬值作一差異值的分布比較,差異值多發生在赤道正負20度的區域,且都是IRI模擬值偏高。分別再針對前述定義的Slope與M.D.做日變化與季節變化,可以觀察到Slope的變化情形與F2 Layer Peak-density呈負相關,而M.D.有顯著變化的區域則與電漿泡發生的分布情形類似。
摘要(英) We develop a Quality Control algorithm in this study to screen out bad FORMOSAT-3/COSMIC-retrieved electron density profile collected during the period from July 2006 to February 2007. First of all, we redefine the F2 Layer Peak-height and F2 Layer Peak-density of the raw data. Second, we define two new parameters for the use of the data quality control: one is Slope which is the vertical gradient of the electron density for the height range 420-490 km, the other one is Mean Deviation (M.D.) which is the summation of the relative deviation of the raw electron density from the background electron density profile that is obtained by doing 9-point running average on the original electron density profile above 140 km. According to the statistics analysis, we select thresholds for these two parameters: -9 < Slope < -0.02 and M.D. < 3, namely, the electron density profile with the slope and M.D. are, respectively, within their thresholds is accepted for further analysis. We compare the data between COSMIC measurement and IRI Model and find that the threshold that we define are pertinent and acceptable. With good quality data, we compare COSMIC-measured electron density with IRI model data. We find that the differences in the two are primarily distributed along the geomagnetic equator. We also compare the seasonal and diurnal variations of Slope and M.D.. The result shows that Slope is negatively correlated with F2 Layer Peak-density and the variation of M.D. is distributed in the region where the plasma bubbles are frequently occurred.
關鍵字(中) ★ 中華衛星三號
★ 福爾摩沙三號
★ 福衛三號
關鍵字(英) ★ Formosat-3
★ COSMIC
論文目次 第一章 前言
1.1 研究動機1
1.2 電離層簡介2
第二章 系統簡介與反掩原理
2.1 GPS系統15
2.2福爾摩沙衛星三號系統16
2.3掩星觀測原理19
第三章 品質控管( Quality Control )
3.1 品質控管( Quality Control ) 26
3.2 定義F2 Layer Peak-height 27
3.3 定義斜率( Slope ) 38
3.4 定義擾動量( Mean Deviation ) 45
3.5 品質控管( Quality Control )流程 53
3.6 品質控管( Quality Control )品質比對 55
第四章 品質控管條件的特性
4.1 斜率( Slope ) 71
4.2 擾動量( Mean Deviation ) 80
第五章 結論與未來展望86
5.1 結論 86
5.2 未來展望 88
參考文獻89
附錄一 NetCDF簡介91
附錄二 NetCDF檔案格式介紹92
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指導教授 朱延祥(Yen-Hsyang Chu) 審核日期 2007-7-7
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