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Student Number 946203023
Author Hsiao-Tzung Ko(柯孝聰)
Author's Email Address stevetyda@gmaul.com
Statistics This thesis had been viewed 1437 times. Download 719 times.
Department Graduate Institute of Space Science
Year 2006
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The Quality Control of Formosat-3/COSMIC ionospheric data
Date of Defense 2007-06-08
Page Count 95
Keyword
  • COSMIC
  • Formosat-3
  • Abstract 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.
    Table of Content 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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    Advisor
  • Yen-Hsyang Chu(朱延祥)
  • Files
  • 946203023.pdf
  • approve immediately
    Date of Submission 2007-07-07

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