Title page for 986203020


[Back to Results | New Search]

Student Number 986203020
Author Jian-Xiang Ruan(阮建翔)
Author's Email Address No Public.
Statistics This thesis had been viewed 550 times. Download 240 times.
Department Graduate Institute of Space Science
Year 2010
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title A Comparison of Different Radio Occultation Algorithms for ionospheric electron density retrievals
Date of Defense 2011-05-27
Page Count 126
Keyword
  • COSMIC
  • FORMOSAT-3
  • GPS
  • Ionosphere
  • Occultation
  • Abstract  The excess phase provided by the FORMOSAT3/COSMIC was utilized to retrieve the ionospheric electron density from Global Positioning System (GPS) radio occultation (RO) algorithm that is based on Abel transform under the assumption of the spherical symmetry. In this paper, we compared the different radio occultation techniques for the retrieval of ionospheric electron density, in which the bending angle of the GPS ray and calibrated total electron content (TEC) are used, respectively. The retrieved electron densities from different algorithms are validated by electron density measured by ground base ionosonde for three years from 2008 to 2010. We calculated mean deviation (M0) and root mean square error (RMSE) of the foF2 data for different seasons. The results show the RO-retrieved foF2 from bending angle and calibrated TEC are generally consistent with the COSMIC-retrieved foF2. It appears that the electron densities (with M0 between 0.1 and 0.18%) retrieved from the bending angle are better than those (with M0 between 0.25 and 3.2%) from the calibrated TEC in the daytime. However, for the nighttime data, a comparison shows that the electron densities obtained from piercing methods seem to be better than those retrieved from other methods. Nevertheless, the RMSE values for the different RO algorithms seem to be comparable to each other. The details of the different RO algorithms will be introduced in this paper.
    Table of Content 摘要IV
    ABSTRACTV
    致謝VII
    目錄VIII
    圖目錄XI
    表目錄XVI
    第一章 前言1
    第二章 理論基礎3
    2-1 電離層簡介3
    2-2 電離層分層7
    2-3 查普曼理論( CHAPMAN THEORY)13
    2-4 光學路徑和BOUGUER’S LAW23
    2-5 折射指數與電子濃度關係28
    第三章 觀測系統與儀器簡介30
    3-1 全球定位系統(GLOBAL POSITIONING SYSTEM)30
    3-2 福爾摩沙衛星三號系統38
    3-3 電離層探測儀(IONOSONDE)41
    第四章 無線電波掩星(RADIO OCCULTATION) 反演法43
    4-1 偏折角(BENDING ANGLE)44
    4-2 ABEL TRANSFORM50
    4-3全電子含量(TOTAL ELECTRON CONTENT)52
    4-4 奇異點與積分54
    第五章 資料處理58
    5-1 資料篩選58
    5-2 座標轉換63
    5-3正切點(TANGENT POINT)66
    第六章 觀測結果與討論70
    6-1 超額相位70
    6-2 偏折角72
    6-3 電子濃度75
    6-4 統計資料82
    6-5 結論與未來展望103
    參考文獻106
    Reference [1]Antonio Rius, G. Ruffini and A. Romeo, Analysis of Ionospheric Electron Density distribution from GPS/MET occultations. IEEE Transactions on Geoscience and Re note Sensing vol 36 n. 2 ;1998.
    [2]Appleton, E. V. and K. Weekes, On Lunar Tides in the Upper Atmosphere, Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 171, No. 945, pp.171-187;1939.
    [3]Appleton, E. V, Two Anomalies in the Ionosphere, Nature,157, pp. 691;1946.
    [4]Appleton, E. V , A note on the “sluggishness” of the ionosphere, Vol. 3, pp. 282-284;1953.
    [5] Appleton, E. V., A. J. Lyon, and A. G. Pritchard,The detection of the Sq current system in ionospheric radio sounding, J. Atmos. Terr. Phys., Vol. 7, pp. 292-295;1955.
    [6]Appleton, E. V. and A. J. Lyon, Studies of the E layer of the ionosphere I. Some relevant theoretical relationships,J. Atmos. Terr. Phys., Vol. 10, pp. 1-11;1957.
    [7]Appleton, E. V. and A. J. Lyon, Studies of the E-layer of the ionosphere—II : Electromagnetic perturbations and other anomalies, J. Atmos. Terr. Phys., Vol. 21, pp. 73-99;1961.
    [8]Chapman, S., The absorption and dissociative or ionizing effect of monochromatic radiation in an atmosphere on a rotating earth, Proc. Phys. Soc. (London), Vol. 43, pp. 26-45; 1931.
    [9]Chapman, S., The absorption and dissociative or ionizing effect of monochromatic radiation in an atmosphere on a rotating earth II. Grazing incidence, Proc. Phys. Soc.(London), Vol. 43, pp. 483-501;1931.
    [10]David A., and Wayne D. McClain. Fundamentals of Astrodynamics and Applications. Hawthorne, Calif.;2007
    [11]Davies, K., Ionospheric Radio, Peter peregrinus Ltd.(London);1990.
    [12] Fishbach FF, A satellite method for temperature and pressurebelow 24 km. Bull Am Meteorol Soc 9:528–532;1965.
    [13]Fjeldbo, G., A. J. Kliore, and V. L. Eshleman, The neutral atmosphere of Venus as studies with the Mariner Vradiooccultation experiment, Astron. J., 76, 123-140;1971.
    [14]Hajj George A. and Larry J. Romans, Ionospheric electron density profiles obtained with the global positioning system: results from the GPS/MET experiment. Radio Science 33, pp. 175–190;1998.
    [15]Hocke, K. and K. Igarashi: Structure of the Earth’s lower ionosphere observed by GPS/MET radio occultation. J. Geo -phys. Res., 107, 1057, doi: 10.1029/2001JA900158,2002.
    [16] Kelly, M. C., The Earth’s Ionosphere, Plasma physics and electrodynamics, Second Edition, Acadenic Press. Inc., USA, 2009.
    [17] Ko, C. P. and H. C. Yeh, COSMIC/FORMOSAT-3 observations of equatorial F-region irregularities in the SAA longitude sector, J. Geophys. Res., in press, July, 2010.
    [18] Lei, J., S. Syndergaard, A. G. Burns, S. C. Solomon, W. Wang, Z. Zeng, R. G. Roble, Q. Wu, Y.-H. Kuo, J. M. Holt, S.-R. Zhang, D. L. Hysell, F. S. Rodrigues, and C. H. Lin, (2007), Comparison of COSMIC ionospheric measurements with ground‐based observations and model predictions: Preliminary results, J. Geophys.Res., 112, A07308, doi:10.1029/2006JA012240. ;2007.
    [19]Lusignan B, Modrell G, Morrison A, Pomalaza J, Ungar SG ,Sensing the Earth’s atmosphere with occultation satellites. Proc IEEE 4:458–467;1969.
    [20]Misra, P. and P. Enge, Global positioning system:Signals, Measurements, andPerformance,2nd edition, Ganga-Jamuna Press, Lincoln,Massachusetts,USA;2006.
    [21]Schreiner WS, Sokolovskiy SV, Rocken C, Hunt DC (1999) Analysis and validation of GPS/MET radio occultation data in the ionosphere. Radio Sci 34(4):949–966.
    [22]Tricomi, F. G., Integral Equations, Dover, Mineola, N.Y.;1985.
    [23]安守中(2002),全球衛星定位系統入門,全華科技圖書
    [24]黃清勇、朱延祥,FORMOSAT-3&COSMIC科學研究發展簡介,「大氣科學」,32,293-328,2004
    [25]黃成勇,「GPS 掩星觀測反演與反演誤差探討」,國立中央大學太空科學研究所,博士論文,2005
    [26] 陳瑋陞(2007),電離層探測儀與全球定位系統聯合觀測電離層F層電漿密度不規則體,國立中央大學太空科學研究所,博士論文
    [27] 柯孝聰(2007),福衛三號電離層資料品質控管,國立中央大學太空科學研究所,碩士論文
    [28]夏希璞(2008),利用福爾摩沙衛星三號資料分析頂部電離層與F層特性,國立中央大學太空科學研究所,碩士論文
    [29]張家榮(2008),利用GPS衛星研究台灣上空電離層閃爍現象,國立中央大學太空科學研究所,碩士論文
    [30]吳剛宏(2008),福衛三號電子濃度資料分析:電離層E層,國立中央大學太空科學研究所,碩士論文
    [31]張榮華(2009),GPS電波掩星法之研究,國立中央大學太空科學研究所,碩士論文
    Advisor
  • Yen-Hsyang Chu(朱延祥)
  • Files
  • 986203020.pdf
  • approve immediately
    Date of Submission 2011-07-03

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have dissertation-related questions, please contact with the NCU library extension service section.
    Our service phone is (03)422-7151 Ext. 57407,E-mail is also welcomed.