Title page for 90521084


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Student Number 90521084
Author Shih-Chieh Wang(王詩傑)
Author's Email Address No Public.
Statistics This thesis had been viewed 2006 times. Download 1566 times.
Department Electrical Engineering
Year 2002
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title The Design and Implementation of Receiver Modules for a 36.5 GHz Microwave Radiometer
Date of Defense 2003-06-28
Page Count 123
Keyword
  • ADC
  • Digital Correlator
  • Microwave Radiometer
  • Sensitivity
  • Abstract In the thesis,the 36.5 GHz Microwave Total Power Digital Radiometer is designed,implemented and simulated. Include RF front end, analog to digital converter and digital correlator. The superheterodyne structure is applied on the design of receiver frond end. The 36.5 GHz RF signal is then downconverted to 500 MHz IF signal using a mixer-preamplifier. The gain of the IF amplifier are determined in the measurement to achieve the full-scale input of analog-to-digital converter.
    The flash analog to digital converter digitizes full scale input into 6-bit digital words at an update rate of 1 Giga Sample Per Second (GSPS) . It not only results in the required sensitivity of the radiometer, it also makes the system possibly extended in the future using the direct-sampling approach. Two statistical model of noise signal in digital radiometer are also studied. The narrow band noise signal is modeled as a Gaussian random process. A computer program is developed to help understand the relationship between Noise-Equivalent sensitivity and quantization resolution.
    Finally the prototype of 36.5 GHz Microwave Total Power Digital Radiometer is presented. Future works will involve realizing the digital correlator to verify the sensitivity predicted by statistical models.
    Table of Content 第一章導論1
    1.1研究目的1
    1.2論文介紹1
    第二章輻射計系統介紹3
    2.1輻射計簡介3
    2.2接收器原理4
    2.2.1 雜訊功率及等效雜訊溫度4
    2.2.3 靈敏度8
    2.2.4 動態範圍9
    2.3輻射計原理14
    2.3.1 全功率輻射計(TPR)︰14
    2.3.2 迪克輻射計(DR)︰16
    2.3.3 雜訊注入輻射計(NIR)︰17
    2.4全功率數位接收器(TPR)方塊圖19
    第三章天線及射頻前端(RF Front End)的實現25
    3.1天線25
    3.2連接器28
    3.3射頻放大器29
    3.4射頻濾波器32
    3.5降頻元件及其週邊元件33
    3.6中頻帶帶通濾波器37
    3.7輻射接收器的靈敏度與雜訊溫度40
    3.8中頻放大器43
    3.9各元件量測結果48
    第四章類比數位轉換器的實現與靈敏度分析58
    4.1轉換器原理58
    4.1.1取樣與保持時間58
    4.1.2總諧波失真60
    4.1.3訊雜比60
    4.1.4訊雜及失真比61
    4.2類比數位轉換器的電路製作62
    4.2.1SPT7610的功能介紹62
    4.2.2驅動電路之設計與實現64
    4.3類比數位轉換器測試68
    4.4輻射接收器系統的數位分析69
    4.5直流偏壓漂移之統計模組70
    4.6有限取樣之統計模組78
    第五章結論93
    參考文獻95
    附錄一 Matlab程式97
    附錄二 廠商所附之元件規格111
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    [6]F. T. Ulaby , R. K. Moore, A. K. Fung, Microwave Remote Sensing: Active and Passive, Volume , Microwave Remote Sensing,Fundamentals and Radiometry, Addison Wesley.
    [7]D. M. Pozar, Microwave Engineering , John Wiley & Sons, 1998.
    [8]J. R. Lee, J. H. Cho, and S. W. Yun, “New Compact Bandpass Filter Using Microstrip  Resonators with Open Stub Inverter,” IEEE Microwave and guided wave letters, 2000.
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    [10]M. A. Fischman and A. W. England, “Sensitivity of a 1.4GHz direct sampling digital radiometer,” IEEE Trans., 1999.
    [11]R. Thompson, J. Moran, G. W. Swenson, JR., Interferometry and Synthesis in Radio Astronomy , John Wiley & Sons, 1986.
    [12]Ziemer, Tranter, Princles of communications : systems ,modulation ,
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    [13]A. Brown, and B. Wolt, “Digital L-band receiver architecture with 
    direct RF sampling,” Proc.IEEE Postion Location and Navigation Symp., 1994.
    [14]M. A. Fischman and A. W. England, “A direct-sampling receiver for
    synthetic thinned array radiometer ,” Proc.of IGARSS`98, 3, 1998.
    [15]M. A. Fischman and A. W. England, “An L-band direct dampling digital radiometer:design and performance evaluation,” Proc.of IGARSS `99, 1999.
    [16]D. L. Sharpin and J. B. Y. Tsui, “ Analysis of the Linear Amplifier/Analog-Digital Converter Interface in a Digital Microwave Receiver ,” IEEE Trans., 1995.
    [17]D. M. Akos and J. B. Y. Tsui, “Design and implementation of a direct digitization GPS receiver front end,” IEEE Trans.Microwave Theory Tech.,1996.
    [18]B. F. C. Cooper, “ Correlators with two-bit quantization,” Aust. J.   Phys., 1970.
    [19]米山壽一, 陳丁再譯, A/D轉換器入門, 全華科技圖書股份有限公司, 1995.
    [20]曾中一, 大氣衛星遙測學, 渤海堂文化事業公司.1988.
    Advisor
  • Tsen-Chieh Chiu(丘增杰)
  • Yuei-An Liou(劉說安)
  • Files
  • 90521084.pdf
  • approve immediately
    Date of Submission 2003-07-02

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