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研究生:葉日欣
研究生(外文):Jih-Hsin Yeh
論文名稱:低軌道Ka波段人造衛星標識訊號特性之研究
指導教授:朱延祥
指導教授(外文):Yen-Hsyang Chu
學位類別:碩士
校院名稱:國立中央大學
系所名稱:太空科學研究所
學門:自然科學學門
學類:天文及太空科學學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:118
中文關鍵詞:波束寬閃爍Ka 波段
外文關鍵詞:BandwidthScintillationKa Band
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本論文利用中華衛星一號通訊實驗酬載來探討Ka波段標識訊號(Beacon Signal)的特性。利用機動式地面接收站(Transportable Ground Terminal,TGT)及固定式地面站(Remote Ground Terminal RGT),在2000年到2001年間所接收之標識訊號來研究接收功率的變化,同時,對大氣閃爍效應(scintillation)作初步分析。結果發現接收之標識訊號功率有隨時間下降的趨勢。而在閃爍事件的觀研究中,發現頻譜大致符合理論值-8/3之斜率。此外,在探討天線波束寬對預測衛星訊號的影響中,發現波束寬越大,預測訊號所受到的影響越明顯。另外,在大氣衰減量(t0)與地面大氣折射指數(Ns)的分析中,得到了兩者的關係式t0=-1.1713+0.0047Ns,而由TGT和RGT上微波輻射儀(Radiometer)與地面輻射儀的比較中,發現TGT和RGT上的輻射儀系統並不穩定。


From the signals transmitted by the experimental communication payload (ECP) on the ROCSAT-1, the study analyzed Beacon Signal with frequency of Ka-band. We discussed the change of the received power by analyzing the beacon signal from the Transportable Ground Terminal and the Remote Ground Terminal during 2000 to 2001. Also, we made some analysis of Preliminary Results of the scintillation.
The data indicated that the power declined with time and in the observation of the scintillation, we discovered the slope of the spectrum matched the ideal number of —8/3.Moreover, we found that the wider the bandwidth, the stronger the predicted signal would be affected. Besides, we drew a conclusion of t0 = -1.1713 + 0.0047 Ns on the relation between the attenuation of atmosphere and the atmospheric refractive index. In the comparison of TGT and RGT to 19.5 GHz Radiometers, we found the instability of the TGT and RGT system.


第一章前言 1
第二章理論基礎 4
2.1 電波傳播機制 4
2.2 自由空間衰減 9
2.3 輻射傳導理論 11
2.4 座標系統理論 16
2.5 閃爍的頻譜特性 20
2.6 地表大氣折射率 21
第三章實驗系統架構 23
3.1主要儀器簡介 24
3.2系統特性理論 30
第四章觀測結果與討論 37
4.1資料來源 37
4.2資料分析與討論 39
第五章結論與未來展望 61
參考文獻


Aldo Bellon and Isztar Zawadzki , “ Measurements of melting layer attenuation at X-band frequency ” , Radio Science , Volume 32 , Number 3 , Pages 943-955 , May-June 1997D. Chakraborty , F. Davarian ,and W. L. Stutzman , “ The Ka-band Propagation Measurements Campaign at JPL ” , IEEE Antennas and Propagation Mangazine , VOL. 35 , NO. 1 , February 1993J. M. Moran and B. R. Rosen , “ Estimation of the Propagation Delay through the troposphere from microwave radiometer data “ , Radio Science , Volume 16 , Number 2 , Pages 235-244 , March-April 1981John Haddom and Enric Vilar , “ Scattering Induced Microwave Scintillations from Clear Air and Rain on Earth Space Paths and the Influence of Antenna Aperture “ , IEEE Transactions on Antennas and Propagation , VOL. AP-34 , NO. 5 , May 1986Julius Goldhirsh , “ Slant Path and Rain-Rate Statistics Associated with the COMSTAR Beacon at 28.56 GHz for Wallops Island over a Three-Year Period “ , Transactions on Antennas and Propagations , VOL. AP-30 , NO. 2 , March 1982Robert K. Crane , ”Estimating Risk for Earth-Satellite Attenuation Prediction” , Proceedings of The IEEE , VOL 81 , NO. 6 , June 1993Shiann-Jeng Yu , Her-Shuenn Chung , “ In-Orbit Testing Results and Analyses of ROCSAT-1 Experimental Communication Payload Space Segment ” , 中華衛星一號科學成果研討會 , September 1999Stephen D. Slobin , “ Microwave noise temperature and attenuation of clouds : Satistics of these effects at various sites in the United States , Alaska , and Hawaii ” , Radio Science , Volume 17 , Number 6 , Pages 1443-1454 , November-December 1982Shuen-Peng Shih and Yen-Hsyang Chu , “ Studies of 19.5 GHz Sky Radiometric Temperature: Measurements and Applications “Shun-Peng Shih and Yen-Hsyang Chu , “ Ka Band Propagation Experiments of Experimental Communication Payload (ECP) on ROCSAT-1 - Preliminary Results ” , Terrestrial , Atmospheric and Oceanic Sciences TAO , Supplementary Issue , 145-164 , March 1999Tim J. Moulsley and Enric Vular , “ Experimental and Theoretical Statistical of Microwave Amplitude Scintillations on Satellite Down-Links “ , IEEE Transactions on Antennas and Propagation , VOL. AP-30 , NO. 6 , November 1982Yen-Hsyang Chu , Shun-Peng shih , and Ging-Shing Liu , “ First Measurement of Scintillation and Attenuation of 19.5 GHz Beacon Signal for Experimental Communication Payload of ROCSAT-1 “ 施順鵬 , “台灣地區人造衛星Ka波段傳播環境之建立與探討 ” , 碩士論文 , 國立中央大學 , 1996施順鵬 , “ 台灣地區Ka波段大氣傳播通道之研究 ” , 博士論文 , 國立中央大學 , 2002李依穎 , “ 中華衛星一號Ka波段標識訊號大氣衰減之量測研究 ” , 碩士論文 , 國立中央大學 , 2001蔡明嶧 , “ 利用中華衛星一號通訊酬載Ka波段標識訊號對閃爍效應的研究 ” , 碩士論文 , 國立中央大學 , 2001

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