| 摘要(英) |
In order to study tropospheric scintillation at 19.5GHz, from 2003 to 2004 year, we setup a Ka-band terrestrial communication system to receive the single strength affected by tropospheric refractivity irregularities. The weather information, such as wind speed, wind direction, temperature, and specific humidity, were also collected simultaneously. The differential and running mean methods were employed to analyze the signals and the correlation between signal strength, wind speed, temperature, and specific humidity were calculated. We also discuss the characteristics of the slope of the power spectrum of the signals to try to realize the relation between the spectral slope and weather parameter.
The results show that positive correlations between signal intensity, wind speed, temperature, and specific humidity, were seen, in which we believe that the wind speed is major factor causing the scintillation of the signals. We also found that when the mean value of temperature and specific humidity were layer, the power spectral slope become steeper. However, where the wind speed is greater than 4m/s, the power spectral slope become gentle, and variance of wind speed seems not to show the correlation with power spectral slope. The diurnal variation of the spectral slope was also presented and discussed in this thesis. |
| 參考文獻 |
Ippolito Jr., L.J., “Radiowave Propagation in Satellite Communication＂, Van Nostrand Reinhold Company, New York, 1986 H. Tennekes and J. L. Lumley, “A First Course in Turbulence＂, Cambridge, Massachusetts, and London, England, 1973 p1057~1068, 1984 Michael A. Janssen, “Atmospheric Remote sensing by Microwave Radiometry＂, John Wiley & Sons, Inc., 1993 Ott, R.H., and M.C.Thompson, “Atmospheric Amplitude Spectra in an Absorption Region＂, IEEE Tran. on Ant. And Prop, Vol. AP-26, No.2, March 1978 Glenn Feldhake, “Estimating the Attenuation Due to Combined Atmospheric Effects on Modern Earth-Space Paths＂, PROCEEDINGS OF THE IEEE, VOL. 39, NO. 4, August 1997 Patrizia Basili,Piero Ciotti,Giovanni D＇auria,Paolo Ferrazzoli,and Domenico Solimini, “Case Study of Intense Scintillation Events on the OTS Path＂, Ieee Transactions Antenna & Propagation, Vol.38, No.1, Jan 1990 Vogel, W.J., Measurements of satellite beacon attenuation at 11.7, 19.04, and 28.56 GHz and radiometric site diversity at 18.6 GHz, Radio Science, Vol. 17, No. 6, pages 1511-1520, November-December 1982 Shuen-Peng Shih and Yen-Hsyang Chu, “Studies of 19.5 GHz Sky Radiometric Temperature: Measurements And Applications＂, Radio Science, December 15, 2000 Shih, Shun-Peng, 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 1999 施順鵬，“台灣地區Ka波段大氣傳播通道之研究＂，博士論文，國立中央大學太空科學研究所，2002. 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 許舜清, “台灣地區大氣導管現象特性之研究＂, 碩士論文, 國立中央大學, 1995 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 蔡佳君，＂低軌道衛星Ka 波段閃爍現象之研究＂ ，碩士論文，國立中央大學太空科學研究所，2003. 曾得浩，“中華衛星一號低軌道衛星 ka 波段雨衰減實驗與模型建立＂，碩士論文，國立中央大學太空科學研究所，2003. 張緒萍，“ka 波段雨衰減之分析與研究＂，碩士論文，國立中央大學太空科學研究所，2004. |
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