博碩士論文 88623003 詳細資訊




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姓名 李果穎(Kuo-Ying Lee )  查詢紙本館藏   畢業系所 太空科學研究所
論文名稱 K波段地面鏈路降雨衰減效應之研究
(An Experiment of K Band Terrestrial Propagation Through Rain)
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摘要(中) 由於全球化(Globalization)的影響下,無線通訊的重要性與日遽增,也加速了各類型無線通訊技術的蓬勃發展,如微波地面鏈路通訊系統,行動電話、衛星通信。隨著小型區域網路(LAN)及個人通訊系統(PCS)的蓬勃發展,微波地面鏈路通訊系統日趨重要。更由於使用者及傳輸資料量的增加,過去使用的C波段、X波段通訊系統已不敷使用,高頻微波波段的使用應運而生,如K波段(18-27GHz)。
不過由於此一波段在地表大氣通道傳播時,容易受到各項大氣環境因素的影響(如雲、雨滴、冰雹)而產生訊號衰減與去極化等不穩定的現象,因此無線傳輸環境之研究成為重要的課題。其中又以降雨衰減的影響最為顯著。
因此,本論文就是針對降雨衰減效應作一研究,量測及統計在中壢地區的降雨現象對於微波地面鏈路傳輸系統訊號衰減的情形,並嘗試對台灣北、中、南之大都會地區(台北、台中、高雄)的降雨衰減現象作評估。
本研究結果顯示:經過實驗比較之後,ITU(國際電信聯盟) 建議的雨衰預測模式與學者Robert K. Crane所提供的Global模式皆低估了台灣地區雨衰效應之影響。
摘要(英) The increasing demand for wireless broadband service throughout the world has motivated extensive research in high frequency band usages because of the large available bandwidth, high-frequency reuse, and the reduced size of transmitting and receiving antennas and electronic components. At frequency above 10 GHz, the attenuation due to rain becomes significant.
In this study, we conducted a research on K band terrestrial propagation system to measure the rain attenuation in Chungli. We also made an estimation of rain attenuation in 3 metropolises in Taiwan (Taipei, Taichung, and Kaoshung).
The results show that ITU-R’s rain attenuation prediction model and Robert K. Crane’s Global model both make underestimates of the rain attenuation in Taiwan.
關鍵字(中) ★ K波段
★  地面鏈路
★  降雨衰減
關鍵字(英) ★ K Band
★  Rain Attenuation
★  Terrestrial Propagation
論文目次 摘要I
ABSTRACTII
TABLE OF CONTENTSIII
LIST OF FIGURESV
LIST OF TABLESVII
CHAPTER 1. INTRODUCTION1
1.1MOTIVES AND OBJECTIVES1
1.2HISTORY1
1.3ORGANIZATION OF THE THESIS2
CHAPTER 2. SYSTEM SETUP3
2.1MEASUREMENT SYSTEM3
2.2TRANSMITTER SITE4
(A) VOLTAGE CONTROL OSCILLATOR5
(B) COUPLER AND DETECTOR7
(C) ANTENNA9
(D) ANALOG TO DIGITAL CONVERTER11
2.3RECEIVER SITE13
(A) ANTENNA13
(B) SPECTRUM13
(C) RAIN GAUGE14
2.4REMOTE CONTROL AND DATA STORAGE17
CHAPTER 3. MEASUREMENT RESULTS18
3.1OSCILLATOR OUTPUT POWER & FRIIS TRANSMISSION EQUATION18
3.2RECEIVED DATA19
CHAPTER 4. RAIN RATE DISTRIBUTION26
4.1NEED FOR RAIN-RATE STATISTICS.26
4.2EMPIRICAL CUMULATIVE DISTRIBUTION FUNCTION26
4.3ITU-R SECTOR’S RECOMMENDATIONS.27
4.4GLOBAL RAIN-RATE CLIMATE MODEL (CRANE MODEL)31
4.5EMPIRICAL PREDICTION MODEL35
4.6RAIN-RATE STATISTICAL CONVERSION36
(A) SEGAL MODEL37
(B) MOUPFOUMA’S MODEL37
4.7CWB AND OUR RAIN GAUGE38
(A) EDFS38
(B) RAIN-RATE CONVERSION46
CHAPTER 5. RESULTS AND DISCUSSIONS47
5.1PRESENT PREDICTION PROCEDURES47
(A) ITU-R (LONG-TERM STATISTICS OF RAIN ATTENUATION)47
(B) MODIFIED CRANE MODEL50
5.2COMPARISONS51
(A) SIGNAL DEGRADATION (FROM DEC. 2000 TO APR. 2001.)51
(B) PREDICTIONS OF SPECIFIC ATTENUATION AROUND TAIWAN54
CHAPTER 6 CONCLUSIONS & FUTURE WORKS55
6.1CONCLUSIONS55
6.2FUTURE WORKS56
REFERENCES57
參考文獻 [1]Balanis, C. A., ”Antenna Theory 2nd Edition,” Wiley, 1997.
[2]Bussey, H. E., “Microwave Attenuation Statistics Estimated from Rainfall and Water Vapor Statistics,” Proc. IRE, pp. 781-185, 1950.
[3]Crane, R. K., “Electromagnetic Wave Propagation Through Rain,” Wiley, 1996.
[4]Crane, R. K., ”Propagation Phenomena Affecting Satellite Communication Systems Operating in the Centimeter and Millimeter Wavelength Bands,” Proc. IEEE, vol.59, pp. 173-188, Feb 1971.
[5]Crane, R. K., ”Automatic Cell Detection and Tracking,” IEEE Trans. Geosci. Electronic., GE —17, 250-262, 1979.
[6]Crane, R. K., ”Prediction of Attenuation by Rain,” IEEE Trans. Commun., COM-28(9), 1717-1733, 1980.
[7]Crane, R. K., ” Evaluation of Global Model and CCIR Models for Estimation of Rain Rate Statistics,” Radio Sci., 20(4), 865-879,1985b.
[8]Crane, R. K., ”A Two-Component Rain Model for the Prediction of Attenuation Statistics,” Radio Sci., 17(6), 1371-1387,1982.
[9]ITU-R Rec. 530-8, International Telecommuication Union.
[10]ITU-R Rec. 837-1, International Telecommuication Union.
[11]ITU-R Rec. 838, International Telecommuication Union.
[12]Olsen et al., “The aRb Relation in the Calculation of Rain Attenuation,” IEEE Trans. Antenna and Propagation, vol. AP-26, NO.2 March 1987.
[13]Moupfouma, F., ”Model of Rain Rate Distribution for Radio System Design,” IEE Proc., 134, Pt.H, (6) 527-537,1987.
[14]Moupfouma, F. et al., “ Modeling of the Rainfall Rate Cumulative Distribution for The Design of Satellite and Terrestrial Communication Systems,” Int. Journal of Satellite Communications, vol. 13, 105-115, 1995.
[15]Moupfouma, F. et al., “ A New Theoretical Formulation for Calculation of The Specific Attenuation due to Precipitation Particles on Terrestrial and Satellite Radio Links,” Int. Journal of Satellite Communications, vol. 15, 89-99, 1997.
[16]Segal, B., “The Influence of Raingage Integration Time on Measured Rainfall-Intensity Distribution Functions,” J. At. Ocean., Tech. Dec.1986.
[17]Xu, Hao et al., “Measurments and Models for 38-GHz Point-to-Multipoint Radiowave Propagation,” IEEE J. Selected Areas in Communications, vol. 18, NO. 3, March 2000.
[18]Crane, R. K., “A Global Model for Rain Attenuation Prediction,” EASCON’78” Record, IEEE Pub, 78CH 1354-4 AES, Arlington, VA, Sept 1978.
[19]Chebil et al., “Rain Rate Statistical Conversion for the Prediction of Rain Attenuation in Malaysia,” Electronics Letters, 10th June 1999 vol. 35 NO.12.
[20]鞠志遠, “ 中壢地區Ka波段地面鏈路降雨衰減實驗,” 國立中央大學太空科學研究所碩士論文, 1998.
[21]Karasawa, Y. et al., ” One-Minute Rain Rate Distributions in Japan Derived from AMeDAS One-Hour Rain Rate Date,” IEEE Trans. GEO. Remote Sensing, vol. 29, NO. 6, Nov. 1991.
[22]Yeo, T. S. et al., “ A Two-Year Measurement of Rainfall Attenuation of CW Microwave in Singapore,” IEEE Trans. Antenna and Propagation, vol. 41, NO. 6. June 1993.
指導教授 陳錕山(Kun-Shan Chen) 審核日期 2001-6-20
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