以地理資訊系統為架構的無線電波傳播損耗預測和干擾分析系統

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研究生：	李志仁 Zhe-Len Lee
論文名稱：	以地理資訊系統為架構的無線電波傳播損耗預測和干擾分析系統 A Geographic Information Systems (GIS) Based System for Radio Wave Propagation Loss Prediction and Interference Analysis
指導教授：	蔡木金 Mu-King Tsay
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 電機工程學系 Department of Electrical Engineering
畢業學年度：	88
語文別：	中文
論文頁數：	95
中文關鍵詞：	地理資訊系統、傳播損耗、干擾、數值地形
外文關鍵詞：	GIS, Propagation Loss, Interference, Digital Terrain, ArcView
相關次數：	點閱：9 下載：0
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在本篇論文中，我們希望能對下列兩個重要的問題提出貢獻。
第一、對於一個新建的發射站台而言，我們希望能確保在預定的服務範圍內都能保持良好的通訊品質，因此預測傳播損耗成為一件非常重要的事情。第二、當加入了一個新建的發射站台後,評估其與周遭的發射站台間彼此的干擾現象，也是一個重要的問題。
近年來由於地理資訊系統的快速發展，各種有關地理資訊系統的應用程式和管理方法不斷的推陳出新，再加上運算用的硬軟平台有著長足的進步，所以本論文嘗試著利用地理資訊系統來建立無線電電波傳播損耗預測和干擾分析系統。

In this thesis, we hope to do some contributions about the following two themes. First, to establish a new transmitting station, the foremost consideration is to provide an excellent quality of communication services in coverage. Hence, we build a propagation loss prediction system to predict the propagation loss with different conditions. Second, after adding a new transmitting station in a region, the most significant problem is the interference between the already existed transmitting stations and the new transmitting station in the region.
In the decade, GIS have developed to be a powerful tool in the many geographic applications and computers also have developed to be a fast and powerful implement in many engineering applications. Therefore, we build a Geographic Information Systems based system for radio wave propagation loss prediction and interference analysis.

List of Figures Ⅳ
List of Tables Ⅶ
Chapter 1 Introduction…………………………………….…1
1 Motivation………………………………………………………1
2 Background……………………………………………………..3
Chapter 2 System Descriptions……………………………..……..4
1 Geographic Information Systems (GIS) ……………………..4
1.1 The Introduction of ArcView……………………………5
2 Radio Spectrum………………………………………………..11
2.1 VLF……………………………………………………..11
2.2 LF and MF………………………………………...……12
2.3 HF………………………………………………………12
2.4 VHF and UHF………………………………………….12
2.5 SHF…………………………………………………..…13
2.6 EHF…………………………………………………..…13
3 Propagation Models……………………………………………15
3.1 Propagation in Free Space………………………...…16
3.2 Propagation over a Plane Reflecting Surface…….18
3.3 Propagation over Terrain Obstacles……………….20
3.3.1 Multiple Knife-Edge Diffraction…………..22
4 Environment Parameters………………………………………26
4.1 Modification of the Terrain Elevations……………26
4.2 The Effect of the Atmosphere…………………….…29
4.3 The Distinguishing Method of the Knife-
Edge Points...32
5 Antenna Patterns…………………………………………….…36
5.1 Radiation Pattern…………………………………….…36
5.2 Isotropic Antenna………………………………………37
5.3 Half-Wavelength Dipole Antenna………………...…38
5.4 Small Dipole……………………………………………40
5.5 High Directivity, Small Beamwidth Antenna……..41
Chapter 3 The Propagation Loss Prediction System……..…42
1 Introduction……………………………………………………42
2 The User Interface……………………………………………43
3 The Algorithm…………………………………………………44
4 The Function Descriptions………………………………….…47
4.1 The Coordinate…………………………………………47
4.2 The Transmitting Stations……………………………48
4.3 The Propagation Loss Predictions………………...49
4.4 The Coverage Loss Prediction……………………….62
5 The Suitable Analytic Ranges……………………………67
Chapter 4 The Interference Analysis System………………....68
1 Introduction……………………………………………………68
2 The User Interface……………………………………………..69
3 The Algorithm…………………………………………………70
4 The Function Descriptions……………………………….……73
4.1 The Coordinate…………………………………………73
4.2 The Transmitting Stations……………………………73
4.3 The Interference Analyses………………………...…74
4.4 The Coverage Interference Analyses…..………….86
5 The Suitable Analytic Ranges…………………………………89
Chapter 5 Discussions…………..…………………………...……..90
1 The Benefits……………………………………………...…….90
2 The Shortages…………………………………………….……91
Chapter 6 Conclusion………………………………………………93
References

                                

[1]J. D. Parsons, The Mobile Radio Propagation Channel. John Wiley & Sons, 1991
[2]W. C. Y. Lee, Mobile Communication Engineering. McGraw-Hill, 1982
[3]C. A. Balanis, Antenna Theory Analysis and Design. John Wiley & Sons, 1982
[4]R. E. Ziemer, W. H. Tranter, Principles of Communications : Systems, Modulation, and Noise. Houghton Mifflin, 1988
[5]D. K. Cheng, Field and Wave Electromagnetics. Addison-Wesley, 1989
[6]金耀輝, “電信工程”, 中國電機工程學會, 1991
[7]周天穎, 周學政, “ArcView 透視 3.X”, 松崗, 1997
[8]K. Bullington, “Radio propagation at frequencies about 30 MC,” Proceedings of the I.R.E, Vol.35,No10,pp.112-136, 1947
[9]J. Epstein, D. W.Peterson, “An experimental study of wave propagation at 850 MC,” Proceedings of the I.R.E, Vol.41,No5,pp.595-611, 1953
[10]J. Daygout, “Multiple knife-edge diffraction of microwave,” IEEE Trans. Antennas Propagat. Vol.14,No.4,pp.480-489, 1985

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