UHF無線電波在校園傳播機制之研究與模式之發展

Abstract

本研究將發展二維及三維UHF無線電波適應傳播模式（Site - Specific Mode），探討UHF電波在校園環境中一類似巨細胞環境之傳播機制。我們利用均勻繞射理論，幾何光學等嚴謹電磁理論並配合射線追跡方法來建立適應環境的電波傳播模式，該模式將直接波、地面反射波、樓面反射波、轉角繞射波及多重建物樓繞射波等傳播方式均予以考慮，該模式並經大量的實驗數據加以驗證，顯示合理的預估準確度。最後並將該模式經由自行開發的圖形介面軟體與數位化地圖資料庫相結合，完成電波涵蓋預估。

In this paper, a two - dimensional and a three - dimensional site - specific propagation models have been developed to investigate propagation mechanisms in campus environment, Here. uniform theory of diffraction, geometric optics and ray - tracing method are used to develop the models. The models have been validated with a large amount of experimental data with transmitting frequency at 1.7 - GHz. A graphic user interface has been accomplished to combine the model and the file of digitized map to result in a software package that can estimate radio coverage.