台北市數位電視場強量測與電波傳播模型分析

台灣採用歐規的DVB-T數位電視廣播系統，利用OFDM調變技術的特性，建立數位電視第一單頻網路(SFN)，提供15個標準畫質(SDTV)的數位頻道。98年5月第二單頻網路也由公共電視取得測試執照，在台灣北部及南部進行HDTV的工程試播。由於電波傳播模型都是根據國外測試地區的地理環境及氣候條件所推估出來的一個傳播模式，如果要套用在不同的地區來進行模擬的話，必須要透過實測與模擬比對來驗證其準確性。本篇論文主要是利用DVB-T測試儀器記錄在台北市區公共電視26頻道(545MHz)的數位電視電場強度訊號，透過法國ATDI的ICS Telcom電波模擬軟體，選擇適用的傳播模型與量測數據進行比對，並藉此調整傳播模型的參數，找出一個適合台北市區的傳播模型。

關鍵字

數位電視；電波傳播模型

並列摘要

The digital TV broadcasting system in Taiwan is European DVB-T system. By using OFDM modulation technology, the first single frequency network (SFN-1) of digital TV provides 15 standard definition (SDTV) digital channels. Public Television Service Foundation got the license of the 2nd single frequency network (SFN-2) in May 2009, which allows the PTS to run the HDTV pilot project both in northern and southern of Taiwan. Since the radio propagation model is estimated as a transmission pattern which is based on the geographical environment and climatic of the tested areas. If one wants to apply it in different areas to carry out simulations, one have to calibrate the accuracy through the comparison between predicted and measured data. This thesis uses the DVB-T test equipment and records PTS digital TV field strength (545MHz) in Taipei. By use of the “ICS Telcom”, a simulation software developed by French ATDI Company, we can select the appropriate propagation model and compare the measured data, and then suggest a suitable model for Taipei City.