近幾年來，我國在政府部門的推動下，數位電視（DTV）的發展已逐漸取代傳統的類比電視，目前計有台視等五家業者在歐規地面數位電視傳輸系統（DVB-T）平台上架設了電波發射站、轉播站及改善站，其主要之目的為數位電視廣播具有較大多媒體傳輸量及具有抗多重路徑干擾能力，有效提升電視廣播收訊品質，並為將來多媒體互動整合帶來無限商機。然而，本島地形環境多樣化且受到人為建築影響，電波受外在環境影響較大陸地形來的嚴重，為了瞭解目前現有電波發射站受到外在或人為因素的影響程度及改善作法，就必須對目前現有發射站電波對各種環境下的涵蓋情形加以分析、評估及預測，並提供合理及可行的電波傳播模式及有效、省時涵蓋率計算方式；俾利管理者、製造商及研究者適切可行在評估地面數位電視收訊良窳之參據及決策能力。
本文以大台北地區台視TTV數位電視單頻網（SFN）作為分析與量測的對象，將地區內可能影響電波損耗因素加以歸內分析，並區分有都會區(Urban)、密集都會區(Dense Urban)、丘陵區（Hill）及山谷區(Valley)等，依其傳播效應加以分析，文中特別強調其電波涵蓋率實測方法與預測方式，並利用模擬軟體加以驗證求得其可行性方案，特別是對室內電波涵蓋部份有較詳述之分析。本論文經研究與評估後，可得到較為合理的室內與室外相對電波場強關係及各種適合於本島地形之電波傳播模式，並且也評估出較為妥適可行的涵蓋率計算方式，如在室內環境可以使用「區間比例分析法」、室外環境可以使用「圖層分析法」來作為合理可行涵蓋率計算。

In the recent decade, our government has been promoting the development of digital television (DTV) in Taiwan with ceaseless efforts. Under the government support and promotion, the incumbent 5 local TV operators have established their terrestrial DTV networks and launched commercial broadcasts networks over the whole island for a couple of years. Meanwhile, the government already announced the switch-off of analog TV at the end of 2010. Obviously, the terrestrial DTV (TDTV) will play an important role in the broadcasting industry in the near future.
Currently, local TDTV broadcasts are based on the DVB-T transmission standard, which allows multi-channel transmission of DTV programs and services in a large capacity and diverse convergence with other communication streams. However, although the DVB-T networks have now been in operation for more than 2 years, there are few surveys or studies to identify whether or not the DTV signals are universally receivable by local consumers. Hence, the coverage of terrestrial DTV services in Taiwan remains unjustified. In particular, Taiwan’s topographical and geographical conditions are too complicated to allow good and comprehensive reception of DTV signals. These circumstances would somehow have impact on the development of the DTV industry in Taiwan. Under this scenario, it is necessary to spend more efforts on the study of the DTV radio-wave coverage over the island and provide useful references for the DTV consumers, operators and manufacturers. And this concept serves the initiative of this Study.
This study is aimed at the measurement and analysis on the coverage of DTV signals in Great Taipei Area. The potential factors regarding the propagation loss of the DTV signals are part of the measuring and analyzing operations. The measured targets include urban, dense urban, and hilly/valley areas for outdoor reception as well as open space, semi-open and closed space for indoor reception.
In indoor measurement, a block-proportioned analysis scheme is applied to calculate the coverage rages of the indoor received signals. In outdoor measurement, a picture-layer analysis method is adopted to figure out the coverage rates of the outdoor reception. In practical operation, field measurement is performed in parallel with simulated measurement using a software simulator.
All of these efforts are made to find out working schemes and propagation modes feasible for measurement on local environments and to define the relations of the field strengths between outdoor and indoor reception as a reference mode available in Taiwan.

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