【摘要】 DTMB与DTMB-A采用的发射覆盖模式从发射功率、接收门限、净载荷率等方面都存在较大差别，为有效评估DTMB与DTMB-A两代地面广播标准在信号覆盖方面的差异，本文根据地面广播发射站位置、当前信号覆盖的工作模式和东帝汶首都帝力及其周边的地形特征，设计了不同区域的DTMB与DTMB-A的接收对比测试，用视频记录仪对射频信号进行采集并在实验室进行了全面分析。根据分析测试结果，本文给出DTMB与DTMB-A地面广播覆盖差异化的分析结论。更多还原

【Abstract】 The transmission coverage modes adopted by DTMB and DTMB-A are quite different from each other in terms of transmission power, reception threshold, payload data rate, etc. In order to effectively evaluate the differences in signal coverage between DTMB and DTMB-A, this paper designs the reception comparison testing between DTMB and DTMB-A in different areas. The testing points were selected according to the location of terrestrial broadcasting transmission stations, the current working mode of DTMB/DTMB-A and the topographic characteristics of the capital Dili, Timor-Leste and its surrounding areas. The RF signal were collected with Eiden4417 and analyzed comprehensively in the laboratory. According to the analysis testing results, this paper gives the analysis conclusion of DTMB and DTMB-A terrestrial broadcast coverage differentiation.更多还原