摘要
随着国家地面数字电视的标准出台,地面数字电视广播将要在国内开展应用。但是地面数字电视广播与地面模拟电视广播存在着一些差异,为此,广科院在分析基本传播模型ITU-RP.370、ITU-RP.1546、ITU-RP.526、Okumura-Hata特性的基础上,借助北京、广州、深圳等地搭建的地面单频网广播系统,通过专用覆盖预测软件,采用不同传播模型,对北京等地地面数字电视广播系统覆盖场强进行了理论预测;并结合北京单频网的23万个实测数据,通过计算不同传播模型下预测值与实测值的均方差,将实测结果与预测结果进行了对比分析,提出了适合我国地面数字电视移动接收时覆盖场强预测的传播模型,为我国地面数字电视电波传播模型的确定提供了基本依据。
In order to study realization ways and development direction of DTTB and to provide basic referrences for the establishment of China’s DTTB standards and frequency planning standards, the Ministry of Science and Technology issued a project named 'Research on DTTB Coverage'. This article presents the progress of the project. Based on terrestrial SFNs built in Beijing, Guangzhou and Shenzhen, this project studies the difference of coverage between digital terrestrial TV and analog terrestrial TV, and also studies network construction mode for SFN, choice of technical parameter, and feasibility solutions for areas that can’t receive DTTB signal well. The article also gives a propagation model for mobile receiving coverage field intensity forecast that suits China, and provides basic referrences for the establishment of China’s DTTB wave propagation mode.
出处
《广播与电视技术》
北大核心
2007年第11期16-25,15,共10页
Radio & TV Broadcast Engineering
