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本文介绍了一种新型的模拟电视无线覆盖单频网组建方案——射频已调波同步覆盖系统。该方法经国家知识产权中心对国际信息检索,未查询到类似发明。2008年5月,运用该技术方案构建的模拟电视单频网在郑州电视台成功的实现了第一个商业实用范例。2009年,又在许昌地区组建试验网,共设立三个发射点,进行试验,试验证明在交叉覆盖区域可使相对频率误差?F=0,同频保护率由52dB下降到10dB。该试验经国家广电总局检测,认为覆盖网络相干区域内所测路段的实际接收效果未见明显干扰。射频已调波同步覆盖系统成本只有精密偏置技术的1/2,这将为我国向数字电视迈进,实施大范围高效无线覆盖提供更加有效的方法。
This article describes a new type of analog TV wireless coverage single frequency network set up - radio frequency modulated synchronous coverage system. The method by the National Intellectual Property Center for international information retrieval, did not find a similar invention. May 2008, the use of the technology program to build the analog television single frequency network in Zhengzhou TV station successfully achieved the first commercial practical example. In 2009, another trial network was set up in Xuchang. A total of three launch points were set up and tested. The test proves that the relative frequency error can be reduced to 0 in the cross-coverage area and the same-frequency protection rate can be reduced from 52dB to 10dB. The test was tested by the State Administration of Radio, Film and Television that covered the actual network coverage of the road section of the actual receiving effect no significant interference. RF tuned synchronous coverage system costs only half of the precision bias technology, which will provide China with a more efficient method of implementing large-scale and efficient wireless coverage for digital TV.