地面数字电视单频网时钟传递技术设计  

Designation of SFN with Time Clock Delivery Technology Based on Nimbra Multiservice Transport Platform

作　　者：陈世平 

机构地区：[1]甘肃省新闻出版广电局微波传输中心,甘肃730010

出　　处：《广播与电视技术》2016年第7期96-98,共3页Radio & TV Broadcast Engineering

摘　　要：以往国内外地面数字电视单频网时钟同步基本上都是采用外接GPS时钟实现,对于GPS时钟的过度依赖不仅很容易对UTC信号的接收产生干扰,而且易受环境因素影响,还有一个更重要的原因就是GPS的军方控制属性。因此,结合GPS时钟的局限性,对于寻找一条独立于GPS的其他形式时钟传递技术,对地面数字电视单频网的建设具有非常实际的意义。本文主要论述了基于Nimbra多业务传输平台单频网在IP传输机制下如何脱离GPS进行时钟的传递。Considering the infrastructure worldwide, it should be necessary to propose some new ideas about future DTT construction. Today, time delivering for synchronization of DTT is usually by installing external GPS （Global Positioning System）. What it brings, we highly depend on GPS, which adds additional costs. GPS would affect the receiving of UTC signals, the quality of GPS also depends on weather conditions. The most important is that GPS is military controlled which would be a concern to some countries. Considering disadvantages of GPS, it would be meaningful for time delivering in DTT SFN network infrastructure in other forms. Thus, this chapter mainly describes how to deliver time without GPS.

关 键 词：DTT SFN 时钟传递 Nimbra多业务平台 

分 类 号：TN94[电子电信—信号与信息处理]