中文摘要：

数字广播电视是外辐射源雷达的重要机会照射源,分布式多基地结构是外辐射源雷达的发展趋势。新一代的数字广播电视广泛采用网络化覆盖方式,这为外辐射源雷达分布式组网探测提供了天然条件,同时也对外辐射源雷达系统设计提出了更高的要求。其中首先要解决的是接收站与照射源、多个单元接收站之间的同步问题,主要包括频率和时间同步。该文针对数字广播电视信号和外辐射源雷达结构特点,分析了分布式外辐射源雷达系统同步需求,设计了基于全球定位系统（GPS）授时技术的同步方案。利用中国移动多媒体广播信号帧结构特殊性,提出了一种系统同步测试方法,并结合分布式多站实验,通过实测数据分析,验证了该同步方案的可靠性。

英文摘要：

Digital broadcasting and television are important classes of illuminators of opportunity for passive radars. Distributed and multistatic structure are the development trends for passive radars. Most modern digital broadcasting and television systems work on a network, which not only provides a natural condition to distributed passive radar but also puts forward higher requirements on the design of passive radar systems.Among those requirements, precise synchronization among the receivers and transmitters as well as among multiple receiving stations, which mainly involves frequency and time synchronization, is the first to be solved.To satisfy the synchronization requirements of distributed passive radars, a synchronization scheme based on GPS is presented in this paper. Moreover, an effective scheme based on the China Mobile Multimedia Broadcasting signal is proposed to test the system synchronization performance. Finally, the reliability of the synchronization design is verified via the distributed multistatic passive radar experiments.