时频同步是分布式探测系统中的关键技术之一。文中首先分析了分布式探测系统两种典型的处理方式对时频误差的要求,提出了一种利用卫星电视信号传递时间和时频同步的方法,介绍了其基本原理、系统构成等;随后提出了基于卫星信号传递时频信息的分布式探测系统,阐述了利用时频同步信息进行收发节点控制的原理;最后通过构建一发三收的 仿真场景,利用工程上可实现的时频精度,给出不同误差条件下的相参、非相参处理结果。结果表明,利用卫星电视信号传递时频信息可以应用在分布式探测系统中,能够获得非相参处理的效益。

Time-frequency synchronization is one of key technologies in distributed detection system. Firstly in this paper the requirement of time-frequency synchronization based on two typical processing methods in distributed detection system is analysed, a time transmission and time-frequency synchronization method using satellite television signal is proposed, and its fundamental theory and system composition are introduced. Then a kind of distributed detection system based on time-frequency transmission using satellite television signal is proposed,and the receiving-transmitting control theory using time-frequency synchronization information is explained. Finally by constructing one-transmitting and three-receiving simulation scene, based on realized time-frequency precision in engineering, the results of coherent signal processing and non-coherent signal processing under different error conditions are provided. The results show that the technology of time-frequency transmission using satellite television signal can be used in distributed detection system, realizing the benefits of non-coherent signal processing.

TN957