可级联组网的无线时间比对系统设计  

Design of cascading network time comparison system

作　　者：刘音华[1,2,3] 张颖博 刘娅 李孝辉[1,2,3] Liu Yinhua;Zhang Yingbo;Liu Ya;Li Xiaohui(National Time Service Center,Chinese Academy of Science,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Time Reference and Applications,Chinese Academy of Sciences,Xi’an 710600,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049 [3]中国科学院时间基准及应用重点实验室,西安710600

出　　处：《电子测量技术》2024年第1期1-8,共8页Electronic Measurement Technology

基　　金：国家自然科学基金(U2031125)项目资助。

摘　　要：随着科技的发展,越来越多的场合需要实现多个终端间的纳秒量级高精度时间比对,例如现代化军事靶场、战场、雷达观测基地等。现阶段常用的纳秒量级多终端间的时间比对方法是导航卫星共视法,该方法需要搭建数据交换链路,应用的灵活性受限。本文基于无线伪随机码测距原理、双向时间比对原理和码分多址技术,设计出一套可以自适应组网的高精度时间比对系统,不需要额外搭建数据交互通路即可实现级联节点之间的纳秒量级时间比对。其次,分析了利用该系统实现纳秒量级时间比对的技术难点,并提出了相应的解决方法。最后,搭建实验平台对设计的时间比对系统进行验证。实验结果表明,在500 m的无线比对基线下,可以实现优于0.5 ns的静态时间比对精度。Along with the development of science and technology,the time comparison system with multiple cascading node network and high accuracy is necessary in more and more application field,such as modern shooting range,war field and radar observation bases.At present,navigation satellite common-view technology is widely applied in the time comparison field of multiple nodes,where the accuracy of nanosecond magnitude is necessary.But the data exchange link must be built before this common-view method is used.Thus,its application is limited when there isn’t enough resource to build the data exchange link.The time comparison system with multiple node network is designed based on the pseudo-code ranging theory,two way time comparison method and the technique of CDMA(Code Division of Multiple Access).In this system,additional data exchange link is needless.Otherwise,the important technical problems are analyzed and solved.Finally,validation experiments are done based on the designed time comparison system.The experiment results show that the time comparison uncertainty better than 0.5 ns is reached when the baseline is less than 500 meters and the change of node number doesn’t worsen the time comparison performance.

关 键 词：时间比对 级联组网 双向比对 伪码测距 通道时延校准 

分 类 号：TM935.15[电气工程—电力电子与电力传动]