基于软件无线电的双向时间同步系统设计与实现  

Design and implementation of two-way time synchronization system based on software Radio

作　　者：杨君豪 楚鹰军 曹骏 周志行 夏文龙[1] 郭庆功[1] YANG Jun-Hao;CHU Ying-Jun;CAO Jun;ZHOU Zhi-Hang;XIA Wen-Long;GUO Qing-Gong(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China;The Fifth Research Institute of Telecommunications Technology,Chengdu 610021,China)

机构地区：[1]四川大学电子信息学院,成都610065 [2]电信科学技术第五研究所有限公司,成都610021

出　　处：《四川大学学报（自然科学版）》2023年第1期68-74,共7页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(62071316)。

摘　　要：针对全球导航卫星系统建设成本高,信号易被干扰和欺骗等问题,本文基于Zedboard+AD9361软件定义无线电平台设计出一套小型化、高精度的无线时间同步系统.整个系统分为双向时间同步模块和无线通信模块:双向时间同步模块处理主从机时间戳的标定、偏差的计算;无线通信模块将数据进行伪码扩频、数字上变频、部分匹配滤波-快速傅里叶变换捕获,实现主从机之间的无线通信.通过主从机输出到示波器上的1 PPS信号比对测试,主从机之间的时间同步误差均方根值(RMS)为18.6 ns.In order to solve the problems of high construction cost of GNSS(Global Navigation Satellite System)and easy signal jamming and spoofing,a small and high precision wireless time synchronization system is designed based on Zedboard+AD9361 software defined radio platform.The entire system consists of two-way time synchronization module and wireless communication module:the two-way time synchronization module deals with the calibration of master and slave time stamps and the calculation of deviation;the wireless communication module realizes the wireless communication between master and slave equipments by using pseudo-code spread spectrum,DUC(digital up-conversion),PMF-FFT(partially matched filtering and fast Fourier transform)capture.By comparing 1PPS signal output to oscilloscope,the RMS of time synchronization error between master and slave is 18.6 ns.

关 键 词：精准时间协议 AD9361 PMF-FFT捕获 时间同步 

分 类 号：TN925.91[电子电信—通信与信息系统]