基于TDC和ARM的高精度北斗授时系统设计  

Design of Beidou High Precision Time Service System based on TDC and ARM

作　　者：孙雪淋 秦明伟[1] 胡贵林 SUN Xue-lin;QIN Ming-wei;HU Gui-lin(School of Information Engineering and Southwest University of Science and Technology,Mianyang 621010,China;Sichuan Jiuzhou Electric Group Co.,Ltd,Mianyang 621010,China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]重庆九洲星熠导航设备有限公司,四川绵阳621000

出　　处：《宇航计测技术》2021年第1期27-32,共6页Journal of Astronautic Metrology and Measurement

基　　金：四川省科技计划(2019YJ0309)资助。

摘　　要：针对已有的电力、通信等授时系统精度较低的问题,设计了一种基于TDC和ARM的高精度北斗授时系统。该系统以STM32F2xx/STM32F4xx芯片作为核心信号处理器,对比标准1PPS与1PPS的相位差,结合TDC对时间延时的高精度测量技术,采用PID算法调整本地OCXO压控值,使OCXO输出稳定的时钟频率,进而达到高精度授时目的。目前,北斗接收机授时精度一般优于50ns,而授时精度低于20ns即达到高精度授时标准。实验结果表明,该方法授时精度能达到13ns,能够实现北斗高精度授时。Aiming at the low accuracy of the existing power,communication and other timing systems,a TDC-based high-precision Beidou timing system is designed.The system uses STM32F2xx/STM32F4xx chips as the core signal processor,compares the phase difference between standard 1 PPS and synchronous 1 PPS,combines TDC’s high-precision measurement technology for time delay,uses PID algorithm to adjust the local OCXO voltage control value,so that OCXO output is stable Clock frequency to achieve high-precision timing.At present,the timing accuracy of Beidou receivers is generally better than 50 ns,and the timing accuracy is less than 20 ns to achieve high-precision timing standards.Experimental results show that the timing accuracy of this method can reach 13 ns,which can realize Beidou high-precision timing.

关 键 词：时间数字转换器 ARM 比例积分微分控制器 高精度授时 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]