应用于UTC(NTSC)远程复现终端中的时间间隔计数器的设计与验证

Design and verification of TIC in UTC(NTSC) remote reproducing terminal

在UTC(NTSC)远程复现终端中,时间间隔计数器的分辨率和测量精度直接影响着最后的复现精度,为更准确地将我国标准时间UTC(NTSC)传递给用户,不仅要寻求性能更高的授时手段,时间间隔计数器的设计也尤为重要。介绍了一种基于无间隙卫星共视的UTC(NTSC)远程复现系统及其核心部分——时间间隔计数器的设计与验证。时间间隔计数器基于FPGA(field-programmable gate array)加法进位链设计,实验验证其测量误差小于100ps,对UTC(NTSC)远程复现终端的复现误差贡献小于1%,满足UTC(NTSC)远程复现终端对时间间隔计数器的应用需求。

For UTC(NTSC)remote reproducing terminal,the resolution and measuring accuracy of the time interval counter(TIC)will directly affect the final reproducing accuracy.In order to transmit the national standard time UTC(NTSC)to users more accurately,not only timing method with better performance is needed,but the design of TIC is also important.This paper introduces a UTC(NTSC)remote reproducing system based on gapless satellite common view and the design and verification of its time interval counter.The TIC in this paper is designed based on FPGA additional carry chain,the experimental results show that its measuring error is less than 100 ps and it contributes less than 1%to the total error of the terminal,can meet the actual application requirements.