摘要
时间码在航空航天、金融、通信、交通和能源等领域应用广泛,定时偏差是表征时间码同步性能的重要参数。而时间码设备使用环境复杂,需长期连续加电运行,不宜拆卸。因此,需要采用现场校准技术。利用北斗共视技术,研究一种时间码现场校准方法,可远程获得精确可靠的时间参考,对常见时间码如1PPS、B(DC)码和B(AC)码等进行测量,解决时间码现场校准的难题。实验结果表明,基于该方法的现场校准装置内时基相对于UTC(BIRM)的定时偏差优于10ns,1PPS和B(DC)测量的扩展不确定度小于20ns,B(AC)测量的扩展不确定度小于1.5μs。
Time code is widely used in aerospace,finance,communication,transportation and energy,etc while timing deviation is an important parameter to characterize the synchronization performance of time code.The operation environment of time code equipment is complex where it needs to be continuously powered up for a long time,so it is not suitable for disassembly.Therefore,field calibration technology should be adopted for timing deviation measurement.In this paper,a field calibration method of time code is proposed,which utilizes Beidou common view technology to obtain accurate and reliable time reference.Time codes such as 1PPS,B(DC)code and B(AC)code can be measured so as to solve the problem of field calibration.The experimental results show that the timing deviation of the time base in the field calibration device is less than 10ns relative to UTC(BIRM).The expanded uncertainty of 1PPS and B(DC)measurement is less than 20 ns,and the expanded uncertainty of B(AC)measurement is less than 1.5μs.
作者
沈小青
李世光
李大珍
王超
王志虎
邱斌
余清华
夏伟
SHEN Xiao-qing;LI Shi-guang;LI Da-zhen;WANG Chao;WANG Zhi-hu;QIU Bin;YU Qing-hua;XIA Wei(China Satellite Maritime Tracking and Control Department,Wuxi 214431,China;Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China)
出处
《宇航计测技术》
CSCD
2023年第1期34-39,共6页
Journal of Astronautic Metrology and Measurement
关键词
时间码
现场校准
北斗共视
测量不确定度
Time code
Field calibration
Beidou common view
Uncertainty of measurement
