时间频率学报

以中国科学院国家授时中心保持的协调世界时(UTC(NTSC))为参考时间信号，采用压控晶振控制策略和卫星全视时间比对技术，在超远距离基线使用本地压控晶振复现出与UTC(NTSC)同步的高精度时间频率信号。零基线测试结果表明，以压控晶振为频率源实现的超远距离时间复现设备产生的时间信号与UTC(NTSC)偏差的标准差优于0.8 ns,最大时间间隔误差优于5.0 ns/1 d,其输出10 MHz频率信号的秒稳定度为1.25×10^-12,百秒稳定度为3.0×10^-12,万秒稳定度为6.17×10^-14,为增强型罗兰授时系统发播信号监测和超远距离时间产生提供了一种可行方法。

The Coordinated Universal Time maintained by the National Time Service Center, Chinese Academy of Sciences(UTC(NTSC)) is a reference time signal.Based on the common view time comparison technique and the VCXO controlled method, the high-precision time and frequency signal synchronizing with the UTC(NTSC) is reproduced with the local clock in the case of ultra-long baseline.Based on the results of a zero-baseline test, the standard deviation of the offset between the reproduced time signal and UTC(NTSC) is less than 0.8 ns, the maximum time interval error is better than 5.0 ns/1 d, and the stability of 10 MHz signal is 1.25×10^-12/1 s, 3.0×10^-12/100 s and 6.17×10^-14/10 ks.It provides a feasible method for monitoring the broadcast signal of the enhanced Loran time service system and ultra-long baseline time generation.