基于GPS接收机的铷原子钟驾驭方法研究

Research on rubidium atomic clock disciplined method based on GPS receiver

以GPS接收机输出的1 pps信号为参考信号,控制铷原子钟,在对铷原子钟短期稳定性影响最小的前提下,获得较好的准确性和长期稳定性。采用最小二乘法对铷原子钟的参数进行估计,计算铷原子钟的频率调整量,对铷原子钟进行调整,使其和UTC时间保持同步。实验结果表明,受驯铷原子钟输出1 pps与UTC(NTSC)主钟钟差的标准差优于8 ns、100 s采样的ALLan方差为1.41E-12,10 000 s采样的Allan方差为4.74E-13,表明用该方法驾驭铷原子钟是成功的。

The output signal of the GPS receiver is a reference signal that is 1 pps, controlling the rubidium atomic clock. In the short-term stability for the rubidium atomic clock with minimal impact of the premise, the rubidium gets better accuracy and long term stability. The parameters of the rubidium atomic clock are estimated by using the least square method. The frequency adjustment amount of the rubidium atomic clock is calculated to adjust the ru- bidium atomic clock so that the rubidium atomic clock keeps time synchronization with UTC. Experimental results show that, the standard deviation of the clock difference between the output lpps of the rubidium atomic and the master clock of the UTC （NTSC） is better than 8 ns, the Allan variance with 100 s sampling is 1.41E -12, the Allan variance with 10 000 s sampling is 4.74E - 13. The test shows that the method used to control the rubidium atomic clock is successful.