【作者】 袁海波； 屈俐俐； 广伟；

【Author】 YUAN Haibo~1,QU Lili~1,GUANG Wei~2 1 National Time Service Center,CAS,BOX 18 Lintong Xi’an Shaanxi China 710600 2 Graduate School of the Chinese Academy of Sciences,Beijing China 100039

【机构】 中国科学院国家授时中心； 中国科学院研究生院；

【摘要】 计算原子时尺度就是通过原子钟权重调整原子钟之间的相互关系,获得一个综合的、稳定性和可靠性更高的时间尺度。在原子时尺度算法中,无论是采用标准方差或是阿伦方差,其目的都是最大程度的抑制由于各种噪声引起的不确定性。ALGOS算法主要考虑到原子时尺度的长期稳定性,原子钟的取权参考该原子钟一年来的运行情况;AT1算法主要考虑的原子时尺度的实时性,原子钟的取权主要参该原子钟考近期频率变化情况,但权重选取必须考虑到原子时尺度的连续与稳定,虽然性能较好的钟获得的权重会比较大,但不能不加限制的赋予其权,而应对其进行限定,从而保证原子时尺度的稳定性和可靠性。本文主要研究原子时尺度计算中以Allan方差取权,并赋予最大权限制以及等权情况下,原子时尺度长期和短期性能的变化,为提高地方原子时的性能提供可靠的依据。更多还原

【Abstract】 When calculating the atomic time scale,the atomic clock is assigned different weights.A stable and reliable atomic time scale can be obtained by adjusting the correlation of atomic clocks.In the calculation of atomic time scale,whether the Allan deviation or the standard deviation is adopt to calculate the weight of a clock,its purpose is to suppress the uncertainty caused by the different noise of the atomic clock.ALGOS algorithm mainly consider the long term stability of atomic time scale,the weight choosing refer to the rate of an atomic clock over past year.However,the AT1 algorithm mainly consider the real time of atomic time scale,the weight choosing refer to the frequency fluctuation of an atomic clock in recent days.But for an atomic clock,its weight is not the bigger the better,so the upper weight must be determined.In this paper,the different upper weight is used to calculate the atomic time scale,and the effect for the long term and short term stability of the atomic time scale is analyzed,and the result can contribute to improving the performance of the local atomic time scale.更多还原