综合脉冲星时间尺度

发布时间：2018-07-07 07:26

本文选题：时间 + 脉冲星　；参考：《天文学报》2016年03期

【摘要】：由于截然不同的物理机制,毫秒脉冲星可产生与原子时尺度完全不同的另一类时间尺度.利用长期的脉冲星计时观测数据可建立综合脉冲星时间尺度,但通常脉冲星计时观测是非等间隔采样,并且有些脉冲星的观测间隔过长等,这些因素均对综合脉冲星时间尺度的产生造成很大的困难.因此,提出了一种新的算法来计算综合脉冲星时间尺度,即:首先选用三次样条插值方法进行内插,并使观测数据间隔均匀;其次采用Vondrak滤波方法对观测序列进行平滑处理并去除高频噪声;最后再利用加权算法产生综合脉冲星时间尺度.利用NANOGRAV(North American Nanohertz Observatory for Gravitational Waves)最新发布的长达9 yr的观测数据,计算得到了综合脉冲星时间尺度,它的长期稳定度(取样间隔大于1 yr)优于3.4×10~(-15).研究结果表明:这种方法可有效降低脉冲星计时残差中的噪声影响,同时可提高综合脉冲星时间尺度的长期稳定度.
[Abstract]:Because of different physical mechanisms, millisecond pulsars can produce another kind of time scale which is completely different from atomic time scale. A comprehensive pulsar time scale can be established by using the long-term pulsar timing observation data, but usually the pulsar timing observation is nonequidistant sampling, and some pulsars have long observation intervals, etc. These factors are very difficult to produce the time scale of integrated pulsars. Therefore, a new algorithm is proposed to calculate the time scale of the integrated pulsar, that is, the cubic spline interpolation method is used to interpolate the time scale of the integrated pulsar, and the interval between the observed data is uniform. Secondly, the Vondrak filtering method is used to smooth the observation sequence and remove the high frequency noise. Finally, the weighted algorithm is used to generate the synthetic pulsar time scale. Based on the 9 yr observation data of the North American Nanohertz Observatory for Gravitational waves, the time scale of the integrated pulsar is calculated. Its long-term stability (sampling interval > 1 yr) is better than 3.4 脳 10 ~ (-15). The results show that this method can effectively reduce the noise effect in the pulsar timing residuals and improve the long-term stability of the integrated pulsar time scale.
【作者单位】：中国科学院国家授时中心;中国科学院时间频率基准重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(11303032,11473029) 地理信息工程国家重点实验室开放基金课题(SKLGIE2013-M-1-1)资助
【分类号】：P145.6

【相似文献】