Crab脉冲星X射线计时观测数据处理与分析

Process and Analysis of X-ray Timing Data for Crab Pulsar

对我国公开发布的空间试验卫星X射线探测器观测Crab脉冲星的数据进行了处理与分析,描述了利用X射线脉冲星观测数据与卫星轨道数据建立积分脉冲轮廓与标准脉冲轮廓的方法,给出了在频域测量脉冲星脉冲到达时刻(toa)的原理方法与算法.利用每组观测数据,计算得到Crab脉冲星脉冲toa,通过与Crab脉冲星星历预报脉冲toa的比较,分析得到卫星载荷X射线探测器观测Crab脉冲星,在消除掉系统误差后,50 min积分时间的观测精度约14μs.

The X-ray timing data for the Crab pulsar obtained by the Chinese X- ray pulsar navigation test satellite are processed and analyzed. A creation method for integration and standard X-ray pulse profiles for the Crab pulsar is described by using the X-ray timing data of the satellite and the Crab pulsar ephemeris from the radio timing observations. The principle and algorithm for determining the pulsar pulse time of arrival （toa） in the frequency domain are briefly introduced. The pulsar pulse time of arrival is calculated by using the timing data of 50 min integration for each group observations. By the comparison between the observed Crab pulsar pulse time of arrival at the solar system barycenter and that predicted with the Crab pulsar ephemeris, we found that the accuracy of timing residuals is about 14 μs after the systematic trend is removed by a quadratic polynomial.