Processing and Analysis of X-Ray Pulsar-Based Navigation Test Satellite Observation Data
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摘要:脉冲星导航试验卫星（X-ray Pulsar-based Navigation-1，XPNAV-1）的第一批观测数据公开发布，利用国际天文协会（International Astronomical Union，IAU）的标准基本天文程序库和喷气推进实验室（Jet Propulsion Laboratory，JPL）星历对数据进行处理，得到了35个光子到达太阳系质心时间序列的文件。基于历元折叠和已知的星历参数得到了35个脉冲积分轮廓，使用核回归法对轮廓进行了降噪处理，并分析了历元折叠时bin数对计时残差的影响。结果表明，观测数据有效，能够得到较好的脉冲积分轮廓，实现了对Crab星的观测，核回归算法有效改善了bin数对计时残差的影响，拟合前计时残差均方根约40 us。Abstract:The first batch observation data of the X-ray pulsar-based navigation test satellite were released. We get 35 files of the time of the arrival of the photons using the standard basic astronomical program library proposed by International Astronomical Union and the JPL ephemerides. Using the method of epoch folding and the known ephemeris parameters,35 pulse integral profiles are obtained. The kernel regression method is used to reduce the noise. The influence of the folding bin number on time residual is analyzed. The results show that the observation data is effective,and the pulse integral profiles can be obtained,and the detection of crab star is realized. The kernel regression algorithm effectively reduces the effect of the bin number on the time residual. The rooted-mean-square of the pre-fit timing residual is about 40 μs.
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