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脉冲星导航试验卫星(X-ray Pulsar-based Navigation-1,XPNAV-1)是中国致力于脉冲星导航空间试验验证的首颗试验卫星,旨在研究X射线光子时间数据处理分析方法,通过实测数据恢复脉冲轮廓,以验证使用国产X射线探测器观测脉冲星的能力。文章对XPNAV-1卫星科学试验任务作了介绍,给出了光子时间数据处理的步骤,建立了脉冲星X射线大尺度延时模型;针对XPNAV-1卫星实测蟹状星云(Crab)脉冲星数据,借助大尺度延时模型将光子到达时间改正到了惯性参考点,使用历元折叠方法获得了Crab脉冲星脉冲轮廓曲线,其特征的双峰结构表明国产探测器成功实测了Crab脉冲星观测。
Pulsar-based Navigation-1 (XPNAV-1) is the first experimental satellite in China that is dedicated to the validation of Pulsar navigation space experiments. It aims to study the X-ray photon time data processing and analysis method, Data recovery pulse profile to verify the use of domestic X-ray detector observation pulsar ability. In this paper, the task of XPNAV-1 satellite science experiment is introduced. The procedure of photon time data processing is given. A large-scale X-ray delay model of pulsar is established. According to the measured data of XPNAV-1 satellite Crab pulsar data , The photon arrival time was corrected to the inertial reference point by means of large-scale time-delay model, and the pulse contour curve of Crab pulsar was obtained by using the epoch folding method. The bimodal structure of the characteristic shows that the domestic detector successfully measured the Crab pulsar observation.