X 射线脉冲星大尺度时间转换模型研究

摘要

X-ray pulsar navigation is one the most promising ways of autonomous navigation .Photon arrival time transition model determines the feasibility and real-time navigation.Because of the high complexity of the transition model , the impact of the various parameters in the time conversion model on accuracy was firstly analyzed in this paper and then about 6,000 days RXTE satellite data were u-tilized to research correct higher order terms of bending , Shapiro delay , Roemer delay and other pa-rameters' impact on the time accuracy.After evaluation, the time transition model was simplified and three simplified models of photon arrival time transition model in different transition precision were proposed .%针对X射线脉冲星导航时间转换模型计算复杂度高、难以工程应用的问题,分析了脉冲星导航中的时间转换模型,给出了完整的转换模型公式,然后利用RXTE 卫星约6000 d的Crab脉冲星观测数据研究了光线弯曲改正高阶项、太阳系内天体的Shapiro延迟、视差和脉冲星自行等项对时间转换精度的影响,最后给出了1 ns、100 ns和10 μs三种精度下的简化时间转换模型,简化的时间转换模型有效地降低了计算复杂度,能够满足不同精度的脉冲星导航应用需求.