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由于费用巨大,X射线脉冲星导航初步研究阶段不可能进行空间搭载实验.为此,文章设计了一种X射线脉冲星导航半物理仿真实验系统.该系统由脉冲星信号模拟部分和导航参数解算部分组成.模拟部分采用非齐次泊松过程对光子到达太阳系质心的时间建模,时间转换后,模拟X射线探测器观测脉冲星时输出的脉冲信号.导航参数解算部分利用Delta-Correction方法解算模拟信号中蕴含的导航信息.该系统可同时模拟4颗脉冲星信号,成本低,精度高,可对脉冲星导航的信号处理和参数解算过程进行光子级仿真研究,并为后续空间搭载实验中原理样机的设计提供一定的参考.
Due to the huge cost, it is impossible to carry out space-carrying experiment in the initial research stage of X-ray pulsar navigation.Therefore, a semi-physical simulation experiment system of X-ray pulsar navigation is designed.This system consists of the simulation part of the pulsar signal and the navigation parameter solution Which is composed of several parts.The simulation part uses the non-homogeneous Poisson process to model the time when the photon reaches the centroid of the solar system.After time conversion, the pulse signal output by the pulsed satellite is simulated by the X-ray detector.The navigation parameters are solved by using Delta-Correction Method to solve the navigation information contained in the analog signal.The system can simulate four pulsar signals at the same time with low cost and high precision and can carry out photon-level simulation research on the signal processing and parameter solution process of the pulsar navigation, Space-based experiments with the prototype design to provide some reference.