基于X射线脉冲星/多源信息深度融合的航天器自主导航方法研究

X-ray pulsar-based navigation is a promising spacecraft autonomous navigation method. Due to the extremely weak flux of pulsar, orbiting spacecraft could merely record a series of photon times of arrival which contains a nonlinear time-varying Doppler frequency component. How to extract the pulse time of arrival, which is needed by the positioning algorithm, from the recorded photon times of arrival is a key problem of X-ray pulsar-based navigation..In order to solve the problem, this project proposes an X-ray pulsar/multi-source information deeply-fused spacecraft autonomous navigation method. At first, the pulsar signal propagation mechanism with the consideration of spacecraft orbital motion is investigated, laying the foundation for the following signal processing method. Moreover, the pulsar signal processing with the aid of multi-source information is studied, in order to realize the deep fusion of the information from the pulsar and that from the multi-source in the phase of signal processing. Finally, the propagation mechanism of the errors within the proposed navigation system is investigated and the corresponding compensation methods are proposed, in order to further improve the performance of proposed method..This project will establish a systematic theoretic frame of the X-ray pulsar/multi-source information deeply-fused navigation, which is manifest value of study. In addition, this project will validate the performance of proposed method via the data from the space experiment of pulsar-based navigation.

X射线脉冲星导航是一种具有广阔应用前景的航天器自主导航方法。脉冲星流量极微弱，在轨运行的航天器仅能接收到一系列含有非线性时变多普勒频率的光子到达时间。如何从在轨接收到的光子到达时间序列中高效提取出导航计算所需的脉冲到达时间，是脉冲星导航的难点问题。. 为此，本项目提出基于X射线脉冲星/多源信息深度融合的航天器自主导航方法。首先，研究考虑航天器轨道运动统计特性的脉冲星动态信号传播机理，为动态信号处理方法奠定基础。其次，研究基于多源信息辅助的脉冲星动态信号处理方法，实现脉冲星信息和多源信息在信号处理层面的深度融合。最后，研究深融合导航系统的误差演化机理与补偿方法，进一步提升导航系统的性能。. 项目将建立起较为系统的X射线脉冲星/多源信息深度融合导航分析设计理论与方法体系，具有较为显著的学术意义。此外，本项目结合脉冲星空间实测数据对理论成果进行验证与应用，理论与实践并重，特色鲜明。

X射线脉冲星导航是一种具有广阔应用前景的航天器自主导航方法。脉冲星流量极微弱，在轨运行的航天器仅能接收到一系列含有非线性时变多普勒频率的光子到达时间。如何从在轨接收到的光子到达时间序列中高效提取出导航计算所需的脉冲到达时间，是脉冲星导航的难点问题。.为此，本项目提出基于X射线脉冲星/多源信息深度融合的航天器自主导航方法。首先，研究考虑航天器轨道运动统计特性的脉冲星动态信号传播机理，为动态信号处理方法奠定基础。其次，研究基于多源信息辅助的脉冲星动态信号处理方法，实现脉冲星信息和多源信息在信号处理层面的深度融合。最后，研究深融合导航系统的误差演化机理与补偿方法，进一步提升导航系统的性能。

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