Research On The X-ray Pulsar-based Navigation In Deep Space Exploration

Deep space exploration is one of the main fields of the aerospace activities in the 21 century. As a key technology, autonomous navigation influences directly the missions'success. Spacecraft autonomous navigation can reduce the operational complexity of the ground-assisted system, and extends the potential space applications. This dissertation deeply studies the X-ray pulsar-based navigation in the deep space exploration, based on the priciple of X-ray pulsar-based navigation. The main contents of the dissertation are as follows.(1) The theory of X-ray pulsar-based navigation and corresponding algorithms are provided. In the first place, the space-time system used in the X-ray pulsar-based navigation was studed. Then, the X-ray pulsar-based navigation system in the deep space exploration was developed, based on the dynamics model of deep space exploration and the measurement of the X-ray pulsar-based navigation. Last but not least, the timing model using X-ray pulsar was given.(2) The algorithm for the X-ray pulsar-based navigation using singular detector was proposed. Firstly, the measurement models of X-ray pulsar-based positioning and positioning/timing using singular detector are developed, respectively. Moreover, the corresponding observability analyses are provided in order to prob the factors that might the performance of the navigation system.(3) The navigation method of spacecraft formation near the libration points of the sun-earth/moon system is developed. According to the circular restricted three-body problem, the dynamics models of absolute navigation and relative navigation are established, respectively. The comparisons of the conventional algorithm and the algorithm using singular detector are accomplished, and the factors that might affect the performances of the algorithms are given.(4) The simulation system of X-ray pulsar-based navigation was developed. Based on the physical components of X-ray pulsar-based navigation, the navigation system was divded into serval modules, the functions of which were specified respectively. Then, the modules divded was divded further to specific submodules, the functions of which are fundermental to the whole system. At last, the feasibility of such system was verified by the simulation examples with specific space missions.The achievement of the dissertation lays a solid foundation to the X-ray pulsar-based navigation in deep space exploration, and provides technological supports for the industrialization of X-ray pulsar-based navigation.