Design For The Absolute Reference System Of The Internet Of Spacecraft And Research On Its Autonomous Navigation Methods

The rapid development of the aerospace industry has led to an increasing number of on-orbit spacecraft,which in turn has formed a huge inter-satellite communication and navigation network,which can be called the Internet of spacecraft(IoS).Its reference system provides the navigation basis for the entire network,whose positioning accuracy directly affects the navigation accuracy and service capabilities of the entire network.Autonomous navigation system is the key to improve the navigation accuracy of the reference system.In this paper,aiming at the reference system of IoS,the design scheme and high-precision autonomous navigation method are researched.The main research contents and achievements are as follows.1.Study on the design method and consideration elements of the reference system,and designed a specific application scheme for the mission to Mars.First of all,the basic concepts and main features of IoS are briefly described.Secondly,based on the coverage performance,the design method of the system and the elements to be considered are analyzed.Then,according to the demand of the Mars exploration mission,considering the configuration,the strength of the navigation signal and the navigation precision,a specific application scheme of the IoS reference system that covers the Earth-Mars space is designed.Finally,based on two different measurement forms(absolute measurement and differential measurement),two different navigation schemes for the reference system are given.2.Study on the propagation mechanism and its influence of the systematic biases in X-ray pulsar navigation system.Firstly,the impact of the pulsar's angular position error on pulse template is analyzed,the analytical formula of its mean value for arbitrary time span is derived,and the corresponding compensation method is proposed.Secondly,the reference frame deviation is modeled and its impact on the navigation system is analyzed.Finally,the impact of several main error sources,such as the position error of the pulsar star,on the differential-measurement pulsar navigation system is analyzed.3.Study on the high-precision X-ray pulsar-based autonomous navigation method.First of all,as for the single-detector and sequential-observation X-ray pulsar navigation system,the systematic biases is modeled as the slow time-varying process,and the augmenting state method is provided to compensate the impact of those error sources.The navigation system is modeled,its observability matrix under the dynamic condition of the circular restricted three body problem is derived and the navigation system is proved to be observability,and its navigation performance is verified by simulation.Then,performances of the differential measurement-based X-ray pulsar navigation system and the X-ray pulsar/inter-satellite ranging integrated navigation system are compared and analyzed.The study of the dissertation could provide some ideas for the construction of space-based interplanetary navigation network,and provide theoretical references for the development of X-ray pulsar navigation system.