Research On Navigation Scheme Of Lunar Exploration Mission Based On New Orbit Of Lagrange Point

As a major project in the field of deep space exploration in China,the lunar exploration project needs to meet different technical needs in the implementation process.In the whole process of lunar exploration mission,precise navigation and positioning technology is one of the key technologies for the smooth implementation of lunar exploration project.In this paper,the design of lunar exploration navigation scheme mainly includes three aspects:Firstly,the dynamic model of three-body problem with circular restriction in lunar space is studied in detail based on the space dynamics characteristics and lunar environment characteristics of lunar exploration mission.Based on the unique dynamic characteristics of Lagrange point,the periodic orbit is solved by constructed flow function method,the quasi-periodic orbit of lunar system is solved by Poincare section method,and the three-body problem with circular restriction is solved by Poincare section method.On the basis of the problem,a method of escape time function which can calculate the periodic and quasi-periodic orbits of collinear Lagrange points systematically is designed.The basic properties of the new orbit of Lagrange points are explored and the design space of navigation constellation orbits is fully expanded.Secondly,on the basis of Lagrange point orbit calculation,the configuration design of navigation constellation is carried out,the autonomous orbit determination process of navigation constellation is studied,and the autonomous orbit determination error and geometric accuracy factors of navigation constellation are analyzed,and various alternative design schemes of navigation constellation based on Lagrange point orbit are formed.Finally,in order to remedy the problem of blind area covered by navigation constellation method,the lunar navigation method based on extended Kalman filter and beacon network is studied,and a visual navigation aided scheme based on beacon network is proposed,and the accuracy of natural beacon positioning and artificial beacon positioning is analyzed.Finally,the lunar navigation scheme based on Lagrange point navigation constellation is proposed.” Mainly,the lunar visual navigation scheme based on beacon network is supplemented by the lunar exploration navigation scheme.The research results in this paper can provide feasible alternative navigation schemes and related technical support for the implementation of China's lunar exploration project.