Guidance Method For Approaching Non-cooperative Spacecraft

With the increasing frequency of human activities in space,various kind s of space missions have different needs.It is of great signi ficance and value that the approach mission to non-cooperative spacecraft can be widely used in space target monitoring,in-orbit service and space confrontation.Based on this research area,this paper focuses on the approach guidance method of non-cooperative spacecraft and related control methods.Spacecraft motion model is built.In this paper,a coordinate system is established,and the movement of the tracking spacecraft and the target space craft is modeled,so as to realize the modeling of the tracking aircraft's position and attitude movement and the target spacecraft's position movement.Attitude control research.Stable and reliable attitude control is the basis of guidance and control.In this paper,an attitude control method based on quaternion is adopted in the process of intermediate guidance and terminal guidance.This method can effectively avoid the singular problem in Euler angle form.In the course of midcourse guidance,the orbit correction and adjustment needs to be combined with the specific attitude.This process often needs to carry out the large angle attitude maneuver.The terminal guidance process requires accurate attitude and the ability to track line of sight angle.According to the different characteristics of attitude change in the middle and terminal guidance,the command design of controller is carried out respectively.Simulation results show that the proposed method can effectively control the attitude of the chaser spacecraft.Research on space noncooperative target approach guidance method.This process takes place in the terminal guidance,which needs to rely on the line of sight information provided by the seeker which is used for guidance.This part firstly establishes the relative motion model between the tracking spacecraft and the target spacecraft,and then designs two approach guidance methods from different perspectives.The first method is to solve the line of sight information of the approach point through the position relationship between the approach point and the target,and then designs the guidance instruction accordingly.Another method is to use the bias guidance strategy to design the relationship between the zero-control miss distance and the bias distance.By adding a bias item in the guidance instruction,the tracking spacecraft can be guided to the approach position gradually.Simulation results show that both methods can achieve the effect of approach guidance.3D visual scene design.Aiming at the research background of approaching the non-cooperative target in space,a set of 3D visualization scene software is designed,aiming to speed up the test process of approach guidance law.The software can show the flight status and information of the tracking spacecraft in the process of approaching the target spacecraft in detail,which improves the design efficiency and provides a convenient and fast way to verify the flight simulation effect.The dissertation develops in-depth research on the above problems,and realizes the approach guidance method to the non-cooperative spacecraft,and further verifies the effectiveness through simulation experiments.In addition,the 3D visualized scene is valuable in engineering.