Research On Control And Reconfiguration Of Satellite Formation Flying

Formation flying is a new paradigm in space mission design, which has been a hot view since it appeared and is regarded as trend about spacecraft technology, at the same time, there are a lot of challenges in dynamics, relative navigation, control and application.Based on the excellent characteristic and the wide application of low earth orbit, the research on formation flying, including formation dynamics and design analysis with perturbations, relative navigation, formation maintenance and control as well as formation reconfiguration problem which formation orbit transfer and maneuvers in phase, are studied detailed in the dissertation. What's more, there is a discussion on the method and the ability of local space control with formation flying. The main contents are as follows:Model building and formation designing on formation flying. From the view of dynamics and kinematics accordingly, the two models of formation flying are built, and transform matrix is also be derived between them, on this condition, the different perturbation from the J 2 perturbation arising from the aspherical nature of the Earth, drag and solar radiation pressure is analyzed, at last formation is designed when master satellite is in circle or elliptical reference orbit. Achieving the objectives of maintenance and control, therefore, understanding and utilizing the dynamics of relative motion is of significant importance.The research on relative navigation of formation flying. Three different measurement methods are proposed in the dissertation, which are laser range finder, charge coupled device sensor and a combination of laser range finder and charge coupled device sensor, relative navigation is approached respectively by extended kalman filter, unscented kalman filter and particle filter, by comparing the characteristics of extended kalman filter with that of unscented kalman filter , the conclusion can be drawn that unscented kalman filter gets better performance than extended kalman filter in the relative navigation, especially, paticle filter is fit for non-Gaussian noise well.The research on maintenance and control of formation flying. According to dynamics model of formation flying, two kind of control scheme that is LQRcontroller and potential function controller is studied in the dissertation, LQRcontroller is applied when master satellite is in circle or very small eccentricityreference orbit, and Tperturbations have no effect on formation. TPotential functioncontroller is applied when master satellite is in any reference orbit, andTperturbations have effect on formation. TThe simulation results show that the twocontrol method is effective.The research on formation reconfiguration. The technique is developed forthe numerical treatment of optimal control problems for formation systems inorder to compute optimal control laws for the reconfiguration of a group offormation flying satellites. In process of formation reconfiguration, the collisionfree,equalization of energy, limited controller and so on are regarded as restrictconditions. Nonlinear program and Genetic Algorithms are applied to satellitesformation reconfiguration, the simulation results validate t the reconfigurationmethod is feasible.The research on space combat using satellite formation flying. The differentmethod to control local space is discussed in the dissertation. the problem ofcontrolling local space using satellite formation flying is investigated as masterbeing in circle or elliptical reference orbit, the results indicate the research onspace combat using satellite formation flying is significative.In conclusion, by analyzing and simulating, it mainly makes researches onthe problems in dynamics, relative navigation, control, reconfiguration andapplication of satellite formation in the dissertation and proposes some methodson the navigation, control and the application of satellites formation flying,which maybe provide ideas for the research on formation flying in differentorbits and be of some help to the development of distributed spacecraft system.