Integrated Pose Modeling And Control For Ultra Close Formation

The ultra near formation imaging system of synthetic aperture radar(SAR)is a necessary telemetry system for users today.It obtains the characteristics of high resolution image on the ground all day and all day,which makes it widely used in military and civil aspects.Therefore,researchers from all over the world have devoted a lot of energy to the research and achieved fruitful results.The traditional modeling and control of spacecraft orbit and attitude based on dual four element number is based on rendezvous and docking,and the relevant models and controllers derived from the relative motion demand of dual spacecraft.However,there are some limitations for the integrated modeling and control of the ultra near formation spacecraft in the ultra near formation.In view of the above problems,we have studied the integrated modeling method and integrated control method of multi spacecraft orbit and attitude integration,including the following aspects.The integration of dynamic modeling problem for spacecraft orbit and attitude,choose dual four element of the mathematics tool to two spacecraft formation flying as the background,the integration of describing the orbital motion of two spacecraft in orbit and the attitude motion,the correctness of re deduced and verified two spacecraft relative motion model.Two spacecraft formation based on the model,considering the coordinate transformation strategy of multi spacecrafts,the relative position and attitude formation near integration space of three rigid satellite dynamics model is deduced,and extended to the ultra close multiple rigid spacecraft formation;the formation of integrated attitude and orbit dynamics and kinematics model of synthetic aperture formation near super system radar imaging satellites.The correctness and accuracy of the model are verified by the combination of Matlab and STK.Aiming at the control problem of spacecraft formation of super close integration,with the logarithm of dual four elements as control variables,the design of terminal sliding mode controller is designed to control strategy in super multi spacecraft formation control,the controller can achieve the desired state in finite time tracking,and has robustness to the external disturbance and spacecraft part of the model uncertainty.Through the simulation of spaceborne synthetic aperture radar system dynamics and tracking control method,to verify the effectiveness of tracking control strategy based on the new model,thus systematically establish multi satellite system in the formation of super synthetic aperture radar imaging pose coupling dynamics and control theory.It provides theoretical and technical support for the follow-up and implementation of all weather high resolution earth observation plan in China.