Study On Mission Planning And Attitude-Orbit Coupling Control Of Multi-Satellite Cooperative Proximity Operation

In recent years,on-orbit service has become the key development direction of the space powers,and space proximity operation is the key technology.Compared with the traditional single satellite operation mode,multi-satellite cooperative proximity operation has significant advantages on the flexibility,efficiency and cost,but it is more complex and difficult to model and solve,in the asepects of the cooperative control,mission planning,etc.Therefore,this paper focuses on the attitude-orbit coupling control method and mission planning method in the multi-satellite cooperative proximity operation mission.The main research contents and acheivements are as follows:The attitude-orbit coupling control method of the multi-satellite proximity fly-around-observation mission has been studied.Two kinds of mission models,i.e.,the elliptical flying-around observation and the multi-station-keeping point flying-around observation,are established,and two expected triangular formation configurations of observation satellites on elliptical and spatial circular orbits are designed.The position of the station-keeping point is designed according to the plane equiangular distance distribution between the starting position and the terminal position,and the desired attitude is that the line of sight always points to the target.The proportional-differential control law based on quaternion and angular velocity error feedback is used for attitude control and the improved artificial potential field method is used for orbit control.The simulation results show that in the elliptical flying around observation mission,the observation satellites can track the desired relative attitude and the desired orbit configuration effectively.In the multi-station-keeping point flying around observation mission,the observation satellites pass through each station-keeping point in turn,and the station-keeping time at the station-keeping point is variable.The cooperative attitude-orbit coupling control method for observing and approaching a rotating target with multiple satellites has been studied.A proximity cooperative operation mission model for fast flying around and synchronous approaching a rotating target is established,and the desired flight plane and desired attitude direction suitable for any direction in space are designed.And collision avoidance is considered,the proportional-differential control law based on error quaternion and error angular velocity feedback and a proximity safety control law based on mixed artificial potential function are derived to control attitude and orbit.The simulation results show that the observation satellites can successfully avoid the collision of other satellites and move along the desired orbit.With the support of the observation satellites information,the approaching satellites can approach and adsorb to the pre-set position of the target surface at the same time,which verifies the effectiveness of the proposed control method.A master-slave hierarchical mission planning method for multi-satellite cooperative proximity operation is proposed.Based on the idea of functional separation,a multi-satellite cooperative mission planning model considering the constraint on the angle between the observation-target and the approaching-target lines is established,and the master-slave hierarchical mission planning method is proposed.In order to test the planning efficiency of the proposed method,an evaluation time consumption model is established,and the calculation cost is analyzed by an example.The simulation results show that the proposed master-slave hierarchical programming idea can obtain the optimal mission plan and meet the requirements of the mission with observation and approaching cooperation at a lower cost.Through the reasonable distribution of calculation missions,the calculation load of master satellite and slave satellite can be balanced,and the planning efficiency can be improved effectively.In this dissertation,the mission planning method and attitude-orbit coupling control of multi-satellite cooperative proximity operation have been studied.The results and acheivements can provide a new solution for multi-satellite cooperative proximity operations,and would provide a referrence for the low-cost and flexible on-orbit service mission.