Study On Approaching And Attitudet Racking Control Of Spatial Non-cooperative Target

With the development of space technology, research on satellite attitude tracking control theory in the field of non-cooperative rendezvous is of great importance and prospects. Under the background of attitude tracking control, the modeling and attitude tracking control algorithm in non-cooperative targeting is studied. A lot of researches have been done about the specific methods of SDRE nonlinear system of equations.First, researches on the attitude tracking control problem are introduced both domestic and foreign. The parameters of the target motion is very difficult to measure, so the relative motion model is built based on the line of sight coordinate and the center of the earth of the inertial coordinate. The relative error quaternion equations are established based on the vehicle body coordinate, to realize approaching and tracking in arbitrary initial position.Second, An effective method for solving nonlinear equations--SDRE control algorithm is studied, because the model is complex and nonlinear to solve. Then, for limitations of the SDRE control algorithm in the application research on two control methods of solving equations SDRE: q -D control algorithm and the improved Newton control algorithm has been studied. The speed of both algorithms is superior to the SDRE. Comparing two kinds of control algorithms, q -D control algorithm is faster than the improved Newton control algorithm under the permission of calculation accuracy, but calculation accuracy of improved Newton control algorithm is superior to the q -D control algorithm.Third, both of two control algorithms are used respectively to design the tracking controller and realize mathematical simulation. The tracking controller is designed firstly. Then, two methods are applied to control the attitude maneuver and approach to the target. The simulation results show the effect of studied methods.Finally, according to the components of simulation experiment system, the simulation experiment is constructed by using q -D control algorithm. And the calculation method of shrinkage ratio is provided. The processes of the GNC/dynamics simulation subsystem and measurement subsystem are designed. The implementation of simulation experiment is described in details.