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Optimal control for relative attitude alignment and angular velocity tracking is discussed in this paper. The spacecraft relative attitude kinematics and dynamics based on quaternions are established during the spacecraft proximity operation. Then the attitude tracking problem is formulated as a nonlinear optimal control problem. After transform the relative attitude kinematics and dynamics into the...
Concerning the problems in the process of the spacecraftpsilas autonomous navigation, the square-root unscented Kalman filter(SRUKF) is designed to estimate the relative state between the pursuing spacecraft and the target. C-W equation is discreted to iterate. For the case that all the measuring datas get from radars, the observing equation was deduced. Compared with the conventional extended Kalman...
A mathematical model of large flexible spacecraft under the influence of structually perturbations and random disturbance is developed. A continuum model, rather than a finite element model, is used. Dynamics of the system is governed by a coupled set of stochastic ordinary and partial differential equations and formulated as a stochastic evolution equation in a proper Hilbert space by using a semigroup...
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