Improving adaptive synchronization control of coupled spacecraft attitude and orbit

Sections 1, 2 and 3 explain the adaptive synchronization control mentioned in the title, which we believe is an improvement over previous ones. Their core consists of: "Precise dynamic model of spacecraft is essential for space missions to be completed successfully. Nevertheless, the independent orbit or attitude dynamic models can not meet the requirements of high precision tasks. We developed a 6-DOF relative coupling dynamic model based upon the relative motion dynamics equations and attitude kinematics equations described by MRP (Modified Rodrigues Parameters). In order to give the benchmarks of attitude and orbit motion respectively, the ideal spacecraft attitude and the elliptical plus exponent track orbit were given. Nonlinear synchronization control law was designed for the uncertainties of spacecraft parameters, whose close-loop system was proved to be globally asymptotically stable by Lyapunov direct method. " Finally, the simulation results, presented in Figs. 3 through 5, and their analysis illustrate preliminarily that the nonlinear synchronization control algorithm can robustly drive the orbit errors and attitude ones to converge to zero.