Optimal Attitude Takeover Control of Failed Spacecraft with Model Uncertainties

In on-orbit service, attitude takeover control of failed spacecraft is a prerequisite of numerous tasks, such as onorbit maintenance and on-orbit life extension. In takeover control missions, fuel consumption is a core key metric. Accordingly, attitude takeover control of spacecraft with model uncertainties with the minimum fuel consumption is studied in this paper. Concentrated on the optimal fuel consumption takeover control of failed spacecraft by nanosatellites, a control method based on fuzzy theory and inverse optimal control principle is proposed. Firstly, an auxiliary nonlinear system is constructed. Then on the basis of this auxiliary system, fuzzy logic systems (FLSs) are utilized to estimate the unknown nonlinear dynamics. Finally, combined with the inverse optimal principle and adaptive backstepping design theory, an optimal control law is designed. Numerical simulations are carried out to demonstrate the feasibility and effectiveness of the proposed control method.