Abstract: A distributed integral sliding mode attitude coordination control method is proposed for the attitude coordination regulation problem of formation systems under time-varying topology conditions by introducing integral sliding mode control. Firstly, a distributed sliding mode observer with integral sliding mode is improved to realize autonomous reference attitude estimation of formation members in communication interference environment. Then, a distributed integral sliding mode controller is designed using the integral sliding surface. Its stability is proved by derivation with the homogeneity theory and the Lyapunov stability theory to achieve collaborative tracking control of the reference attitude by each formation member. The numerical simulation outcomes validate that the proposed approach enables rapid and precise coordinated synchronization of the six-satellite SAR formation's attitudes with the reference attitudes. The coordinated tracking control method based on the combined application of a distributed sliding mode estimation and a distributed integral sliding mode controller enables fast and high-precision coordinated attitude tracking for spacecraft formation systems under time-varying topology conditions.

Key words: spacecraft formation, attitude coordination tracking, integral sliding mode control, switching topology, homogeneous technique