Abstract
The attitude tracking synchronization control of an orbit-predetermined leader–follower spacecraft swarm for the space moving target is discussed in this paper. The information exchange between all spacecraft is assumed to be discrete in time and on the undirected connected graph. Moreover, due to the demand for saving communication resources, wireless interference has been utilized, which allows all the neighbors of a spacecraft to access the same channel frequency spectrum simultaneously. Then the backstepping control algorithm is designed to let the spacecraft (β,A)-practically stably synchronize their states and track a time-varying trajectory in the presence of unknown fading channels. Finally, simulation is provided to verify that using the proposed control scheme, the attitude tracking synchronization can be achieved with high precision.
Highlights
IntroductionSmall spacecraft, even micro and nano spacecraft cooperating to complete complex space missions, have attracted a lot of attention [1,2]
Discrete-Time Attitude TrackingIn recent years, small spacecraft, even micro and nano spacecraft cooperating to complete complex space missions, have attracted a lot of attention [1,2]
The method in this paper is applicable to typical spacecraft attitude cooperative tracking problem
Summary
Small spacecraft, even micro and nano spacecraft cooperating to complete complex space missions, have attracted a lot of attention [1,2]. The design of the discrete control scheme for the spacecraft swarm attitude tracking synchronization system is still worthy of some attention, which constitutes the second main focus of this paper. The main contribution of this paper is to present a control law for spacecraft attitude tracking synchronization under the assumption of discrete-time communication. Different from the existing literatures that deal with limited communication by decentralizing communication topology and reducing interactive information, the communication scheme in this paper can save communication resources in proportion to the number of spacecraft. Function γ : R≥0 × R≥0 → R≥0 is of class Kw if γ(·, t) is of class K ∀t ∈ R≥0 and γ(s, ·) is decreasing to zero for each s ∈ R>0
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