title: Relative position finite-time coordinated tracking control of spacecraft formation without velocity measurements.
abstract: This paper investigates finite-time relative position coordinated tracking problem by output feedback for spacecraft formation flying without velocity measurement. By employing homogeneous system theory, a finite-time relative position coordinated tracking controller by state feedback is firstly developed, where the desired time-varying trajectory given in advance can be tracked by the formation. Then, to address the problem of lack of velocity measurements, a finite-time output feedback controller is proposed by involving a novel filter to recover unknown velocity information in a finite time. Rigorous proof shows that the proposed control law ensures global stability and guarantees the position of spacecraft formation to track a time-varying reference in finite time. Finally, simulation results are presented to illustrate the performance of the proposed controller.
authors.affiliation: School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China; Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. Electronic address: huql_buaa@buaa.edu.cn.
authors.forename: Qinglei
authors.initials: Q
authors.lastname: Hu
authors.affiliation: Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
keywords: Coordinated tracking; Finite-time control; Output feedback; Spacecraft formation flying