Title: Bounded Relative Motion and Station-Keeping in the Vicinity of Libration Point Orbits Leveraging Hamiltonian Structure and Disturbance Observer Technique

Date & Time: Friday, November 6th, 2020, 11:00 AM

Location: Science Hall, Room B101

Language: Korean

Speaker: Prof. MyungGyoon Lee (Seoul National University)

Abstract

In this seminar, a novel strategy for station-keeping and formation flight of spacecraft in the vicinity of unstable libration point orbits is presented, and its performance and stability are analyzed. The presented control strategy leverages the Hamiltonian nature of the equations of motion, rather than simply applying the control theory from the perspective of "signal processing". A filtered extended high-gain observer, a kind of disturbance observer, is designed to mitigate the performance degradation of the control strategy due to model uncertainties and external disturbances.