Abstract
A fundamental strategy for libration control of tethered systems in elliptic orbits is developed. Periodic libration, which is of the same period as orbital period, is shown to be proper as the cotrol objective of libration of tethered systems in elliptic orbits. Periodic control to accelerate or decelerate librations at certain points in orbit is shown as the basic control, which leads libration to be asymptotically stable to converge on the periodic libration. Libration controls by tether length rate and on-board thruster are formulated based on this fundamental strategy, and its validity is shown through numerical simulations.
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