Fundamental Strategies for Control of a Tethered System in Elliptical Orbits

摘要

Fundamental strategies for libration control and deployment of a tethered system in elliptical orbits are presented. Through the physical interpretations of the dynamic behavior of tethered systems in elliptical orbits, it is shown that the periodic solution is proper as a control objective. An on-off control strategy using a thruster installed to the subsatellite is examined in elliptical orbits, and the periodic on-off control, which acts at certain true anomalies in the orbit, is presented as the fundamental strategy. For tether deployment, uniform rate deployment is examined in elliptical orbits through physical interpretations of the equations of motion and numerical simulations, and it is shown that the slower deployment is preferable to deploy a tether closer to the periodic solution at the end of the deployment. It is considered that the strategies presented in this study can be applied to tethered systems in orbits of an arbitrary eccentricity, as far as the libration is possible.