Small Satellites

Satellites dynamics and motion control study

Dual-spin satellite angular motion

2nd April 2015

A preprint entitled "Dual-spin satellite angular motion in magnetic and gravitational fields" is now available. In this paper dual-spin satellite equipped with a flywheel having high angular rate and/or mass is considered. The paper deals with transient motion first. Magnetic attitude control system is used for angular velocity damping purpose. Flywheel is considered in operational mode all the time, since its spinning phase may be omitted and arising angular rate dealt with instead. Time-response is characterized with approximate characteristic exponent values. Nominal gravitational attitude accuracy is assessed. Control algorithm for arbitrary in-plane attitude is proposed and relevant accuracy is estimated.