Magnetic Spacecraft Control via Output Feedback with Separation between Measurement and Actuation

In actual implementations of magnetic control laws for spacecraft attitude stabilization, the time in which Earth magnetic field is measured must be separated from the time in which magnetic dipole moment is generated. We propose a magnetic attitude stabilization law that takes into account of the latter separation. Specifically, a feedback that besides measurement of the geomagnetic field, needs measures of attitude only (output feedback) is presented, and a design method for determining its parameters is obtained. A case study is included to validate the effectiveness of the proposed control law.