Spherical Magnetic Dipole Actuator for Spacecraft Attitude Control

Earth’s Magnetic Field for Spacecraft Attitude Control Applications (TECHNICAL NOTE)

In this paper the earth’s magnetic field is simulated precisely while the intensity and direction of the field are verified with one of the standard references for selected points on the earth and the results are compared with some low-order models. In another simulation, the complete model is compared with a common approximate model. The magnetic field in orbital frame is described and to empl...

Adaptive Spacecraft Attitude Tracking Control with Actuator Uncertainties

An adaptive control algorithm for the spacecraft attitude tracking problem when the spin axis directions and/or the gains of the flywheel actuators are uncertain is developed. A smooth projection algorithm is applied to keep the parameter estimates inside a singularityfree region and avoid parameter bursting. Numerical examples show that the controller successfully deals with unknown misalignme...

Spacecraft attitude control using magnetic actuators

Fully magnetic attitude control for spacecraft subject to gravity gradient

This paper presents stability and control analysis of a satellite on a near polar orbit subject to the gravity torque. The satellite is actuated by a set of mutually perpendicular coils. The concept is that interaction between the Earth's magnetic "eld and a magnetic "eld generated by the coils results in a mechanical torque used for attitude corrections. Magnetic actuation due to its simplicit...

Passive Attitude Control for Spacecraft

The stability of spacecraft attitude is studied with considering sinusoidal disturbance. A passive attitude controller without angular velocity measurement for spacecraft described by quaternion is designed. The passive controller has no information related to system parameters. So it has robustness to model error and uncertainty of model parameters. The stability of spacecraft attitude control...