A method for performing combined control and protection bits unloading momentum wheel based on the electrical thrusters

When the present invention is based on electrical thruster control method for joint position and momentum wheel unloading protection, electrical thruster thrust vector direction of adjustment range by their own means mounted on the space restrictions and satellite, the satellite orbital position during holding or unload momentum wheel , electric propulsion thrust direction can not be guaranteed to fully meet the demand control, thrust control in the component perpendicular to the plane of the force will be required to apply additional consumption of electrical thruster control. Further, when the security bit embodiment, if a satellite can not be adjusted by the centroid of the thrust vector, the torque of the thrust generated thereby will also be additional consumption. Conversely, when the momentum wheel simply be unloaded, must also take into account the effect of additional forces, we need to counteract the symmetric ignition, during the unloading force also becomes an additional consumption. The present invention also protect the satellite position and momentum wheel unloading, by properly selecting and adjusting the thrust direction of the thrust vector.