Satellite attitude performance during the momentum dumping mode.

In this paper, the active magnetic control technique is applied for controlling the attitude and nutation of roll/yaw ares as well as unloading the excess wheel angular momentum for a small biased-momentum satellite in a nominal operation. Two control structures are configured using 2 and 3 magnetic torquers. The proportional controller is used for the attitude and nutation control of roll/yaw ares while the proportional-integral controller is used for the wheel momentum unloading task Both systems are evaluated through numerical treatments and compared particularly during the momentum unloading process. The performance from simulations exhibits that both systems fulfill the mission requirements. However, the system that uses 3 magnetic lorquers gives a better attitude performance.

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