To improve the reliability of the pico-satellites-attitude control system, new methods were proposed, which employed magnetic coils as the only actuators to re-capture the attitude in case of flywheels failure. Two algorithms, a PD controller and a linear quadratic regulator, were applied to stabilize pico-satellite to nadir pointing using fully magnetic coils. When error occurs, the whole control system switched to the fully magnetic control mode to recover the attitude. Meanwhile, numerical simulations were also taken under the situation that only magnetic actuators available to the attitude control system of the pico-satellites. Results show that these two algorithms can achieve a certain accuracy of nadir-pointing in both situations. The attitude recovery accuracy adopting the PD control law better than 0.5° while the one with the LQR control law attains 10° or so．
XIANG Tian, WANG Hao, MENG Tao, HAN Ke, JIN Zhong-he. Attitude recovery of pico-satellites based on fully magnetic coils control algorithm. J4, 2013, 47(5): 843-852.
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