Table 9 Sensors and actuators according to each AOCS mode (2)

	Standby	Momentum dumping	SST	Thrust	Safety
	Standby	Momentum dumping	SST	Thrust	Detumbling	Sun-pointing
MEMS Gyro	○	○	○	○	△	△
MEMS magnetometer	○	○	○	○	○	○
Analog sun sensor	○	○	△	○	○	○
Star tracker	○/×	○	○	○	×	×
GPS	○	○	○	○	×	×
MTQ	×	○	×	×	○	○
Reaction wheel	○	○	○	○	×	×
Thruster	×	×	×	○	×	×
Attitude determination	EKF	B estimator, EKF	EKF	EKF	-	Angular estimator
Attitude control	3-axis	3-axis	3-axis	3-axis	B-dot	2-axis

SST, solid state telescope; EKF, extended Kalman filter.