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Abstract

A reaction wheel momentum management method using a null space vector is provided. In accordance with this method, when any one of at least four reaction wheels used for triaxial control is made unavailable or degraded, a degraded wheel is used as long as possible for improving the mobility of the behavior of a satellite. The method provides momentum management for an N-number of reaction wheels W.sub.1, W.sub.2, . . . WN used for triaxial control of a satellite B by using a null space vector, and includes the steps of: (S10) measuring the current speed and momentum of the wheels in real time and comparing the measured current speed and momentum with a preset maximum speed and momentum; (S20) calculating a zero torque Tn based on a difference between the current speed and momentum and the maximum speed Wi,max and momentum Hi,max by the step (S10); (S30) adding the zero torque acquired by the step (S20) to a wheel torque Ta required for controlling and stabilizing the attitude of the satellite; and (S40) making the wheels reach an optimum bias momentum state by using the input torque of the wheels acquired by the step (S30).

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First Claim