1. 3 can be chosen less than 3 . However, since SGCMGs plunged into singularity, 3 is too small. If choosing 3 by this way cannot repair the tiny 3 in Eq. (10-13), it means that GSR steering law works as same as pseudo inverse steeringlaw (Equation 3), and it cannotescape singularity.
2. This work was supported by the National Natural Science Foundation of China (No. 10872029) and ExcellentYoungScholarsResearchFund of Beijinginstitute oftechnology(No. 2007YS0202).
3. 1John,E.F."AReactiveTorqueControlLawforGyroscopicallyControlledSpaceVehicles,"NASATMX-64790,1973.