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A b s t r a c tThe problem of reducing t h e angular v e . x i t i e s o f a space ve,, ..of t h e angular momenta. back c o n t r o l systems a r e dstermined, The method o f s o l u t i o n i s based onThe r e q u i r e d c o n t r o l torques a r e found as f u n c t i o n s Both I inear and nonl i n e a r t i m e -i n v a r i a n t feed- I * This r e s w r c h was conducted a t t h e M. I .T. E l e c t r o n i c Systems Laboratory w i t h support sxtended by t h e E l e c t r o n i c s Research Center of t h e N a t i o n a lAeronautics snd Space A d m i n i s t r a t i o n under research g r a n t NGF?-22-009(1241, -** Department o f i i e c t r i c a ! Engineering, :4. I .T., Cambridge, !.lass. 02139.

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