The goal of the investigation was the development of a class of -control systems which efficiently results in high-accuracy ( 10 radiana)earth-pointing attitude motions of satellites of different configurations in elliptic orbits. The earth-pointing orientation, i e , the orientation such that one body-fixed axis is parallel to the local vertical and another is normal to the orbit plane, is required for the lifetimes of the satel The simulation studies together with the performance evaluations showed that the control systems are quite efficient as well as reliable (The acquisition system is a back-up system to the station-keeping system ) The overall control system which is very simple to realize, is given in diagram form
IV
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