A novel autonomous on board orbit maintenance law for LEO sun synchronous, Earth ground trace repeating, electric propelled satellites is developed in this paper. The law uses cascade control scheme. The internal controller changes the orbit by controlling the semimajor axis, eccentricity and inclination. The external controller changes the desired orbit for the inner control in a manner that keeps the ground trace (GT) and the local time of descending node (LTDN) within a specified tolerance. Two different approaches are developed for the outer controller, a tight control for use when a small tolerance is allowed and an open loop model based control for use otherwise.
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Ofer Salama (2008) studied this question.
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