Analytical mathematical feedback guidance scheme for low-thrust orbital plane change maneuvers

Neighboring optimal control for fixed-time multi-burn orbital transfers

“…Based on this method, an increasing number of literatures, including Refs. [36][37][38][39][40] and the references therein, on the topic of the NOG for orbital transfer problems have been published. More recently, a variable-timedomain NOG was proposed by Pontani et al [33,34] to avoid the numerical difficulties arising from the singularity of the gain matrices while approaching the final time and it was then applied to a continuous thrust space trajectories [35].…”