Reduction of saturn orbit insertion impulse using deep-space low thrust

Elena Fantino, Roberto Maurice Flores Le Roux, Jesús Peláez, Virginia Raposo-Pulido

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Orbit insertion at Saturn requires a large impulsive maneuver due to the velocity difference between the spacecraft and the planet. This paper presents a strategy to reduce dramatically the hyperbolic excess speed at Saturn by means of deep-space electric propulsion. The interplanetary trajectory includes a gravity assist at Jupiter, combined with low-thrust maneuvers. The thrust arc from Earth to Jupiter lowers the launch energy requirement, whereas an ad hoc steering law applied after the Jupiter flyby reduces the hyperbolic excess speed upon arrival at Saturn. This lowers the orbit insertion impulse to the point where capture is possible even with a gravity assist with Titan. The control-law algorithm, the benefits to the mass budget, and the main technological aspects are presented and discussed. The simple steering law is compared with a trajectory optimizer to evaluate the quality of the results and possibilities for improvement.

Original languageBritish English
Pages (from-to)729-740
Number of pages12
JournalJournal of Guidance, Control, and Dynamics
Volume43
Issue number4
DOIs
StatePublished - 2020

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