Date of Award

11-2019

Document Type

Thesis

Degree Name

Master of Science in Astronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

Joshua A. Hess, PhD

Abstract

As space becomes an increasingly congested domain, the risk of damage to satellite constellations is increasing. In response, there is an increasing need for capabilities for unmanned repair, refueling, and reconstitution (R3) of those constellations. Cislunar orbits offer a promising storage and low-cost transfer solution for on-orbit service vehicles and replacement satellites to leverage those capabilities. This research makes use of mixed-integer linear programming-based logistics models to determine the situations in which a cislunar mission architecture would offer a cost-effective alternative to Earth-based R3. The network models presented in this research make use of the latest developments in Event-Driven Generalized Multi-Commodity Network Flows (ED-GMCNF), a new method of optimization that enables variable time steps between events. This research combines a new version of an ED-GMCNF with cislunar trajectory optimization to evaluate both the feasibility of cislunar orbits as well as the potential effects of lunar fuel production on R3 costs. This investigation finds, through an exhaustive numerical simulation campaign, that cislunar logistics networks provide cost-effective means of R3 regiments for Earth-orbiting and cislunar satellites when a lunar fuel supply is taken into consideration. The ED-GMCNF methodology also offers a promising foundation for future work in the mission planning field.

AFIT Designator

AFIT-ENY-MS-19-D-048

DTIC Accession Number

AD1089616

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