Hang Woon Lee
(Advisor: Prof. Koki Ho)

will defend a doctoral dissertation entitled,

Design and Operations of Satellite Constellations for
Complex Regional Coverage

On

Thursday, July 14 at 9:00 a.m.
Montgomery Knight Building 317
and Zoom: https://gatech.zoom.us/j/95545911120?pwd=cGc2dEdRR0tqL2xLSWtpTW1MNUdEQT…

Abstract
Fueled by recent technological advancements in small and capable satellites, satellite constellations are now shaping the new era of space commercialization creating new forms of services that span from Earth observations to telecommunications and navigation. With the mission objectives becoming increasingly complex, a new paradigm in the design and operations of satellite constellations is inevitable to make a system cheaper and more efficient.

This dissertation presents a set of novel mathematical formulations and solution methods that lend themselves to various applications in the design and operations of satellite constellation systems. The second chapter establishes the Access-Pattern-Coverage (APC) decomposition model that relaxes the symmetry and homogeneity assumptions of the classical global-coverage constellation design methods. Based on the model, this dissertation formulates an integer linear programming (ILP) problem that designs an optimal constellation pattern for complex spatiotemporally-varying coverage requirements. The third chapter examines the problem of reconfiguring satellite constellations for efficient adaptive mission planning and presents a novel ILP formulation that combines constellation design and transfer problems that are otherwise considered independent and serial in the state-of-the-art. Furthermore, the third chapter proposes a Lagrangian relaxation-based heuristic method that exploits the assignment problem structure embedded in the integrated design-transfer model. The fourth chapter extends the third chapter by investigating the multi-stage satellite constellation reconfiguration problem and develops two heuristic sequential decision-making methods based on the concepts of myopic policy and the rolling horizon procedure. This dissertation presents several illustrative examples as proofs-of-concept to demonstrate the value of the proposed work.

Committee

• Prof. Koki Ho – School of Aerospace Engineering (advisor)
• Prof. Brian Gunter – School of Aerospace Engineering
• Prof. E. Glenn Lightsey – School of Aerospace Engineering
• Prof. Harrison H. Kim – Department of Industrial and Enterprise Systems Engineering, University of Illinois at Urbana-Champaign
• Dr. Shoji Yoshikawa – Advanced Technology R&D Center, Mitsubishi Electric Corporation