Ph.D. Proposal

Stef Crum

Advisor: Prof. Brian Gunter

Cislunar Orbit Determination and Operations through On-Orbit Observation of Non-Cooperating Target Satellites

Friday, October 4 
10:00 a.m. 
MK 317

 

Abstract

This paper outlines a framework for improving Space Domain Awareness (SDA) in Cislunar space as lunar exploration accelerates. With increased activity around the Moon, the need for accurate spacecraft tracking, safe navigation, and collision risk management is critical. By integrating multiple approaches, this study proposes a contribution to tracking spacecraft and managing collision risks near the Moon. The first approach focuses on deploying satellites around Earth-Moon Lagrange points to intercept radio signals and determine spacecraft position and velocity. Using a minimal satellite network, this method offers a cost-effective way to track lunar spacecraft and support mission operations with limited infrastructure. The second approach introduces a tracking network that monitors key energy ”gates” in Cislunar space, particularly for low-thrust spacecraft. Satellites in Halo orbits can efficiently track spacecraft entering the lunar sphere of influence, providing precise initial orbit determination for non-Keplerian orbits. Finally, the study addresses the growing risk of collisions as more satellites are deployed in lunar orbits. Simulations suggest that regular collision avoidance maneuvers will be necessary, emphasizing the need for improved SDA to manage these risks and reduce the frequency of such maneuvers. 

Committee

• Prof. Brian C. Gunter – School of Aerospace Engineering (advisor)
• Dr. Gregory Badura – GTRI Electro-Optical Systems Laboratory
• Prof. Mariel Borowitz – School of International Affairs
• Prof. John Christian – School of Aerospace Engineering
• Dr. Koki Ho – School of Aerospace Engineering