Flexible Space Junk Allocation & Waste Abatement (SPACE JAWA): Flexibility Framework to Screen Strategies & Options for Sustainable On-Orbit Servicing Infrastructures in LEO
Author(s)
Bowne, Madeline Murphy
Advisor(s)
Editor(s)
Collections
Supplementary to:
Permanent Link
Abstract
As mega-constellations proliferate in Low Earth Orbit (LEO), the rate of satellite re-entry is accelerating dramatically. Between the start of this thesis and its defense, over 1,420 objects have re-entered Earth's atmosphere, with this rate expected to increase substantially over the next decade. While de-orbiting satellites mitigates orbital congestion, the environmental consequences of atmospheric re-entry remain uncertain, potentially impacting the ozone layer and climate. Transitioning from single-use satellites to a circular space economy through On-Orbit Servicing (OOS) could address these concerns by making space operations more sustainable.
Despite OOS success in Geosynchronous Orbit, LEO-based servicing remains economically challenging due to low launch costs and inefficient orbital maneuvering. Existing flexibility frameworks for OOS, while valuable for understanding customer demand, lack comprehensive treatment of multi-domain uncertainty, combinatorial flexible options, and novel concepts such as temporary orbital storage. This thesis makes three distinct contributions to address these gaps. First, it introduces Collection-as-a-Service (CAAS), a novel concept for circular space economies in LEO that enables satellite collection, refurbishment, and redeployment. Second, it develops a comprehensive flexibility framework that considers both satellite constellation and servicing infrastructure perspectives, modeling evolving on-orbit servicing space logistics through Monte Carlo scenarios with decision rules. Third, it integrates quantitative policy analysis into the flexibility framework, modeling various policy schemes within the discrete event simulation to assess their impact on total cost, NOx emission reduction, refurbishment rates, and OOS viability.
Through discrete event simulation and object-oriented programming, the framework models interactions between satellite constellations and servicing infrastructure across uncertain futures, incorporating multiple uncertain variables including launch costs, manufacturing costs, and technology obsolescence. Results demonstrate that specific architectural configurations achieve sustainability improvements while maintaining cost parity with traditional approaches. Configurations featuring one warehouse with rendezvous and proximity operations-capable satellites and flexible satellite serviceability upgrades provide the best balance of cost and emission reductions. Key enablers include dual-mission launch architectures for warehouse resupply and Earth-return for Earth-based refurbishment capabilities. The framework reveals that moderate policy interventions, such as a $50,000 Orbital Use Fee that forms a subsidy fund and enables rebates for satellite collections with a lump-sum subsidy of the remaining fund at the end of the 30-year simulation period, can achieve cost neutrality while improving refurbishment throughput.
Critically, no single element independently guarantees success across all metrics; rather, integrated consideration of technical configurations, flexible deployment strategies, and policy interventions is essential. These findings validate that the proposed flexibility framework is effective for identifying context-dependent strategies that balance economic viability, environmental sustainability, and operational resilience, providing policymakers and industry stakeholders with viable pathways toward circular space economies.
Sponsor
Date
2025-12
Extent
Resource Type
Text
Resource Subtype
Dissertation (PhD)