Exploring Design and Policy Options for Orbital Infrastructure Projects

The space industry is currently at a significant inflection point. New economies are forming in lowEarth orbit (LEO), driven by miniaturization of technologies and the promise of lower launch costs, which should then allow many of these LEO systems to capitalize on designs incorporating smaller, shorter-lived spacecraft in highly-disaggregated constellations. Meanwhile, many spacecraft at geosynchronous orbit are continuing along a trend towards increasingly massive and longer-lasting satellites, and while they do represent some of the most exquisite, highest-performing satellites ever launched, some experts now feel that such trends are unsustainable and are beginning to place increasing strain on the underlying industry. To support current and future spacecraft, orbital infrastructures have been proposed as a means of providing on-orbit services to customer spacecraft and guiding space architectures towards more sustainable paradigms. In LEO, an infrastructure of communications and data relay spacecraft is envisioned as a means of aiding new and existing space enterprises in the areas of satellite connectivity and downlink capability. Meanwhile, an on-orbit servicing (OOS) infrastructure, located primarily in geosynchronous orbit, would provide services such as repair, rescue, refueling, and upgrading of customer spacecraft, in order to alleviate the identified space industry trends. Physics and cost modeling, as well as tradespace exploration, are used to identify optimal LEO infrastructure designs, while system dynamics modeling is used to assess the trends likely to occur in the overall space industry as OOS is incorporated into space architectures. The primary conclusion from the analysis of LEO infrastructure designs is that, when designing for global connectivity, there is an optimal design point between a small constellation of larger spacecraft and a very large constellation of small spacecraft, but this will also depend on the intended mission of the infrastructure and the number of customers expecting to be serviced. Then, for an OOS infrastructure, it is determined that relatively low costs and heavy incorporation of servicing capabilities into customer architectures are needed to ensure long-term sustainability of such a project. Finally, the policy implications for both infrastructure concepts are discussed, with a heavy focus on options for the funding and development regimes employed to implement the infrastructures, as well as the major political and legal implications expected to accompany these projects. Thesis Supervisor: Dr. Daniel E. Hastings Title: Cecil and Ida Green Education Professor of Engineering Systems and Aeronautics and Astronautics