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Fractionated spacecraft

By Wikipedia,
the free encyclopedia,

http://en.wikipedia.org/wiki/System_F6

A fractionated spacecraft is a satellite architecture where the functional capabilities of a conventional monolithic spacecraft are distributed across multiple modules which interact through wireless links. Unlike other aggregations of spacecraft, such as constellations and formations, the modules of a fractionated spacecraft are largely heterogeneous and perform distinct functions corresponding, for instance, to the various subsystem elements of a traditional satellite.

History

The term "fractionated spacecraft" appears to have been coined by Owen Brown and Paul Eremenko in a series of 2006 papers, which argue that a fractionated architecture offers more flexibility and robustness than traditional satellite design during mission operations, and during the design and procurement.

But the idea dates back to at least a 1984 article by P. Molette. Molette's and later analyses concluded that the benefits of fractionated spacecraft were outweighed by their higher mass and cost. Brown and his collaborators claim that the option value of flexibility, the insurance value of improved robustness, and mass production effects will exceed any penalties, and make an analogy with distributed clusters of personal computers (PCs) which are overtaking supercomputers. A recent study by the Massachusetts Institute of Technology appears to have corroborated this latter view.

Development

In 2007, DARPA, The Pentagon's advanced technology organization, issued an announcement soliciting proposals for a program entitled System F6 which aims to prove "the feasibility and benefits" of a fractionated satellite architecture through a space demonstration. The program appears to emphasize wireless networking as a critical technical enabler, along with econometric modeling to assess if and when the architecture is advantageous over conventional approaches.

DARPA called for open source development of the networking and communications protocols and interfaces for the fractionated spacecraft modules. This unusual step was presumably in an effort to proliferate the concept and mirror in space the development of the terrestrial Internet.

In 2008, DARPA announced that contracts for the preliminary development phase of the System F6 program were issued to teams headed by Boeing, Lockheed Martin, Northrop Grumman, and Orbital Sciences.

Miscellaneous

Fractionating a communications satellite mission appears to be subject to U.S. Patent 6,633,745, "Satellite cluster comprising a plurality of modular satellites."

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Published - July 2009














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