A proposed large deployable space structures experiment for high power, large aperture missions in MEO

The Air Force Research Laboratory (AFRL) Space Vehicles Directorate has developed the deployable structures experiment (DSX) to research the technologies needed for large space structures and apertures, high-power generation, and survivability in the high radiation environment of a medium earth orbit (MEO). The proposed DSX concept is a combination of four research experiments that coupled together provides DoD with: a) transformational capability in space surveillance, b) microsats with large aperture and power, c) a validation of the key physics issues associated with active remediation of the effects of a high-altitude nuclear detonation (HAND), and d) new radiation survivability design criteria for satellite systems planned for the highly desirable medium Earth orbit (MEO) regime. The four DSX experiments are fundamental research on large deployable space structures, radiation belt remediation (RBR), thin-film photovoltaics (TF-PV), and space particle measurement in the MEO environment. Used on small satellites this capability is transformational: large apertures and high power will be available on low-cost, easily launched platforms. This research will enable the large apertures needed for missions such as space-based radar with target-tracking capability, the high-power generation capability needed for electric propulsion orbit transfer vehicles, and radiation belt remediation using space-based transmitters. The baseline DSX experiment is planned to be launch ready by late 2008 with at least one year of on-orbit operations. The 2008 launch schedule is based on the available funding profile. A schedule driven by hardware development could be ready for launch as early as late 2006. Whereas the 2008 launch date is the current baseline, AFRL is exploring options to increase funding and accelerate the launch. An overview of flight experiment concept, flight experiment objectives, and satellite description will be presented along with a discussion of the challenges and solutions for removing power, large structures for expanded apertures, and the MEO environment as constraints to space capability.