This paper reports a design study for a space-based decametric wavelength telescope. While not a new concept, this design study focused on many of the operational aspects that would be required for an actual mission. This design optimized the number of spacecraft to insure good visibility of approx. 80% of the radio galaxies-the primary science target for the mission. A 5,000 km lunar orbit was selected to guarantee minimal gravitational perturbations from Earth and lower radio interference. Optimal schemes for data downlink, spacecraft ranging, and power consumption were identified. An optimal mission duration of 1 year was chosen based on science goals, payload complexity, and other factors. Finally, preliminary simulations showing image reconstruction were conducted to confirm viability of the mission. This work is intended to show the viability and science benefits of conducting multi-spacecraft networked radio astronomy missions in the next few years.
Abstract-Three-dimensional motion coordination in a flowfield has applications in environmental monitoring with autonomous vehicles. Motion-coordination algorithms designed using a flow-free motion model often fail to converge in even moderate flow speeds. We apply Lyapunov-based methods to design decentralized feedback laws for use in a threedimensional, time-invariant flowfield that does not exceed the speed of each platform relative to the flow. The control laws stabilize moving formations in a dynamic model of identical particles that travel at constant speed relative to the flow. Specifically, we provide theoretically justified algorithms to stabilize parallel, helical, and circular formations in a three dimensional flowfield. In ongoing work, we seek to extend the three-dimensional motion-coordination framework to address strong and time-varying flowfields that represent more realistic environmental dynamics in the atmosphere and ocean.
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