27 June 2006 Distributed computing architecture for image-based wavefront sensing and 2D FFTs
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Proceedings Volume 6274, Advanced Software and Control for Astronomy; 627421 (2006); doi: 10.1117/12.672842
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States
Image-based wavefront sensing provides significant advantages over interferometric-based wavefront sensors such as optical design simplicity and stability. However, the image-based approach is computationally intensive, and therefore, applications utilizing the image-based approach gain substantial benefits using specialized high-performance computing architectures. The development and testing of these computing architectures are essential to missions such as James Webb Space Telescope (JWST), Terrestrial Planet Finder-Coronagraph (TPF-C and CorSpec), and the Spherical Primary Optical Telescope (SPOT). The algorithms implemented on these specialized computing architectures make use of numerous two-dimensional Fast Fourier Transforms (FFTs) which necessitate an all-to-all communication when applied on a distributed computational architecture. Several solutions for distributed computing are presented with an emphasis on a 64 Node cluster of digital signal processors (DSPs) and multiple DSP field programmable gate arrays (FPGAs), offering a novel application of low-diameter graph theory. Timing results and performance analysis are presented. The solutions offered could be applied to other computationally complex all-to-all communication problems.
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Jeffrey S. Smith, Bruce H. Dean, Shadan Haghani, "Distributed computing architecture for image-based wavefront sensing and 2D FFTs", Proc. SPIE 6274, Advanced Software and Control for Astronomy, 627421 (27 June 2006); doi: 10.1117/12.672842; https://doi.org/10.1117/12.672842

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