Parallel-Computing Architecture for JWST Wavefront-Sensing Algorithms
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIGHT CENTER
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The James Webb Space Telescope JWST is the successor to the Hubble Space Telescope and will be NASAs premier observatory of the next decade. Image-based wavefront sensing phase retrieval is the primary method for ground testing and on-orbit commissioning. For ground tests at NASAs Goddard Space Flight Center GSFC and Johnson Space Center JSC, near-real-time analysis is critical for ensuring that passfail criteria are met before completion of a specific test. To address this need we have developed a computational architecture for image processing and phase retrieval. Using commercially available off-the-shelf hardware and software, we have designed, implemented, and tested a solution for high-speed parallel computing. The architecture is a hybrid solution utilizing both CPUs and GPUs and exploiting the unique advantages of each. Discussions are presented of the architecture, performance, and current limitations.
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