29 July 2016 Low-signal, coronagraphic wavefront estimation with Kalman filtering in the high contrast imaging testbed
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For direct imaging and spectral characterization of cold exoplanets in reflected light, the proposed Wide-Field Infrared Survey Telescope (WFIRST) Coronagraph Instrument (CGI) will carry two types of coronagraphs. The High Contrast Imaging Testbed (HCIT) at the Jet Propulsion Laboratory has been testing both coronagraph types and demonstrated their abilities to achieve high contrast. Focal plane wavefront correction is used to estimate and mitigate aberrations. As the most time-consuming part of correction during a space mission, the acquisition of probed images for electric field estimation needs to be as short as possible. We present results from the HCIT of narrowband, low-signal wavefront estimation tests using a shaped pupil Lyot coronagraph (SPLC) designed for the WFIRST CGI. In the low-flux regime, the Kalman filter and iterated extended Kalman filter provide faster correction, better achievable contrast, and more accurate estimates than batch process estimation.
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A J Eldorado Riggs, A J Eldorado Riggs, Eric J. Cady, Eric J. Cady, Camilo Mejia Prada, Camilo Mejia Prada, Brian D. Kern, Brian D. Kern, Hanying Zhou, Hanying Zhou, N. Jeremy Kasdin, N. Jeremy Kasdin, Tyler D. Groff, Tyler D. Groff, "Low-signal, coronagraphic wavefront estimation with Kalman filtering in the high contrast imaging testbed", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99043F (29 July 2016); doi: 10.1117/12.2233909; https://doi.org/10.1117/12.2233909


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