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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20191017T103000
DTEND;TZID=Atlantic/Canary:20191017T113000
UID:iactalks-1348
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1348
CREATED:2019-10-17T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Adaptive Optics for Space Situational Awareness
DESCRIPTION:Adaptive Optics for Space Situational Awareness\nDr. Steve Wedd
 ell\n\nWe are developing and will commission a space debris and satellite 
 imaging system in New Zealand to improve image resolution of Earth orbitin
 g objects. Our simplified, low-cost approach is based on restricting possi
 ble regions where orbiting satellites and large space debris objects pass 
 through the Galactic plane, where they can be detected within a background
  of natural stars. We will use a modular, wide-field adaptive optics (AO) 
 system to estimate the spatially variant point spread function (SVPSF) usi
 ng multiple natural guide stars (NGSs) to compensate for atmospheric turbu
 lence over a wide field-of-view (FoV). To achieve this, our custom designe
 d geometric wavefront sensor will provide estimates of phase perturbations
  from three or more isoplanatic patches. A combination of closed- and open
 -loop adaptive optics is employed. The closed-loop system will use a brigh
 t NGS for low-order aberration reduction using a Shack Hartmann wavefront 
 sensor for correcting the optical path using a tip/tilt mirror system in r
 eal-time. Our open-loop system will estimate wavefronts from three of more
  natural stars and use atmospheric tomography to determine the SVPSF, off-
 line. From the SVPSF estimate, deconvolution from wavefront sensing is use
 d to remove high-order aberrations fast moving target objects that will be
  imaged using a separate detector, synchronised with our AO cameras. A mod
 el for this hybrid AO system is described in this talk and its implementat
 ion will provide a platform to test novel methods for system refinement.
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