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  1. Data Management
  2. DM-36218

Pairing vs stacking in Zernike estimation



    • Type: Improvement
    • Status: In Progress
    • Resolution: Unresolved
    • Fix Version/s: None
    • Component/s: ts_aos
    • Labels:


      Currently the AOS algorithm takes a pair of defocal images (containing images at the same field location as in comCam, or different field locations as in corner sensors of lsstCam). In each image it detects defocal point sources - donuts (either using the provided WCS information via reference star catalog, or convolving with donut template). The list of donuts is trimmed given their blending, or degree of vignetting. Donuts detected from intra and extra-focal exposures are "paired up" (currently in no particular order), and for each pair the AOS algorithm provides a list of Zernike coefficients that describe the wavefront. In turn we combine these to provide a single average wavefront estimate for each sensor to the optical feedback controller.
      In contrast, the donut images from a given sensor could also be combined into a single "stacked" extra-focal and intra-focal donut, which would then provide a single stacked-donut Zernike estimate.

      This ticket is to compare the first approach ("pairing") to the second approach ("stacking"). Find the difference (if any) between Zernikes estimated via paired-and-combined vs stacked-donuts. Check the dependence on intensity (eg. sources at 15th mag, 16th mag, 17th mag).

      then paired In a single defocal Compare the output of averaging the Zernike


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            ksuberlak Krzysztof Suberlak created issue -
            ksuberlak Krzysztof Suberlak added a comment - - edited Testing described in  https://docs.google.com/document/d/1z3otLgvoIQ6dPm_IJb2IBDwfzF5bJjoDAiYSZ54r-ss/edit?usp=sharing   
            ajc Andrew Connolly made changes -
            Field Original Value New Value
            Status To Do [ 10001 ] In Progress [ 3 ]
            sthomas Sandrine Thomas made changes -
            Remote Link This issue links to "Page (Confluence)" [ 34898 ]
            sthomas Sandrine Thomas made changes -
            Remote Link This issue links to "Page (Confluence)" [ 35180 ]
            sthomas Sandrine Thomas made changes -
            Remote Link This issue links to "Page (Confluence)" [ 35226 ]
            aclements Andy Clements made changes -
            Epic Link DM-35161 [ 1671607 ] DM-35163 [ 1671633 ]
            ajc Andrew Connolly made changes -
            Due Date 31/May/23
            aclements Andy Clements made changes -
            Epic Link DM-35163 [ 1671633 ] DM-35164 [ 1671640 ]


              ksuberlak Krzysztof Suberlak
              ksuberlak Krzysztof Suberlak
              Andrew Connolly, Krzysztof Suberlak
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