Image Reconstruction, Wave Front Sensing, and Adaptive Optics in Extreme Atmospheric Seeing Conditions

Abstract

On June 1, 2005 AFOSR awarded a grant to Michigan Technological University to investigate image reconstruction, wave front sensing, and adaptive optics in extreme imaging conditions. This is the final report for this program. The overall goal was to understand imaging under conditions where seeing is exceedingly poor, such as for space surveillance of objects at very low elevation angles, and during daytime hours. In these situations, scintillation and small isoplanatic angles dominate the image measurement and reconstruction problems. Our work was focused on performing trade-offs in the adaptive optics control algorithms for imaging under conditions of poor seeing arising from large zenith angles. In particular, we have developed a closed loop simulation of an adaptive optics system which is physically similar to the AEOS system, that uses the conventional least squares reconstructor, the exponential reconstruction, and the so-called "slope discrepancy" reconstructor. We have also examined the use of the stochastic parallel gradient descent (SPGD) algorithm for deformable mirror control in problems dominated by scintillation and anisoplanatism, and conducted a laboratory experiment to demonstrate this idea. In this report we document the results. Our work with maximum likelihood-based image reconstruction algorithms has been applied to the results provided by the adaptive optics simulation, and representative results are included here.

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Document Details

Document Type
Technical Report
Publication Date
Jun 02, 2008
Accession Number
ADA484241

Entities

People

  • Michael C. Roggemann
  • Timothy J. Schulz

Organizations

  • Michigan Technological University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Actuators
  • Adaptive Optics
  • Algorithms
  • Deformable Mirrors
  • Diffraction
  • Image Reconstruction
  • Intensity
  • Iterations
  • Least Squares Method
  • Low Elevation
  • Measurement
  • Optics
  • Simulations
  • Space Surveillance
  • Standards
  • Strehl Ratio
  • Wave Propagation

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Computer Vision.
  • Technical Research and Report Writing.

Technology Areas

  • Space
  • Space - Space Objects