Accession Number:

ADA532391

Title:

Improving Imaging through Turbulence Via Aperture Partitioning

Descriptive Note:

Technical paper 1 Apr 2006-9 Feb 2010

Corporate Author:

BOEING LASER TECHNICAL SERVICES (LTS) INC KIHEI HI

Personal Author(s):

Report Date:

2010-02-09

Pagination or Media Count:

14.0

Abstract:

Speckle imaging techniques make it possible to do high-resolution imaging through the turbulent atmosphere by collecting and processing a large number of short-exposure frames, each of which effectively freezes the atmosphere. In severe seeing condition, when the characteristic scale of atmospheric fluctuations is much smaller than the diameter of the telescope, the reconstructed image is dominated by turbulence noise caused by redundant baselines in the pupil. I describe a generalization of aperture masking interferometery that dramatically improves imaging performance in this regime. The approach is to partition the aperture into annuli, form the bispectra of the focal plane images formed from each annulus, and recombine them into a synthesized bispectrum form which the object may be retrieved. This may be implemented using multiple cameras and special mirrors, or with a single camera and a suitable pupil phase mask. I report results from simulations as well as experimental results using telescopes at the Air Force Research Labs Maui Space Surveillance Site.

Subject Categories:

  • Electrical and Electronic Equipment
  • Lasers and Masers
  • Miscellaneous Detection and Detectors
  • Optics
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE