Accession Number : ADA291492
Title : Unconventional Imaging Field Experiment Plan.
Descriptive Note : Final rept. Jun 93-May 94,
Corporate Author : ENVIRONMENTAL RESEARCH INST OF MICHIGAN ANN ARBOR ELECTRO-OPTICS LAB
Personal Author(s) : Fienup, James R. ; Cederquist, Jack N. ; Marron, Joseph C. ; Paxman, Richard G.
PDF Url : ADA291492
Report Date : DEC 1994
Pagination or Media Count : 145
Abstract : We investigated the feasibility of conducting experiments at the Innovative Science and Technology Experimental Facility (ISTEF). The experiments are to test unconventional imaging concepts that use laser illumination and pupil-plane detection. We show the trade-off between the sparsity of the number of sub-apertures and the number of speckle realizations collected. We invented and demonstrated two new algorithms for phasing heterodyne arrays that work for sparse arrays of detectors. We performed analysis showing that near-ground turbulence makes the isoplanatic patch size for a 10 km horizontal path impractically small, but for a 1 km path it can be accommodated by using a small target. We invented a new imaging modality involving collection of intensity data at multiple wavelengths from which we can reconstruct a 3-D image using an opacity constraint. We invented a new sparse-array pattern design in the shape of an arrow that fills a square OTF with a smaller number of sub-aperture than computer-optimized patterns. We showed that we can trade off background suppression for the ability to measure multiple speckles over a sub-aperture by placing the detector array in a plane beyond the focal plane. (MM)
Descriptors : *OPTICAL RADAR, *IMAGE PROCESSING, *OPTICAL DETECTION, *OPTICAL IMAGES, ALGORITHMS, COMPUTERIZED SIMULATION, HETERODYNING, SIGNAL TO NOISE RATIO, TURBULENCE, ATMOSPHERIC MOTION, ILLUMINATION, LASER BEAMS, THREE DIMENSIONAL, DIFFRACTION, CAMERAS, PATTERN RECOGNITION, TARGET DETECTION, PIXELS, PHASED ARRAYS, SPECKLE INTERFEROMETRY.
Subject Categories : Cybernetics
Optical Detection and Detectors
Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE