Unconventional Imaging Field Experiment Plan.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1994
- Accession Number
- ADA291492
Entities
People
- Jack N. Cederquist
- James Fienup
- Joseph C. Marron
- Richard G. Paxman
Organizations
- Environmental Research Institute of Michigan