High-resolution imaging by phase retrieval and discrimination using speckle. Volume 1. Final report, August 1987-January 1989

Technical Report · Wed Mar 01 04:00:00 EST 1989

OSTI ID:7166289

Concepts for unconventional sensors capable of high-resolution imaging and parameter estimation for the SDI midcourse discrimination application were developed. The basic sensor consists of a large filled array of small-aperture receivers that measure a laser-illuminated object's Fourier intensity in the aperture of the receiver. Reconstruction of a high-resolution image using a phase-retrieval algorithm was investigated via theoretical analysis, computer simulations, and laboratory experiments. In particular, modification of the basic sensor to include a small-aperture, diffraction-limited imager within the array was studied. A method was developed to use the additional low-resolution image data in the process of reconstructing a high-resolution image. This method first retrieves the Fourier phase over the small aperture of the low resolution imager using the Gerchberg-Saxton algorithm and then proceeds with phase retrieval over the entire array aperture using the iterative Fourier-transform algorithm. This method was successfully demonstrated via computer simulations. Reconstruction of the image of a simple two-part object from Fourier intensity data gathered in a laboratory experiment was also achieved. Non-imaging, speckle correlation methods were developed that use the data provided by the large array of receivers to measure rotation rates and separation rates for multiple objects.

• Research Organization: Environmental Research Inst. of Michigan, Ann Arbor, MI (USA)
• OSTI ID: 7166289
• Report Number(s): AD-A-214243/8/XAB; ERIM--201600-11-F-VOL-1
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450500* -- Military Technology
Weaponry
& National Defense-- Strategic Defense Initiative-- (1990-)
ALGORITHMS
BALLISTIC MISSILE DEFENSE
COMPUTERIZED SIMULATION
CONTROL SYSTEMS
CORRELATIONS
DISCRIMINATORS
DOCUMENT TYPES
ELECTRONIC CIRCUITS
FOURIER ANALYSIS
IMAGES
ITERATIVE METHODS
LASERS
MATHEMATICAL LOGIC
NATIONAL DEFENSE
PROGRESS REPORT
RESOLUTION
SIMULATION
SPACE WEAPONS