Computer-Assisted Naval Applications of Holography.
Abstract
An initial study was made of the feasibility of Naval applications of computer-assisted holography. Reviews were made both of the limiting fundamentals, in general, and of the natural and technological constraints that exist, notably medium attenuation, in connection specifically with km.-range underwater acoustic and atmospheric mm.-wave holography. In both, relative receiver-object motion, excessive array dimensions, and sensor signal noise ratios are the limiting factors. A retro-reflector attached to a cooperative target will largely eliminate relative motion effects; this scheme has, in principle, been anticipated in the literature. Relevant computer operations were examined; the present art enables complete constructions or reconstructions in about one second. A computer technique was conceived which, in principle, eliminates the distortions stemming from changes in wavelength between hologram construction and object wavefront reconstruction at display time. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 13, 1970
- Accession Number
- AD0869245
Entities
People
- Herman H. Lowell
- Nabil Farhat
- Samuel Musa