Computer-Assisted Naval Applications of Holography.
COMPUTER COMMAND AND CONTROL CO WASHINGTON D C
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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