Accession Number : AD0640262

Title :   RADAR HOLOGRAMS,

Corporate Author : NAVAL ORDNANCE LAB CORONA CALIF

Personal Author(s) : Conger,Robert L. ; Long,Leslie T. ; Parks,John A.

Report Date : 30 SEP 1966

Pagination or Media Count : 21

Abstract : Optical experiments and mathematical analysis of radar patterns have shown that radar holograms which are not affected by vibration can be obtained by the following method: (1) A scanning radar receiver--possibly airborne--or an array of such receivers is used to produce a map that shows the intensities of radar signals; (2) a pattern of concentric black and white bands is developed--possibly by a computer--in which the width of each band is proportional to the cube root of its respective radar signal intensity; (3) the photographically reduced pattern is made into a transparency which is the hologram; and (4) the hologram is illuminated by coherent light to provide images of the objects that caused the original radar signal distribution. This method produces holograms which are superior to Fresnel holograms, in that vibration is not a factor and, because exact gray scales are not required, to Fraunhofer holograms. (Author)

Descriptors :   (*RADAR EQUIPMENT, *DISPLAY SYSTEMS), (*STEREOSCOPIC DISPLAY SYSTEMS, RADAR EQUIPMENT), (*LASERS, STEREOSCOPIC DISPLAY SYSTEMS), OPTICAL IMAGES, RADAR SIGNALS, PHOTOGRAPHIC IMAGES, DIFFRACTION, INTEGRALS, INTERFEROMETERS

Subject Categories : Lasers and Masers
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE