RADAR HOLOGRAMS,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1966
- Accession Number
- AD0640262
Entities
People
- John A. Parks
- Leslie T. Long
- Robert L. Conger
Organizations
- Naval Ordnance Laboratory