Accession Number : AD0780443

Title :   Studies of Monochromatic, Quasi-Monochromatic and Broadband Imaging Techniques,

Corporate Author : TECHNOLOGY SERVICE CORP SILVER SPRING MD

Personal Author(s) : Rees,F. L. ; Palmer,L. B. ; Brooks,L. W.

Report Date : 18 MAR 1974

Pagination or Media Count : 78

Abstract : Passive imaging techniques are considered for the entire range of acoustic signal classes. Methods are developed for imaging of monochromatic point-sources, linear distributions of quasi-monochromatic sources (deterministic carrier-frequency with slow and random fluctuations of amplitude and phase), and broadband sources. Imaging of a monochromatic point-source is performed by 'focusing' a synthetic aperture on the radiator. However, this technique is not applicable for wider classes of signals. Thus a power cross-covariance measure of field points is used to image quasi-monochromatic sources. To image broadband sources, it is to show that real apertures must be considered. A subsequent report will provide a unifying theory of passive imaging in the form of a generalized imaging integral. (Author)

Descriptors :   *Acoustic detection, *Optical images, *Image processing, Passive systems, Bodies of revolution, Geometric forms, Integrals, Underwater sound

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE