Accession Number : AD0758087

Title :   An Application of Ray Theory to the Identification of Long-Range Multipaths,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : Powers,M. R. ; Thorp,W. H.

Report Date : 24 FEB 1961

Pagination or Media Count : 11

Abstract : Techniques for the identification of multipaths received at long range during the prosecution of Project POSAC are discussed in terms of Ray Theory. Bottom-reflected arrivals are readily treated by a procedure employing a greatly simplified model of the ocean. Refracted propagation pertinent to these tests is explained as an interchange of energy between the SOFAR channel and an overlying shallow duct, while certain restrictions formerly credited to this mechanism are found to be unnecessary. In comparing the observed refracted data with the results of a Datatron ray-tracing program, the agreement is greatly improved by the use of recent NOL sound velocity tables. (Author)

Descriptors :   (*SONAR SIGNALS, IDENTIFICATION), (*UNDERWATER SOUND, MULTIPATH TRANSMISSION), SOUND TRANSMISSION, REFLECTION, PROPAGATION

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE