Accession Number : ADD017281

Title :   Inverse Tomography by Matched Field Processing.

Descriptive Note : Patent, Filed 24 Sep 91, patented 11 Oct 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tolstoy, Alexandra I ; Diachok, Orest I ; Frazer, L N

Report Date : 24 Sep 1991

Pagination or Media Count : 20

Abstract : To determine the speed of propagation of a signal in a medium, wave amplitude is measured over time at one or more detectors disposed within the medium so as to detect and identify signals transmitted at one or more sources disposed within said region. Frequency domain matched field processing power is calculated by matching measured with perturbation normal mode model fields, and beta coefficients which determine sound speed profiles are calculated by beta backpropagation so as to maximize the matched field processing power. (AN)

Descriptors :   *TOMOGRAPHY, *ACOUSTIC VELOCITY, *PATENTS, VELOCITY, SIGNAL PROCESSING, COMPUTATIONS, PROFILES, WAVE PROPAGATION, ACOUSTIC SIGNALS, INVERSION, HYDROPHONES, WAVE FUNCTIONS, AMPLITUDE, UNDERWATER ACOUSTICS, SOUND PRESSURE, SONAR, ACOUSTIC FIELDS, SOUND RANGING

Subject Categories : Acoustics
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE