Accession Number : ADD018680

Title :   Method for Detecting Acoustic Signals from an Underwater Source

Descriptive Note : Patent, Filed 9 Jul 96, patented 16 Sep 97

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Quazi, Azizul H

Report Date : 16 Sep 1997

Pagination or Media Count : 5

Abstract : A method for detecting radiated and reflected acoustic signals from an underwater source, wherein the acoustic signals are present in a random noise environment and form an output therewith. The method includes the steps of operating an entropy based acoustic receiver to receive the output, calculating the entropy of the received output, and comparing the calculated entropy with a selected entropy threshold value. A substantial difference is indicative of the presence of an acoustic signal from an underwater source. A less than substantial difference is indicative of a lack of presence of an acoustic signal from an underwater source.

Descriptors :   *PATENT APPLICATIONS, *ACOUSTIC DETECTORS, THRESHOLD EFFECTS, ACOUSTIC SIGNALS, ADAPTIVE FILTERS, RADIATED NOISE, ACOUSTIC REFLECTION, UNDERWATER SOUND SIGNALS

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE