Accession Number : ADA331756

Title :   Optimal Ocean Acoustic Tomography and Navigation With Moving Sources

Descriptive Note : Doctoral thesis

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING

Personal Author(s) : Deffenbaugh, Max

PDF Url : ADA331756

Report Date : JUN 1997

Pagination or Media Count : 157

Abstract : Ocean Acoustic Tomography inverts for the two- or three-dimensional sound speed structure in a volume of water by measuring acoustic travel times along ray paths traversing the volume. The sensitivity of the acoustic travel times to particular modes of sound speed variation is highly dependent on the source and receiver positions. Autonomous underwater vehicles provide mobile instrument platforms at relatively low cost. Tomography sources mounted on AUVs can be adaptively repositioned to better image emerging sound speed features. The goal of optimal moving source tomography is to make optimal use of mobile controllable tomography sources in gaining information about the environment. The component technologies for optimal moving source tomography are position estimation, sound speed parameterization and estimation, ray path identification, and vehicle path optimization. This thesis makes contributions in each of these areas.

Descriptors :   *TOMOGRAPHY, *ACOUSTIC VELOCITY, ALGORITHMS, OPTIMIZATION, UNDERWATER VEHICLES, THESES, SOUND TRANSMISSION, ACOUSTIC MEASUREMENT, ACOUSTIC SIGNALS, RAY TRACING, UNDERWATER ACOUSTICS, OCEAN ENVIRONMENTS, TRAVEL TIME.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE