Title :
Feasibility of passive oceanic acoustic tomography: a Cramer Rao bounds approach
Author :
Gaucher, D. ; Gervaise, C.
Author_Institution :
Lab. E/sup 3/I/sup 2/, ENSIETA, Brest, France
Abstract :
This paper completes the proof of the feasibility of passive ocean acoustic tomography (OAT) by using the Cramer Rao bounds (CRB) tool. CRB are calculated on a shallow environment modeled by a homogeneous layer over a semi infinite sediment layer. The results are that considering relative delays instead of absolute delays degrades the estimation of ocean parameters. Taking into account the spatial structure (angles of arrival) enables one to improve performances of passive OAT and have similar performances as soon as accuracy of physical parameter estimations are conserved than active OAT for absolute delays only.
Keywords :
acoustic tomography; bathymetry; oceanographic techniques; sediments; underwater sound; Cramer Rao bounds approach; absolute delays; angles of arrival; homogeneous layer; ocean parameters estimation; passive oceanic acoustic tomography; relative delays; semiinfinite sediment layer; Acoustic emission; Acoustic measurements; Acoustic noise; Cramer-Rao bounds; Delay estimation; Oceans; Parameter estimation; Sea measurements; Sea surface; Tomography;
Conference_Titel :
OCEANS 2003. Proceedings
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-933957-30-0
DOI :
10.1109/OCEANS.2003.178345
