NDLI: The Impact of the Temporal Variability of Seafloor Roughness on Synthetic Aperture Sonar Repeat

Content Provider	IEEE Xplore Digital Library
Author	Lyons, A.P. Brown, D.C.
Copyright Year	1976
Abstract	In this paper, we review past work and present new analysis of the temporal variability of seafloor roughness and how this variability impacts synthetic aperture sonar (SAS) repeat-pass interferometry. The new work presented here uses a model based on first-order perturbation theory for acoustic interface scattering to link the complex coherence of SAS images taken at different times to the decorrelation of seafloor-roughness spectral estimates. Results are assessed through a comparison of decorrelation values generated by processing seafloor roughness data recorded by a digital photogrammetry system and complex SAS image data acquired with a translating source/receiver rail assembly. These data sets were collected on sandy seafloors off the western coast of Florida as part of the U.S. Office of Naval Research (ONR)-sponsored 2004 Sediment Acoustics Experiment (SAX04). Our results show that the diffusion model for changes in sediment roughness developed previously [ D. R. Jackson , IEEE J. Ocean. Eng., vol. 34, no. 4, pp. 407-422, Oct. 2009] provides an excellent fit to our data over a large range of spatial frequencies. In both the past work and new analysis, decorrelation was found to be frequency dependent with e-folding times (i.e., decay constants) of hours to days, setting a limit on reasonable time frames for successful repeat-pass coherent change detection.
Sponsorship	IEEE Oceanic Engineering Society
Starting Page	91
Ending Page	97
Page Count	7
File Size	2992568
File Format	PDF
ISSN	03649059
Volume Number	38
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Synthetic aperture sonar Decorrelation Correlation Acoustics Coherence Sediments Acoustic measurements temporal decorrelation Acoustic scattering coherent change detection repeat–pass interferometry synthetic aperture sonar (SAS)
Content Type	Text
Resource Type	Article
Subject	Ocean Engineering Mechanical Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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