NDLI: Circular synthetic aperture sonar design

Content Provider	IEEE Xplore Digital Library
Author	Friedman, A.D. Mitchell, S.K. Kooij, T.L. Scarbrough, K.N.
Copyright Year	2005
Description	Author affiliation: Solers, Inc., Arlington, VA, USA (Friedman, A.D.)
Abstract	Medical imaging enjoys a reputation of applying multi-aspect sensing to construct internal maps of patients. The CAT scan evokes a concept of an X-ray probe moving around the patient; the multi-aspect data is processed to construct images of the areas of interest. In contrast, advanced acoustic imaging of objects on the ocean floor has to date relied only on high resolution sensing from limited aspect angles using data gathered on straight-line trajectories. With the increased application of UUVs, it is fitting to consider the factors that govern the design of sonar that can reconstruct images taking advantage of data with aspect diversity. One future paradigm will be circular synthetic aperture sonar (CSAS) using tomographic methods to reconstruct scenes of interest from data obtained over a full circular aperture. This presentation will address the parameters and procedures that play a role in CSAS and the relations between them that govern the performance of such a system. The design of a CSAS for high resolution surveillance of objects on the ocean bottom depends on parameters such as the diameter of the circular trajectory, the speed of the platform, the size of the imaged circle, and the ping repetition rate. The spatial and range resolutions are functions of the sonar signal wavelength and its bandwidth. These parameters define in turn the maximum allowable uncorrectable platform position errors, which lead to defining the requirements of the hypernavigation system that is needed to correct for the errors between the actual ping and receiver positions and the ideal sonar trajectory used in the main imaging computation. A possible realization of such a navigation system is described in the presentation. The ping repetition rate requirements are determined by the largest dimension and shape of the reflecting areas to be imaged. Analytical expressions relating all of the above mentioned design parameters are derived. These relationships define various performance metrics as functions of the deployment parameters, allowing optimization of search strategies to maximize area coverage rate for a choice of multiple circle patterns. Images of several objects using data from a turntable testbed at Lake Travis Test Station of the Applied Research Laboratories of the University of Texas at Austin will be shown and discussed in relation to the design and test parameters.
Starting Page	1038
Ending Page	1045
File Size	1297833
Page Count	8
File Format	PDF
ISBN	0780391039
DOI	10.1109/OCEANSE.2005.1513201
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Synthetic aperture sonar Testing Oceans Image resolution Image reconstruction Spatial resolution Signal resolution Error correction Sonar navigation Biomedical imaging
Content Type	Text
Resource Type	Article

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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