NDLI: Real-time localization of multiple acoustic transponders using a towed interrogation transducer

Content Provider	IEEE Xplore Digital Library
Author	Osler, J. Beer, J.
Copyright Year	2000
Description	Author affiliation: Defence Res. Establ. Atlantic, Dartmouth, NS, Canada (Osler, J.)
Abstract	A technique has been developed to determine the geographic position and depth of acoustic transponders or releases that are fixed to bottom-moored oceanographic instruments. An interrogation transducer, operating at 10 kHz, is towed by the research vessel. It receives slant range information from the individual transponders, at distinct frequencies from 9 to 12 kHz. The interrogation command unit is controlled remotely by software written in the G programming language (LabVIEW/sup TM/). Slant range to the acoustic transponders and the geographic position of the interrogation transducer are then used in real-time or playback modes to localize the acoustic transponders. Two localization techniques have been developed and compared. The first is an exhaustive grid search that compares the measured slant range with the slant range calculated from the center of each grid cell to the position of the interrogation transducer. The second is a minimization of a function-the summed squared deviation between known interrogator positions and estimated transponder positions using the Levenberg-Marquardt technique. This objective function is approximated by a linear function of the parameters to be determined (geographic position, depth, and sound speed). In both cases, the estimated position of each transponder is revised as each additional slant range measurement is introduced. To improve the depth estimate, slant range data can be filtered and weighted to remove outliers and to emphasize shorter slant ranges (steeper grazing angles). A simulation program has been written to compare different search patterns, in particular, the rate they converge to stable estimates of the position and the error associated with these estimates.
Starting Page	725
Ending Page	732
File Size	1274609
Page Count	8
File Format	PDF
ISBN	0780365518
DOI	10.1109/OCEANS.2000.881338
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transponders Acoustic transducers Position measurement Acoustic measurements Sea measurements Shape measurement Instruments Frequency Computer languages Linear approximation
Content Type	Text
Resource Type	Article

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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
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