NDLI: Tow vehicle depth verification

Content Provider	IEEE Xplore Digital Library
Author	Harris, M.M. Avera, W.E. Bibee, L.D.
Copyright Year	2002
Description	Author affiliation: Naval Res. Lab., Stennis Space Center, MS, USA (Harris, M.M.; Avera, W.E.; Bibee, L.D.)
Abstract	NRL demonstrated extraction of accurate single beam and multibeam bathymetry from a towed vehicle designed to locate mines in the water column. However, biases were encountered in measuring the static pressure depth of the moving vehicle. Water depth is calculated by simply adding tow vehicle depth, measured by a pressure sensor, to the multibeam ranges from the seafloor, measured acoustically from the vehicle. Comparisons of the tow vehicle bathymetry with ground truth showed a shallow bias in depth. The pressure sensor was suspected based on previous experience measuring multibeam bathymetry on the unmanned semi submersible ORCA. There were two contributing sources of error. The first was pressure sensor calibration; the sensor needs to be "zeroed" before entering the water. The second and more interesting was that the sensor was measuring variations in pressure caused from vehicle velocity in addition to changes in vehicle depth. The challenge is measuring static depth from a moving vehicle. The acoustic signal from the first water surface bounce was used to measure the bias and correct for pressure sensor error. This paper describes the sensors, data and techniques used to compensate for the depth bias.
Starting Page	1199
Ending Page	1202
File Size	288409
Page Count	4
File Format	PDF
ISBN	0780375343
DOI	10.1109/OCEANS.2002.1192137
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic measurements Acoustic sensors Pressure measurement Marine vehicles Acoustic beams Sea floor Land vehicles Road vehicles Underwater vehicles Calibration
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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