NDLI: Improvement of synthetic aperture sonar with multi-channel projector

Content Provider	IEEE Xplore Digital Library
Author	Sawa, Takao Kasaya, Takafumi Nakatsuka, Kunihiko Tanaka, Nobuhiro Furushima, Yasuo
Copyright Year	2015
Description	Author affiliation: R&D Center for Submarine Resources, JAMSTEC, Yokosuka, JAPAN (Furushima, Yasuo) \|\| R&D Center for Earthquake and Tsunami, JAMSTEC, Yokosuka, JAPAN (Kasaya, Takafumi) \|\| Aiichi Industry Co., Ltd, Saitama, JAPAN (Tanaka, Nobuhiro) \|\| Marine Technology Center, JAMSTEC, Yokosuka, JAPAN (Sawa, Takao) \|\| Hardware Development Division, SAS Co., Ltd, Tokyo, JAPAN (Nakatsuka, Kunihiko)
Abstract	A synthetic aperture sonar gathers echoes from large area of seafloor per a ping, therefore the sonar needs wider width of the beam than Side scan sonar. But if the elements of the projector is just one element, it have to be small to widen the beam, and must be low sensitivity. One solutions to raise the sensitivity of the sonar is to use array as a receiver. The array is not only necessary for high sensitivity, but also the motion compensation and higher mapping rate in synthetic aperture process. Many synthetic aperture sonar are now constructed with a single transmitter with an arrayed receiver. But the projector remains small and single in many synthetic aperture sonars. The maximum detection range of synthetic aperture sonar was no longer than side scan sonar at same sonic frequency yet. To extend the sonar range, we proposed multi-channel projector whose elements lined vertically. We consider that the intensity of the projection beam increases keeping its width, by controlling a timing of the projection from each element. In addition, if the projector can receive echoes, 3D-maps can be generated simultaneously like a multi-beam echo sounder. This means synthesizing aperture process become more precise with the correct altitudes. In June 2014, we carried out survey with the synthetic aperture sonar totally for 40 hours over 5 days at off-Sanriku near border of Miyagi and Iwate prefecture. We evaluated the projector performance through detections of many artificial objects such as underwater reefs and sunken ship in the survey. We confirmed that projection beam was widen keeping projection power and maximum detection range was over 400 m in slant range. In addition, bottom detection process which is before step of 3D-mapping became easy.
Starting Page	1
Ending Page	6
File Size	2184947
Page Count	6
File Format	PDF
ISBN	9780933957435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Synthetic aperture sonar Acoustic beams Arrays Apertures Receivers Marine vehicles google earth synthetic aperture sonar beam forming
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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