NDLI: Measurements of underwater electromagnetic wave propagation

Content Provider	IEEE Xplore Digital Library
Author	Yoshida, H. Iwakiri, N. Fukuda, T. Deguchi, M. Onogi, S.
Copyright Year	2015
Description	Author affiliation: Kumamoto Univ., Kumamoto, Japan (Onogi, S.) \|\| Nat. Inst. of Inf. & Commun. Technol. (NICT), Koganei, Japan (Iwakiri, N.) \|\| Japan Agency for Marine-Earth Sci. & Technol. (JAMSTEC), Yokosuka, Japan (Yoshida, H.; Fukuda, T.; Deguchi, M.)
Abstract	Acoustic wave is major medium for underwater communications, positioning, and telemetry. We have no alternative to acoustic wave in long range applications in spite of a few drawbacks which are multipath fading, narrow bandwidth, and susceptibility to propagation characteristics from back ground media. Applications of underwater electromagnetic wave (EMW) in range of hundreds meters have been studied for half a century but now some short range low frequency underwater modems have only been commercialized. If high frequency EMW can propagate through sea-water with low damping, it would compensate for shortcomings of acoustic wave. The previous conference we reported some amazing results that attenuation of electromagnetic wave measured in sea-water would be smaller than that of theoretically estimated from Maxwell's equations assumed an isotropic and homogenous medium. One of this result was obtained by using a Faraday cage filled by tap water and sea water in frequency range around 40 MHz. To verify these results we have developed new small loop antennae which has buffer layer made from tap water. We carried out a test measurement with the antennae at a pier. The obtained results were also hard to understand but there might be measurement errors. In November 2014, we started to design of a new complete measurement system for underwater EMW propagation utilizing channel sounding technique to avoid measurement errors. In the conference, the design concept of the new measurement system will be presented in addition to some test results obtained with the new antennae.
Starting Page	1
Ending Page	5
File Size	1381415
Page Count	5
File Format	PDF
e-ISBN	9781479983001
DOI	10.1109/UT.2015.7108274
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-02-23
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antenna measurements Sea measurements Acoustic measurements Optical variables measurement Acoustics Copper Resonant frequency
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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