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Titolo:
Detection and selective focusing on scatterers using decomposition of timereversal operator method in Pekeris waveguide model
Autore:
Yokoyama, T; Kikuchi, T; Tsuchiya, T; Hasegawa, A;
Indirizzi:
Natl Def Acad, Dept Earth & Ocean Sci, Yokosuka, Kanagawa 2398686, Japan Natl Def Acad Yokosuka Kanagawa Japan 2398686 ka, Kanagawa 2398686, Japan Japan Marine Sci & Technol Ctr, Kanagawa 2370061, Japan Japan Marine Sci &Technol Ctr Kanagawa Japan 2370061 awa 2370061, Japan
Titolo Testata:
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
fascicolo: 5B, volume: 40, anno: 2001,
pagine: 3822 - 3828
SICI:
0021-4922(200105)40:5B<3822:DASFOS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-CONJUGATION; MIRROR;
Keywords:
phase-conjugate mirror; time reversal mirror; Pekeris wave guide; DORT method; underwater acoustics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
6
Recensione:
Indirizzi per estratti:
Indirizzo: Yokoyama, T Natl Def Acad, Dept Earth & Ocean Sci, Yokosuka, Kanagawa 2398686, Japan Natl Def Acad Yokosuka Kanagawa Japan 2398686 2398686, Japan
Citazione:
T. Yokoyama et al., "Detection and selective focusing on scatterers using decomposition of timereversal operator method in Pekeris waveguide model", JPN J A P 1, 40(5B), 2001, pp. 3822-3828

Abstract

The decomposition of the time reversal operator (DORT) method is a selective detection and focusing technique for the pulse-echo mode that uses an array of transmit-receive transducers. Because it is an application of the acoustic time reversal mirror. the irregular shape of the array and the aberration of the propagation medium are compensated and the selective focusing on targets is made possible. In this paper, we examined the application of this method to the underwater acoustics and the application to active sonarand communication are made possible. To clarify the relationship between the focusing effect of the DORT method and the sound propagation property inshallow water. we examined the selective focusing effect with respect to the propagation distance by using the cylindrical spread model without the sea surface and bottom and the Pekeris model, which is typical of shallow water models. There are few influences of the propagation distance on the focusing effect in shallow water model as a result, and it is shown that the focusing effect improves with the increase of the sound velocity of the bottom.

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Documento generato il 19/09/20 alle ore 09:26:02