Ocean acoustic tomography based on peak arrivals

Skarsoulis, EK; Athanassoulis, GA; Send, U

dc.contributor.author	Skarsoulis, EK	en
dc.contributor.author	Athanassoulis, GA	en
dc.contributor.author	Send, U	en
dc.date.accessioned	2014-03-01T01:12:08Z
dc.date.available	2014-03-01T01:12:08Z
dc.date.issued	1996	en
dc.identifier.issn	0001-4966	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11968
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0030427808&partnerID=40&md5=5216ca2d4b7da4efbc23b6a7ecfeeafe	en
dc.subject.classification	Acoustics	en
dc.subject.other	acoustics	en
dc.subject.other	article	en
dc.subject.other	data analysis	en
dc.subject.other	experimental model	en
dc.subject.other	oceanic regions	en
dc.subject.other	priority journal	en
dc.subject.other	signal noise ratio	en
dc.subject.other	statistical analysis	en
dc.subject.other	tomography	en
dc.subject.other	acoustic tomography	en
dc.subject.other	peak arrivals	en
dc.title	Ocean acoustic tomography based on peak arrivals	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1996	en
heal.abstract	The recently introduced notion of peak arrivals [Athanassoulis and Skarsoulis, J. Acoust. Sec. Am. 97, 3575-3588 (1995)], defined as the significant local maxima of the arrival pattern, is studied here as a modeling basis for performing ocean tomography. Peak arrivals constitute direct theoretical counterparts of experimentally observed peaks, and offer a complete modeling of experimental observables, even in cases where ray or modal arrivals cannot be resolved. The coefficients of the resulting peak-inversion system, relating travel-time with sound-speed perturbations, are explicitly calculated in the case of range-independent environments using normal-mode theory. To apply the peak-inversion scheme to tomography the peak identification and tracking problem is examined from a statistical viewpoint; maximum-likelihood and least-square solutions are derived and discussed. The particular approach adopted treats the identification and tracking problem in close relation to the inversion procedure; all possibilities of associating observed peaks with background arrivals are examined via trial inversions, and the best peak identification is selected with respect to a least-square criterion. The feasibility of peak tomography is subsequently demonstrated using first synthetic data and then measured data from the THETIS-I experiment. In the synthetic case the performance of the overall scheme is found to be satisfactory both with noise-free and noisy data. Furthermore, the identification, tracking, and inversion results using experimental acoustic data from THETIS-I are in good agreement with independent held observations. (C) 1996 Acoustical Society of America.	en
heal.publisher	AMER INST PHYSICS	en
heal.journalName	Journal of the Acoustical Society of America	en
dc.identifier.isi	ISI:A1996VB16600012	en
dc.identifier.volume	100	en
dc.identifier.issue	2 I	en
dc.identifier.spage	797	en
dc.identifier.epage	813	en