Broadband synthetic aperture geoacoustic inversion

TitleBroadband synthetic aperture geoacoustic inversion
Publication TypeJournal Article
Year of Publication2013
AuthorsTan B.A, Gerstoft P, Yardim C, Hodgkiss WS
JournalJournal of the Acoustical Society of America
Date Published2013/07
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000321908500052
Keywordsfield; impulse-response; receiver; shallow-water; ship noise; single hydrophone; source localization; uncertainty; underwater acoustics inversion; wave-guide

A typical geoacoustic inversion procedure involves powerful source transmissions received on a large-aperture receiver array. A more practical approach is to use a single moving source and/or receiver in a low signal to noise ratio (SNR) setting. This paper uses single-receiver, broadband, frequency coherent matched-field inversion and exploits coherently repeated transmissions to improve estimation of the geoacoustic parameters. The long observation time creates a synthetic aperture due to relative source-receiver motion. This approach is illustrated by studying the transmission of multiple linear frequency modulated (LFM) pulses which results in a multi-tonal comb spectrum that is Doppler sensitive. To correlate well with the measured field across a receiver trajectory and to incorporate transmission from a source trajectory, waveguide Doppler and normal mode theory is applied. The method is demonstrated with low SNR, 100-900 Hz LFM pulse data from the Shallow Water 2006 experiment. (C) 2013 Acoustical Society of America.

Integrated Research Themes: 
Student Publication: