Experimental demonstration of time warping to invert for array tilt and mode shape on a vertical array in a shallow arctic environment

• Main Authors: Thode, Aaron M, Bonnel, Julien
• Other Authors: Scripps Institution of Oceanography (SIO - UC San Diego), University of California San Diego (UC San Diego), University of California (UC)-University of California (UC), Lab-STICC_ENSTAB_CID_TOMS, Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom Paris (IMT)-Centre National de la Recherche Scientifique (CNRS)-Université européenne de Bretagne - European University of Brittany (UEB)-École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Télécom Bretagne-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Institut Mines-Télécom Paris (IMT)-Centre National de la Recherche Scientifique (CNRS)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2015
• Subjects: underwater acoustics; array processing; [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph]; Arctic; Genova; Sturm; bowhead whale
• Online Access: https://hal.science/hal-01169956

International audience Vertical arrays provide the most convenientgeometry for many underwater passive acoustic applications thatrequire the identification and isolating of propagating normalmodes. Unfortunately, practical deployments of vertical arraysface several practical issues, including the need to compensate forvertical array inclination, and incomplete coverage of the watercolumn that makes the use of Sturm-Liouville orthogonalityproblematic. Here bowhead whale signals collected in the ArcticOcean are used to demonstrate how the use of non-linearsampling (called “warping”) in the time domain can be used todirectly invert for array tilt, as well as yield mode shapes,without resort to the orthogonality relations.