Detection and localization of target in shallow water in the framework of the acoustic barrier problem at the laboratory scale
type: Dataset
description: This thesis demonstrates experimentally at the laboratory scale the detection and localization, in transmission, of a wavelength-sized target in a shallow ultrasonic waveguide between two source-receiver arrays in the framework of the acoustic barrier problem. Two coplanar arrays record in the time-domain the transfer matrix of the waveguide between each pair of source-receiver transducers. Invoking the reciprocity principle, a time-domain double-beam-forming algorithm is simultaneously performed on the source and receiver arrays. This array processing projects the multireverberated acoustic echoes into an equivalent set of eigenray, which are defined by their launch and arrival angles. Comparison is made between the amplitude of each eigenray without and with a target for detection in the waveguide. Localization is performed though inversion problem using all of the eigenrays extracted from double beamforming. The use of the diffraction-based sensitivity kernel for each eigenray provides both the localization and the signature of the target. Experimental results are shown in the presence of surface waves. The use of the acoustical feedback in frame of the acoustic barrier problem is also considered, for its extreme sensibility to medium variation.
identifier: NNT: 2011GRENU032
issued: 2026-05-24T08:17:46.751603
language: fr
modified: 2026-05-24T08:17:46.751608
contact point: Organization
  fn: CCSD
keyword: acoustic-feedback
keyword: array-processing
keyword: detection
keyword: effet-larsen
keyword: experiences-petite-echelle
keyword: infoeu-reposemanticsdoctoralthesis
keyword: localisation
keyword: localization
keyword: noyau-de-sensibilite
keyword: sdustusciences-of-the-universe-physicsearth-sciences
keyword: sensitivity-kernel
keyword: small-scale-experiments
keyword: theses
keyword: traitement-dantenne
landing page: https://theses.hal.science/tel-00680103

Detection and localization of target in shallow water in the framework of the acoustic barrier problem at the laboratory scale
type: Distribution
format: HTML
issued: 2026-05-24T08:17:46.842461
modified: 2026-05-24T08:17:46.706966
access URL: https://theses.hal.science/tel-00680103

test_moissonnage_selune
type: Agent