title: Analysis and classification of broadband echoes using bio-inspired dolphin pulses.
abstract: To date most sonars use narrow band pulses and often only the echo envelope is used for object detection and classification. This paper considers the advantages afforded by bio-inspired sonar for object identification and classification through the analysis and the understanding of the broadband echo structure. Using the biomimetic dolphin based sonar system in conjunction with bio-inspired pulses developed from observations of bottlenose dolphins performing object identification tasks, results are presented from experiments carried out in a wave tank and harbor. In these experiments responses of various targets to two different bio-inspired signals are measured and analyzed. The differences in response demonstrate the strong dependency between signal design and echo interpretation. In the simulations and empirical data, the resonance phenomena of these targets cause strong notches and peaks in the echo spectra. With precision in the localization of these peaks and dips of around 1 kHz, the locations are very stable for broadside insonification of the targets and they can be used as features for classification. This leads to the proposal of a broadband classifier which operates by extracting the notch positions in the target echo spectra.
authors.affiliation: Oceans Systems Laboratory, School of EPS, Heriot-Watt University, Edinburgh, Scotland EH14 4AS, United Kingdom.
authors.forename: Yan
authors.initials: Y
authors.lastname: Pailhas
authors.forename: Chris
authors.initials: C
authors.lastname: Capus
authors.forename: Keith
authors.initials: K
authors.lastname: Brown
authors.forename: Patrick
authors.initials: P
authors.lastname: Moore
mesh_terms: D000162:Acoustics; D000465:Algorithms; D000818:Animals; D050681:Bottle-Nosed Dolphin; D003198:Computer Simulation; D004455:Echolocation; D004777:Environment; D008954:Models, Biological; D046709:Pattern Recognition, Physiological; D012815:Signal Processing, Computer-Assisted; D014867:Water
chemical_list: D014867:Water