title: Time-reversal multiple signal classification in case of noise: a phase-coherent approach.
abstract: The problem of locating point-like targets beyond the classical resolution limit is revisited. Although time-reversal MUltiple SIgnal Classification (MUSIC) is known for its super-resolution ability in localization of point scatterers, in the presence of noise this super-resolution property will easily break down. In this paper a phase-coherent version of time-reversal MUSIC is proposed, which can overcome this fundamental limit. The algorithm has been tested employing synthetic multiple scattering data based on the Foldy-Lax model, as well as experimental ultrasound data  acquired in a water tank. Using a limited frequency band, it was demonstrated that the phase-coherent MUSIC algorithm has the potential of giving significantly better resolved scatterer locations than standard time-reversal MUSIC.
authors.affiliation: Centre for Imaging, Department of Informatics, University of Oslo, P.O. Box 1080 Blindern No-0316 Oslo, Norway. endriasa@ifi.uio.no
authors.forename: Endrias G
authors.initials: EG
authors.lastname: Asgedom
authors.forename: Leiv-J
authors.initials: LJ
authors.lastname: Gelius
authors.forename: Andreas
authors.initials: A
authors.lastname: Austeng
authors.forename: Sverre
authors.initials: S
authors.lastname: Holm
authors.forename: Martin
authors.initials: M
authors.lastname: Tygel
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D008962:Models, Theoretical; D009010:Monte Carlo Method; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014465:Ultrasonics / Q000379:methods*