Pesca Pubblicazione scientifica Frequency Invariant Beamformers for Underwater Sound FILONE TECNOLOGICO TEMA economia circolare e sostenibilità RIASSUNTO The increasingly widespread use of broadband acoustic signals for underwater communications, sonars for survey work and fisheries research incentivises the design of beamformers with frequency-invariant beampatterns to minimise angular variations of the signal spectral content and angular width of the beam with frequency. In this paper, we present a technique for frequency invariant beam generation using a delay and sum procedures for linear and 2D arrays with half-wavelength element spacing at the highest frequency of interest and a transformation of this approach into a 3D array topology. DATA Data di pubblicazione: 01/10/2019 AUTORI EUGENE STYTSENKO MARK POLETTI MARCO MEIJER NEIL SCOTT ENTE DI AFFERENZA CALLAGHAN INNOVATIONLOWER HUTTNEW ZEALAND RIVISTA OCEANS 2019 MTS/IEEE SEATTLE (Page(s): 1-9)