Acoustic Coherent Backscatter Enhancement from Aggregations of Marine Animals.

摘要

LONG-TERM GOALS: The overall long-term goal for this project is to determine if and how acoustic coherent backscatter enhancement (ACBE) can be used for classification of active sonar returns in a wide variety of ocean environments. During its first eight months, this project has focused on elementary simulations of acoustic multiple scattering from aggregations of omni-directional scatterers to determine the parametric realms in which ACBE might be observed. OBJECTIVES: The detailed objectives of the current research effort are to determine the parametric dependence of ACBE peak amplitude, peak emergence rate, peak angular width, and peak time dependence. Here the independent parameters are source-scatterer range, receiving array characteristics, incident wave characteristics (wave type, waveform, frequency, bandwidth, duration), and aggregation characteristics (scatterer cross section, mean spacing, resonant frequency, overall size, etc.). Eventually, underwater waveguide characteristics will be considered as well.