Acoustic Coherent Backscatter Enhancement from Aggregations of Point Scatterers.

摘要

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 three years, this project has focused on simulations of acoustic multiple scattering from two- and now three-dimensional aggregations of omni-directional point scatterers to determine the parametric realms in which ACBE might be observed, and its characteristics when it is observed. The detailed objectives of the current research effort are to determine the parametric dependence of ACBE peak amplitude, peak emergence rate as the number of observations increases, peak angular width, and peak time dependence. Here the independent parameters are the range between the scattering aggregation and the receiving array, the receiving array characteristics, incident wave characteristics (wave front shape, waveform, frequency, bandwidth, duration), and aggregation characteristics (scatterer cross section and mean spacing, overall aggregation size and shape, etc.). Eventually, underwater waveguide characteristics will be considered as well.