Accession Number : ADA598902


Title :   Acoustic Coherent Backscatter Enhancement from Aggregations of Point Scatterers


Descriptive Note : Annual rept.


Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Dowling, David R


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA598902


Report Date : 30 Sep 2013


Pagination or Media Count : 8


Abstract : 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 two years, this project has focused on simulations of acoustic multiple scattering from 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 type, 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.


Descriptors :   *ACOUSTIC SCATTERING , *BACKSCATTERING , *NUMERICAL METHODS AND PROCEDURES , *SONAR , ACOUSTIC ARRAYS , AMPLITUDE , OCEAN ENVIRONMENTS , TIME DEPENDENCE , WAVEGUIDES , WIDTH


Subject Categories : Physical and Dynamic Oceanography
      Numerical Mathematics
      Acoustic Detection and Detectors
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE