Spatio-Temporal Characterization of Bio-Acoustic Scatterers in Complex Media
Abstract
Characterization of biologically-induced ocean reverberation features is key to effectively parametrize acoustic models and thus ultimately improve the detection performance of long-range SONAR systems. In particular, scattering from fish schools can significantly contribute to volume reverberation in the open ocean measured by mid-frequencies tactical SONAR (1kHz-10kHz), especially if the resonance frequencies of the fish air-filled swim bladder is excited. Furthermore, multiple scattering effects from the incident acoustic wave and the collective arrangement of fish lead to complicated frequency response functions. The bio-acoustics properties of the fish body and geometry can also contribute to the scattering response and can be incorporated into an accurate scattering model. The objective of this research is to characterize the relevant spatial and temporal scales of bio-acoustic scatterers generating ocean reverberation to effectively parametrize acoustic models and improve the detection performance of long-range SONAR systems. To do so, we will first develop an efficient modeling technique predict the scattered fields from large fish schools (which can cause especially high false-alarm rate for mid-frequency SONAR systems.), which readily account for the fish acoustic properties, school s spatial configuration and multiple scattering effects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2012
- Accession Number
- ADA575088
Entities
People
- Karim G. Sabra
Organizations
- Georgia Tech