Bistatic Acoustic Scattering From Munitions: Interactions with Nearby Clutter and the Water-Sediment Interface
Abstract
SERDP MR19-1234 investigated a number of issues with simulations of the acoustic scattering from objects near the water-sediment interface. The initial effort focused on three primary objectives of bistatic scattering, multiple scattering between an object-of-interest and nearby clutter, and simulations for the Multi-Sensor Towbody (MuST) that is being developed under ESTCP MR18-5004. First, full bistatic acoustic scattering capabilities were developed within the Target-in-the-Environment Response model (TIER) framework. Sonar platforms under development for underwater munitions remediation have relatively large spatial separation between acoustic sources and receiving-array elements in comparison to the expected stand-off distances to an object. Second, when a munition is in close proximity to another object (e.g., another munition, scuba tank, boat anchor, ...), the acoustic scattering from the munition and object can interact. The interaction yields a complicate, composite target signature. Second- through fourth-order multiple scattering was integrated into the TIER model. Multiple scattering is inherently a bistatic scattering geometry, so progress on the first objective is a requirement. Third, the TIER model with these new capabilities is used in the generation of simulated data for ESTCP MR18-5004 to aid in the development of detection, classification, and geolocation algorithms. In addition to the first two primary objectives, a few limitations in the TIER model were addressed. These include integration of frequency-dependent beam patterns for a source or receiver, a variable sound speed profile in the water column, and partial/full burial model refinements. Finally, acoustic scattering from lightweight lines used in deployment and recovery of objects in a test bed was investigated in collaboration with SERDP MR21-7211.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 21, 2023
- Accession Number
- AD1226163
Entities
People
- Aubrey Espana
- Steven Kargl
Organizations
- University of Washington