Generation of Synthetic SAS Data for Targets near the Seafloor: Propagation Component
WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
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The primary objective of the proposed research is continued development of an APL-UW synthetic aperture sonar simulation tool SAS-ST. This tool can generate sets of realistic signals suitable for SAS and acoustic color template i.e., target strength as a function of aspect angle and frequency processing for targets near the seafloor. Updates to the propagation component are tested and validated against experimental data. The proposed research includes a few specific aims for improvements to SAS-ST. First, a fast ray-based model for propagation in a homogenous waveguide, which tracks time-of-flight wave packets from sources to targets and then to receivers, was reduced a fluid-fluid, half-space model and applied to a circular SAS simulation. The ray model use image sources and receivers to account for interaction with the water-sediment interface. Validation of the half-space model was carried out by comparison to Pond Experiment 2010 PondEx10 data and against finite-element model FEM simulations.
- Physical and Dynamic Oceanography
- Acoustic Detection and Detectors