Estimation of the Acoustic Transducer Beam Aperture by Using the Geometric Backscattering Model for Side-Scan Sonar...

Area of Science:

• Oceanography
• Acoustic Engineering
• Marine Geophysics

Background:

• Side-scan sonar systems are crucial for seabed imaging.
• Accurate beam aperture estimation is essential for sonar data quality and calibration.
• Existing methods may lack precision in determining transducer beam characteristics.

Purpose of the Study:

• To propose and validate a novel algorithm for estimating the beam aperture of acoustic transducers.
• To utilize a geometric backscattering model for improved side-scan sonar analysis.
• To enhance the calibration process and accuracy of seabed imagery.

Main Methods:

• Development of a geometric backscattering model to trace signal paths from transducers to the seabed and back to hydrophones.
• Implementation of a custom-built side-scan sonar system with dual-frequency transducers.
• Application of the proposed algorithm to estimate beam apertures for each transducer.

Main Results:

• The proposed algorithm successfully estimated the beam apertures of the acoustic transducers.
• Obtained results showed strong agreement with manufacturer-provided specifications.
• The estimated beam apertures were effectively used to calibrate the scanned sonar images.

Conclusions:

• The developed algorithm provides a reliable method for estimating acoustic transducer beam aperture in side-scan sonar.
• Accurate beam aperture estimation leads to improved sonar image calibration and data interpretation.
• The study demonstrates the practical application and effectiveness of the proposed method with 3D sonar images of the Dong Do lakebed.