2025_programme: High-Frequency Bottom-Loss Estimation Using Ray-Based Blind Deconvolution Combined With Particle Swarm Optimization

• Day: June 19, Thursday
    Location / Time: C. THALIA at 12:00-12:20
• Last minutes changes: -
• Session: 15. Seabed Acoustics
  Organiser(s): Megan Ballard, Kevin Lee, Nick Chotiros
  Chairperson(s): Nicholas Chotiros
• Lecture: High-Frequency Bottom-Loss Estimation Using Ray-Based Blind Deconvolution Combined With Particle Swarm Optimization
  Paper ID: 2231
  Author(s): Wonjun Yang, Dong-Gyun Han, Jee Woong Choi
  Presenter: Wonjun Yang
  Abstract: Ray-based blind deconvolution (RBD) is a technique for estimating channel impulse responses (CIRs) with only received signals, without requiring prior knowledge of the transmitted signal. RBD utilizes a receiver array to derive CIRs by isolating transmitted signal information from the received signals. This process estimates the phase of the transmitted signal through a delay-and-sum process. However, inaccuracies in time delay estimation, caused by factors such as array tilt and spherical spreading at relatively short propagation range, can degrade RBD performance. \nIn this study, we address this challenge by first applying particle swarm optimization (PSO) to achieve precise time delay estimation, followed by the RBD process. The proposed method is applied to the bottom-loss estimation for the site of Shallow-water Acoustic Variability Experiment 2015 (SAVEX15). During SAVEX 15, two 16-element vertical line arrays were deployed to span the water column from 25 to 81 m in a water depth of approximately 105 m. An acoustic source, towed at a speed of ~ 1.5 m/s by the R/V Onnuri, maintained a depth of ~50 m and transmitted linear frequency modulation signals (12-26 kHz).\nCIRs were estimated using three methods: RBD, RBD combined with PSO, and matched filtering. Bottom-loss estimates as a function of grazing angle were then derived by compensating transmission losses in the direct and bottom-reflected paths from the estimated CIRs and comparing the two paths. Results of geoacoustic inversion based on these bottom-loss estimates will also be discussed.\n\n\nThis work was supported by Korea Research Institute for defense Technology planning and advancement (KRIT) -Grant funded by Defense Acquisition Program Administration (DAPA), South Korea (KRIT-CT-23-026, Integrated Underwater Surveillance Research Center for Adapting Future Technologies, 2023–2029).
• Corresponding author: Mr Wonjun Yang
  Affiliation: Hanyang university, ERICA
  Country: Korea, Republic of