2023_programme: An initial look at modelling echo from an air hose during the Target and Reverberation Experiment 2013

• Session: 13. Sonar Performance Modelling and Verification: Applications to Active and Passive Sonar
  Organiser(s): Mathieu Colin, Mark Prior, Kevin Heaney and Dale Ellis
• Lecture: An initial look at modelling echo from an air hose during the Target and Reverberation Experiment 2013 [invited]
  Paper ID: 2026
  Author(s): Ellis Dale D, Yang Jie
  Presenter: Ellis Dale
  Abstract: The Target and Reverberation Experiment (TREX13) was conducted in shallow water (~20 m) in the Gulf of Mexico off Panama City, Florida, USA. Extensive acoustic measurements were made in April and May 2013 using pulses in various sub-bands between 1800 and 3600 Hz, generally with both source and receiver in fixed-fixed position. Previous work has concentrated on reverberation characteristics in the area [Ellis et al., IEEE J. Oceanic Eng., 42, 344–361, 2017; Yang et al., IEEE J. Oceanic Eng., 43, 563–585, 2018]. Here we concentrate on the echo from a vertically deployed 15-m air-filled hose, starting 2 m above the bottom from 2–14 May. The primary receiver was the FORA horizontal array deployed in near-monostatic geometry, but some data were received with a vertical line array in bistatic geometry. Here we use a normal mode based approach to predict the echo returns. A complete model would consider the coherent scattered field as a function of depth along the array at multiple frequencies, and convolve with a pulse propagation model to compare with the processed (pulse-compressed) data. We take a simpler approach, and use an energy-based model that uses a single frequency and modal group velocities [Ellis, J. Acoust. Soc. Am., 97, 2804–2814, 1995] to describe the received echo. Various scattering models will be used: an omnidirectional point scatterer at the mid-point of the array, a point scatterer at mid-depth with beam pattern corresponding to 15-m vertical array, a number of point scatterers distributed over depth, and a “volume flow” approach [T. Stanton, J. Acoust. Soc. Am., 82, 55–63, 1988] simulating scattering from a pressure release vertical cylinder. Results will be compared with TREX13 measurements of the hose echo during a period with relatively low wind speed.\n [Work supported by US Office of Naval Research]
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• Corresponding author: Dr Dale Ellis
  Affiliation: Mount Allison University
  Country: Canada
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