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Propagation loss model comparisons on selected scenarios from the Weston memorial workshop

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Author: Sertlek, H.O. · Ainslie, M.A.
Type:article
Date:2013
Source:Proceedings of 1st International Conference on Underwater Acoustics (UAC), 23-28 June 2013, Corfu, Greece, 441-448
Identifier: 483504
Keywords: Marine · Underwater Acoustics · Propagation Loss · Acoustic propagation · Benchmark · Weston Memorial · Performance Prediction · Sonar · Acoustic Communication · Propagation Models · Defence Research · Defence, Safety and Security · Physics & Electronics · AS - Acoustics & Sonar · TS - Technical Sciences

Abstract

The accurate and stable calculation of underwater acoustic propagation is needed for applications such as sonar performance prediction, noise mapping and acoustic communication. In this work, some widely used acoustic propagation models, based on different methods such as normal mode, ray tracing, parabolic equation and flux theory are tested on the scenarios specified for the Weston Memorial Workshop, held at the University of Cambridge in 2010. Incoherent, coherent and depth-averaged propagation losses are generated for range independent and range-dependent scenarios. The effects of each method's characteristic parameters (such as number of rays, stair-step size, Weston's approximations, range and depth resolution etc.) on propagation loss are investigated. Propagation loss results and run times of each model are compared at the different frequencies, ranges and receiver depths. An automated script has been developed to carry out systematic convergence tests from a single input file. Using this script, comparisons are made of propagation loss results generated by different methods. These comparisons provide insight to the optimal choice of running parameters and performance of each model.