First steps toward simultaneous Bayesian environmental inversion and source localization for acoustic transmissions across the Gulf Stream front

Résumé fourni par la source

The 2023 pilot for the New England Seamounts Calibrated Acoustic Fluctuations Experiment (NESCAFE23) was an experiment to characterize acoustic propagation through the complex acoustic environment of the Seamounts and Gulf Stream current system. Due to a mooring failure the observations consist of only twenty-three, 200–300 Hz acoustic transmissions over a single day across the Gulf Stream front at a range of approximately 150 km. In addition, there was a hydrographic section along the acoustic path 30 days later. The receptions contain several fully refracted acoustic paths, and many acoustic paths that reflect off the bottom and surface as many as 15 times. These steeper angle paths are less sensitive to the vertical structure of the sound speed than the fully refracted paths. When the environment is accurately known, the source localization problem is fully determined and is robustly solved using linear Bayesian methods. However, if the constraint of a known environment is relaxed, the problem becomes underdetermined. In this presentation, we demonstrate biases to the linear Bayesian source localization due to using different model environments, formulate the simultaneous source localization and environment inversion in a Bayesian framework, and present first steps toward evaluating the inversion [work supported by ONR]

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.