Research: Nonlinear Techniques for Remote Sensing
Sponsor: Office of Naval Research
Once a time-domain signal has been recorded, it can be Fourier analyzed to determine its complex amplitude as a function of temporal frequency. The goal of this project is to determine how quadratic (nonlinear) products of the signal amplitude at different frequencies can be used to deduce information about the acoustic environment or remote acoustic sources or scatterers at frequencies outside the signal bandwidth. To date, such nonlinear approaches have been found to be successful in some circumstances for beamforming and for remote source localization.
References:
Abadi, Song & Dowling, JASA 132, 3018-3029 [2012].
Worthmann, Song & Dowling, JASA 138, 3549-3562 [2015].
Worthmann, Song & Dowling, JASA 141, 4579-4590 [2017].
Douglass, Song & Dowling, JASA 142, 1663-1673 [2017].
Lipa, Worthmann & Dowling, JASA 143, 2419-2427 [2018].
Abadi et al., JASA 144, 198-209 [2018].
Dowling, Phys. Rev. Fluids 3, 110506 (17 pages) [2018].
Geroski & Dowling, JASA 146, in press [2019].
Douglass & Dowling, JASA 146, in press [2019].
Douglass & Dowling, JASA 146, 122-134 [2019]
Geroski & Dowling, JASA 146, 4727-4739 [2019]
Worthman & Dowling, JASA 147, 1863-1873 [2020]
Worthman & Dowling, JASA 147, 3960-3968 [2020]
Geroski et al., JASA 149, 853-865 [2021]
Geroski & Dowling, JASA 150, 171-182 [2021]
Joslyn & Dowling, JASA 151, 620-633 [2022]
Neo et al., Geophysical J. International 231, 2173-2185 [2022]
Joslyn et al., MDPI – Acoustics 5, 764-782 [2022]
Geroski et al., JASA 153, 2223-2237 [2023]
Spiesberger et al., J. Theoretical & Comp. Acoust. [2023]
Joslyn et al., JASA 155, 1868-188 [2024]
Joslyn et al., JASA 156, 600-609 [2024]
Joslyn & Dowling, JASA 156, 1887-1902 [2024]
Current Research Projects
1. Predictions of Acoustic Uncertainty
2. Nonlinear Techniques for Remote Sensing
3. Airborne, water-borne, and structural acoustics for reverberant
environments