Experimental Study of Geoacoustic Inversion with Reliable Acoustic Path in the Philippine Sea

Xu, Liya; Yang, Kunde; Yang, Qi

doi:10.1142/s2591728518500615

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Besides localization and communication, RAP sound energy has also been applied in geo-acoustic inversion and ocean tomography. Geo-acoustic parameters in the Philippine Sea were obtained using RAP sound energy (Xu et al, 2019), and Varamo et al examined the feasibility of RAP tomography by employing a mobile ship with an acoustic source transmitting to a fixed bottom hydrophone at the ALOHA Cabled Observatory (Varamo and Howe, 2016).…”

Section: Introductionmentioning

confidence: 99%

Investigating the reliable acoustic path properties in a global scale

Liu,

Chen,

Feng

2023

Front. Mar. Sci.

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Leveraging the benefits of low transmission loss and high signal-to-noise ratio, the reliable acoustic path (RAP) has been extensively employed in various underwater applications. In this study, we investigate RAP properties on a global scale. Acoustic simulations were conducted using global grids with a 0.25° × 0.25° spatial resolution, revealing that RAP range is positively correlated with ocean depth. Contrary to the prevailing belief that RAP properties are relatively unaffected by sound speed variations, our findings indicate that sound speed profiles (SSPs) play a crucial role in determining RAP properties by altering the RAP from 15 km to 50 km at a constant ocean depth of 4000 m. Additionally, the receiver angle can vary by nearly 5 km at the same source location due to SSP variations. Consequently, utilizing highly accurate SSPs can enhance the performance of underwater localization or communication systems that rely on RAP.

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Section: Introductionmentioning

confidence: 99%

Investigating the reliable acoustic path properties in a global scale

Liu,

Chen,

Feng

2023

Front. Mar. Sci.

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“…Generally, geoacoustic parameters, such as sediment sound speed, attenuation, and density can be estimated by matching the measured acoustic characteristics with the replicas generated from the acoustic computational model. Following this thought, the matched-field inversion method [4] exploits the spatial diversity of the channel's response and the reflection inversion method [5] used the reflection-coefficient data collected at different frequencies and angles. However, these methods usually require an array to receive signals.…”

Section: Introductionmentioning

confidence: 99%

Sequential Parameter Estimation of Modal Dispersion Curves with an Adaptive Particle Filter in Shallow Water: Experimental Results

Liu

Yang

2021

Remote Sensing

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An adaptive particle filter method is presented for performing sequential geoacoustic estimation of a shallow water acoustic environment using the explosive sound sources. This approach treats environmental parameters and source–receiver distance as unknown random variables that evolve as the source moves. As a sequential estimation method, this approach reduces the expense of computation than genetic algorithm and yields results with the same accuracy. Comparing with standard Particle filter, proposed method can adjust control parameters to adapt to a rapidly changing environment. This approach is demonstrated on the shallow water sound propagation data which was collected during the ASIAEX 2001 experiment. The results indicate that the geoacoustic parameters are well estimated and source–receiver distance are also well determined.

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Comparison of the FWI-Adjoint and Time Reversal Methods for the Identification of Elastic Scatterers

Rabinovich

Amitt

Givoli

et al. 2022

J. Theor. Comp. Acout.

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The paper falls into the category of computational methods for inverse scattering techniques for the identification of scatterers. We consider a linear elastodynamic problem and compare two popular methods for identifying a scatterer in the domain. Finite elements are employed with each of the two methods for spatial discretization. One method considered is Full Waveform Inversion using a gradient-based optimization and the adjoint method. In the adjoint procedure for calculating the gradient, we use the variant of discretizing the unknown parameters from the outset while all other variables remain continuous. Gradient optimization is performed in the examples using a quasi-Newton method. The other method compared is the computational Time Reversal technique, which is used in combination with an augmentation procedure to enhance performance. advantages and limitations of the two methods are outlined, and their performance is compared through an example from geophysics.

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Experimental Study of Geoacoustic Inversion with Reliable Acoustic Path in the Philippine Sea

Cited by 4 publications

References 22 publications

Investigating the reliable acoustic path properties in a global scale

Investigating the reliable acoustic path properties in a global scale

Sequential Parameter Estimation of Modal Dispersion Curves with an Adaptive Particle Filter in Shallow Water: Experimental Results

Comparison of the FWI-Adjoint and Time Reversal Methods for the Identification of Elastic Scatterers

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