A shallow-water normal-mode reverberation model

Ellis, Dale D.

doi:10.1121/1.411910

Cited by 124 publications

(48 citation statements)

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“…선 방정식, [3] 정상모드이론, [4][5][6] 음선이론 기반 [7,8] 의 잔향음 모델들이 연구되어졌고, 국내에서는 Kim et al [9] 이 포물선 방정식을 기반으로 천해에서의 양상 태 잔향음 모델을 제안한 이후로 음선이론 [10,11] 과 정 상모드이론 [12,13] 을 을 계산하는 방법도 중요하다. [14] 양상태 산란단면적은 단위 면적에 대해 계산할 경 우, [15] [16] 의 방법과 Weinberg [8] 가 제안한 방법을 사용한다.…”

Section: 음원과 수신기 사이에 교차 산란단면적을 이용한 양상태 잔향음 모의unclassified

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Bistatic reverberation simulation using intersection of scattering cross section between sound source and receiver

Oh¹,

Kim²,

Son³

et al. 2017

The Journal of the Acoustical Society of Korea

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It is important to predict accurately reverberation level, which is a limiting factor in underwater target detection. Recently, the studies have been expanded from monostatic sonar to bistatic sonar in which source and receivers are separated. To simulate the bistatic reverberation level, the computation processes for propagation, scattering strength, and scattering cross section are different from those in monostatic case and more complex computation processes are required. Although there have been many researches for bistatic reverberation, few studies have assessed the bistatic scattering cross section which is a key factor in simulate reverberation level. In this paper, a new method to estimate the bistatic scattering cross section is suggested, which uses the area of intersection between two circles. Finally, the reverberation levels simulated with the scattering cross section estimated using the method suggested in this paper are compared with those estimated using the methods previously suggested and those measured from an acoustic measurements conducted in May 2013.

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Section: 음원과 수신기 사이에 교차 산란단면적을 이용한 양상태 잔향음 모의unclassified

“…[4,14] 잔향음 준위 모의에 사용된 전달손실은 송수신기 와 경계면까지의 전달거리에 대해 확산손실과 흡수 손실 모델을 고려하였다. 확산손실의 경우 구형분산 을 고려하였고 흡수손실은 Francois와 Garrison에 의 해 제안된 모델 [17] 을 적용하여 계산하였다.…”

Section: Cox는unclassified

Bistatic reverberation simulation using intersection of scattering cross section between sound source and receiver

Oh¹,

Kim²,

Son³

et al. 2017

The Journal of the Acoustical Society of Korea

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“…에서는 해석적 방법 [3,4] 을 이용하거나 음선 이론, [5][6][7] 양방향 포물선 방정식법, [8] 유한요소법, [9] 정상모드 법 [10][11][12][13][14][15] 을 이용한 잔향음 모델이 제시되었다.…”

Section: 서 론unclassified

Long range incoherent seafloor reverberation model based on coupled normal mode method

Park¹,

Choo²,

Lee³

et al. 2016

The Journal of the Acoustical Society of Korea

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핵심용어: 양상태 비상관 잔향음, 연성모드법, 거리 종속 환경ABSTRACT: In this paper, the incoherent reverberation model based on coupled normal mode method is presented. In the range dependent environment, one way coupled normal mode method is used to calculate the pressure from a source to a scatterer patch and the pressure from a scatterer patch to a receiver. For the computational efficiency, the sound propagation from a source/receiver to the scatterer patch is assumed to occur only in the 2D plane where a source/receiver and scatterer patch are located. For the model verification, problems of the reverberation modeling workshop I and II sponsored by the US office of Naval Research are calculated and the results are compared with the incoherent reverberation model results based on the ray method.

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“…The modeling of volume scattering in a shallow water waveguide can be found in the work by Ellis [40], Tang [8] and Tracey [7].…”

Section: Morse and Ingardmentioning

confidence: 99%

Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data

Li¹

1997

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Acoustic propagation in the ocean inevitably encounters inhomogeneities of various types, which give rise to scattering. Acoustic scattering from rough water /bottom interfaces comprised of exposed rocks and sea mountains gives way to volumetric scattering in areas with fiat interfaces and thick sediment cover. The data analysis of the ARSRP backscattering experiment revealed that random inhomogeneities in two irregular layers beneath the seafloor were the primary contributors to oblique backscattering in a sediment pond on the western flank of the Mid-Atlantic Ridge. In this thesis, an attempt has been made to model monostatic backscattering from 3-D volume inhomogeneities in the sediment and to compare the results with the ARSRP backscattering data.A scattering process cannot be modeled correctly without a proper account of the incident field . Several approximate propagation models have been evaluated against the exact solution, while the appropriateness of using the equivalent surface scattering strength in volume scattering characterizations is studied. This study concludes that precautions need to be taken in modeling both the propagation effects and the scattering mechanisms associated with the bottom volume scattering process.A volume scattering model based on perturbation theory and the Born approximation is developed incorporating contributions from both sound speed and density fluctuations. With the propagation part handled accurately by OASES and random fluctuations generated effectively by a new scheme modified from the spectral method, the model is capable of simulating the monostatic backscattered field and time series due to 3-D volumetric sediment inhomogeneities. Both the characteristic length scale and power spectrum descriptions of the random inhomogeneities are shown to have great impact on the backscattered field by parameter studies in a free-space scenario. The important roles played by horizontal anisotropy and the vertical correlation of the random field have been demonstrated. Density fluctuations are further confirmed to be the dominant force in backscattering. The model matches the ARSRP backscattering data very well , with the fluctuations of sound speed and density in the two irregular layers described by a power law type of power spectrum. To my fellow-students in 5-007 and 5-435, thank you for t he wonderful atmosphere that you have created and t he team-work spirit t hat I have enjoyed. Believe me, you are t he best.Life would not have been so fun without all my friends. Qing, Henry, and Chenyang, how about playing some Tetris the next t ime we get together? And t hank you for introducing me t o the "real world" . Wenjie and Co. , guess no card game is scheduled for now. Thank you, Elaine, for many "Sloanish" advice, Lia ng-wu, for the ride to chase t he sunset, Richard , for the parties, and Feng, for making me a part-time Ashdowner. Helen, Lan and Xiaoou, I will surely not forget t he summer at Cape Cod.My most grateful thanks goes to my parents and my sister. You are ...

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A shallow-water normal-mode reverberation model

Cited by 124 publications

References 0 publications

Bistatic reverberation simulation using intersection of scattering cross section between sound source and receiver

Bistatic reverberation simulation using intersection of scattering cross section between sound source and receiver

Long range incoherent seafloor reverberation model based on coupled normal mode method

Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data

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