Model for the frequency spread of backscattered underwater sound based on the facet model of the rough sea surface

1978 ◽  
Vol 64 (2) ◽  
pp. 605-613
Author(s):  
Herward Schwarze
Keyword(s):  
Sea Surface ◽  
Underwater Sound ◽  
Frequency Spread ◽  
Rough Sea Surface ◽  
Facet Model ◽  
Rough Sea

scholarly journals Angular Composite Facet Model with Shadowing Treatment for Backscattering from Two-Dimensional Rough Sea Surface

Symmetry ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 402
Author(s):  
Xiaojun Wang ◽  
Xingyuan You ◽  
Nan Bi ◽  
Tao Jiang
Keyword(s):  
Incident Angle ◽  
Sea Surface ◽  
Ocean Wave ◽  
Two Dimensional ◽  
Ship Wake ◽  
Shadowing Effects ◽  
Scattering Contribution ◽  
Rough Sea Surface ◽  
Facet Model ◽  
Rough Sea

Recent diverse applications on ocean wave synthetic aperture radar (SAR) images have a potential demand for individual facet scattering contribution rather than the total average radar cross-section (RCS) by statistical scattering models. However, only a few facet methods have been proposed and fewer have considered shadowing effects, which are thought to be non-negligible at large incident angle. In view of this, we proposed an angular composite facet model (ACFM) with shadowing treatment to investigate the backscattering from two-dimensional rough sea surface. First, a region division formula for ACFM without shadowing treatment is proposed to classified sea surface facets into specular facets and diffusion facets based on which kind of scattering is dominate from each facet, and the corresponding scattering contribution is calculated either by Kirchhoff approximation (KA) or by a small perturbation method (SPM) with a tilting process. Second, an electromagnetic shadowing algorithm based on facets grouping is adopted to handle the shadowing effects in a geometric manner with moderate computation complexity gained. Finally, comparisons between numerical backscattering evaluations and experimental data demonstrate that this new ACFM can attain accurate numerical results and the geometric facets grouping method is a practical way to tackle shadowing effects despite a certain acceptable gap. Therefore, the whole ACFM can simulate ocean wave SAR imaging, especially for those electrically large surfaces and to evaluate the scattering from sea surface with different local nature, such as sea spikes, foams, spilled oil, swells, and ship wake.

scholarly journals Research on the facet model of electromagnetic scatterings from rough sea surface with foams

2014 ◽  
Vol 63 (21) ◽  
pp. 214104
Author(s):  
Fan Tian-Qi ◽  
Guo Li-Xin ◽  
Jin Jian ◽  
Meng Xiao
Keyword(s):  
Sea Surface ◽  
Rough Sea Surface ◽  
Facet Model ◽  
Rough Sea

Two-Position HF Scattering from the Rough Sea Surface. II. Experiment

2005 ◽  
Vol 64 (12) ◽  
pp. 1003-1016
Author(s):  
A. S. Bryukhovetsky ◽  
Yu. M. Yampolski ◽  
A. S. Kashcheyev ◽  
S. B. Kashcheyev ◽  
A. B. Koloskov ◽  
...  
Keyword(s):  
Sea Surface ◽  
Rough Sea Surface ◽  
Rough Sea

Two-Position HF Scattering from the Rough Sea Surface. I. Theory

2005 ◽  
Vol 64 (12) ◽  
pp. 991-1001
Author(s):  
A. S. Bryukhovetsky ◽  
Yu. M. Yampolski ◽  
A. S. Kashcheyev ◽  
S. B. Kashcheyev
Keyword(s):  
Sea Surface ◽  
Rough Sea Surface ◽  
Rough Sea

scholarly journals Modified PO–PO hybrid method for scattering of 2D ship model on the rough sea surface

2018 ◽  
Vol 13 (2) ◽  
pp. 156-162 ◽  
Author(s):  
Mahdi Behdani ◽  
Parisa Dehkhoda ◽  
Ahad Tavakoli ◽  
Mohammad Zoofaghari
Keyword(s):  
Hybrid Method ◽  
Sea Surface ◽  
Ship Model ◽  
Rough Sea Surface ◽  
Rough Sea
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