Investigation of Low-Grazing-Angle Microwave Backscattering From Threedimensional Breaking Sea Waves

Luo, Wei; Zhang, Min; Wang, Chao; Yin, Hongcheng

doi:10.2528/pier11062607

Cited by 11 publications

(11 citation statements)

References 42 publications

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“…In this study, we revised the CWM to take the finite-depth effect into account. Moreover, we just consider sea surfaces of constantly finite depth, the extra effects of wave energy dissipation such as breaking [23,24] are certainly not taken into account.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Doppler Spectral Characteristics of Electromagnetic Backscattered Echoes From Dynamic Nonlinear Surfaces of Finite-Depth Sea

Nie¹,

Min²,

Geng³

et al. 2012

PIER

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Abstract-The Doppler spectral characteristics of electromagnetic backscattered echoes from dynamic nonlinear surfaces of finite-depth sea is investigated with the second-order small-slope approximation (SSA-II). The revised nonlinear hydrodynamic choppy wave model (CWM) combining with an experiment-verified shoaling coefficient is utilized to model the finite-depth sea wave profiles, and the simulated surfaces of finite-depth sea show steeper crests and more flat troughs as depth decreases. First, Comparison of the Doppler spectra for linear sea surfaces and nonlinear choppy sea surfaces shows that nonlinear hydrodynamic effect greatly enhances the Doppler shift and the Doppler spectrum bandwidth, and the predicted results agree well with the rigorous numerical model data. The Doppler spectra of backscattered echoes from finite-depth sea with different depths are further evaluated. At small incident angles, the Doppler shifts and the spectra bandwidths are much lower for shallower sea, and the opposite situation can be gradually observed for increased incident angles. This indicates that the nonlinear wave-wave interactions among waves occur more frequently in finite-depth sea and the long waves will be suppressed while shorter wind waves will be boosted in shallower water. Moreover, the dependence of the Doppler spectral characteristics on polarization is also discussed.

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Section: Introductionmentioning

confidence: 99%

Investigation on Doppler Spectral Characteristics of Electromagnetic Backscattered Echoes From Dynamic Nonlinear Surfaces of Finite-Depth Sea

Nie¹,

Min²,

Geng³

et al. 2012

PIER

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“…σ 0 denotes the backscattering coefficient of the ocean surface [24][25][26][27][28][29], calculated using the GIT model [2] in this work. The pattern propagation factor accounts for the effect of refractivity structure M and the pattern function of the transmitting antenna.…”

Section: Radar Wave Propagation Modelingmentioning

confidence: 99%

Evaporation Duct Retrieval Using Changes in Radar Sea Clutter Power Versus Receiving Height

Zhang¹,

Wu²,

Zhang³

et al. 2012

PIER

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Abstract-A method for retrieving evaporation duct height (EDH) is introduced in this paper. The proposed technique employs the changes in radar sea clutter power observed at different heights as input information. It identifies the EDH associated with the modeled clutter change pattern that best matches measured change patterns. The performance of the method is evaluated in terms of RMS errors in retrieving actual EDHs that range from 0 to 40 m. The comparison of the proposed method with the conventional clutter pattern matching method shows that the former more effectively retrieves actual EDHs.

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“…According to the measured sea clutter and photographs in experiments, the spilling ones are approximately simulated with the dihedral wedges of finite length shown in Figure 1. The dihedral wedge is characterized by the internal angle β, length d, width 2l and height h, and the validation of the approximation has been proved [29].…”

Section: Geometric Modelmentioning

confidence: 99%

Composite Scattering of Ship on Sea Surface With Breaking Waves

Min¹,

Luo²,

Luo³

et al. 2012

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Abstract-The composite backscattering of the ship model on sea surface is investigated with the spilling breaking waves and ship bow waves. The spilling breakers are approximately modeled with the wedge-like waves, and the ship bow waves are simulated based on the Kelvin model. With the modified four-path model, each scattering component is evaluated with the high frequency approximation methods for the total composite scattering. Due to the volume scattering, the composite scattering at large incidence angles is strongly enhanced by the non-Bragg scattering. The relationship of the composite scattering and the ship motion is analyzed. The numerical results of sea surface scattering agree with the measured data well, and the complex physical mechanism of the low-grazing-angle composite scattering is explicitly evaluated in this paper.

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Investigation of Low-Grazing-Angle Microwave Backscattering From Threedimensional Breaking Sea Waves

Cited by 11 publications

References 42 publications

Investigation on Doppler Spectral Characteristics of Electromagnetic Backscattered Echoes From Dynamic Nonlinear Surfaces of Finite-Depth Sea

Investigation on Doppler Spectral Characteristics of Electromagnetic Backscattered Echoes From Dynamic Nonlinear Surfaces of Finite-Depth Sea

Evaporation Duct Retrieval Using Changes in Radar Sea Clutter Power Versus Receiving Height

Composite Scattering of Ship on Sea Surface With Breaking Waves

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