Doppler Spectra From a Two-Dimensional Ocean Surface at L-Band

Soriano, Gabriel; Joelson, Maminirina; Saillard, Marc

doi:10.1109/tgrs.2006.873580

Cited by 55 publications

(29 citation statements)

References 32 publications

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“…Also applying the MOMI, Johnson et al [16] carried out a comparative research for different nonlinear sea surface models. Recently, Soriano et al [17] extended the Doppler spectral analysis to the two-dimensional (2-D) nonlinear surfaces on the basis of small-slope integral equation method. Nouguier et al [18] combined the so-called nonlinear "choppy wave model" (CWM) [19] with the weighted curvature approximation (WCA) probing the impact of nonlinear wave profiles on scattering from sea surfaces.…”

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

View full text Add to dashboard Cite

show abstract

“…Due to the interactions of the harmonics, the assumption of the linear model is no longer valid in high frequency bands. Based on the hydrodynamic equations, the one-dimensional nonlinear surface is derived as the Hilbert transform of the linear surface [17]. The vector Hilbert transform is expressed as…”

Section: Nonlinear Sea Surfacementioning

confidence: 99%

Backscattering From Electrically Large Target Above Nonlinear Sea Surface

Luo¹,

Yang²,

Hao³

2017

PIER M

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Abstract-The composite scattering of an electrically large target above nonlinear sea surface is analyzed based on the reciprocity theorem. The two-dimensional nonlinear sea surface is simulated with the Fast Fourier transform (FFT), with which the phase modified two-scale method is utilized to calculate the scattering field of the wind-driven sea surface. The electromagnetic currents of the sea surface, which are excited with plane wave, are calculated with the iterated Kirchhoff approximation (KA). The coupling scattering between the target and the sea surface, which includes the complex scattering matrix of composite scattering, is ingeniously reduced to the integrals involving the target scattering and high order currents of sea surface. A sensitivity analysis is performed for the dependency of the coupling scattering on the target features. The relationship of the full composite scattering model with the sea state is examined, which provides theoretical basis for the target recognition.

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“…The classical TSM are used to calculate the scattering coefficient based on the sea spectrum other than the height fluctuation of the sea surface. In order to obtain sea surface scattering field, the TSM is modified as the facet-based model [34,35], in which both phase shifts associated with the traveled path distance and the reflection coefficients for each scattering facet are considered…”

Section: Composite Backscattering Modelmentioning

confidence: 99%

Composite Scattering of Ship on Sea Surface With Breaking Waves

Min¹,

Luo²,

Luo³

et al. 2012

PIER

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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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Doppler Spectra From a Two-Dimensional Ocean Surface at L-Band

Cited by 55 publications

References 32 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

Backscattering From Electrically Large Target Above Nonlinear Sea Surface

Composite Scattering of Ship on Sea Surface With Breaking Waves

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