Computation of Radar Scattering From Heterogeneous Rough Soil Using the Finite-Element Method

Khankhoje, Uday K.; Zyl, J.J. van; Cwik, T.

doi:10.1109/tgrs.2012.2225431

Cited by 17 publications

(9 citation statements)

References 33 publications

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“…2 the NRCS of 1-D PEC rough sea surface is solved by the PO method, IPO method, and conventional MOM method [7], respectively. Both HH and VV polarizations are concluded.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…For example, the KA [3], which is also referred to as the physical optics (PO) method, requires that every point on the rough surface have a large radius of curvature relative to the incident wavelength. In the other hand some numerical approaches, such as the method of moments (MOM) [5], the finite difference time-domain (FDTD) method [6], the finite element method (FEM) [7], and some fast algorithms based on them are also applied to the problem of EM scattering from rough surface. These numerical methods are capable of simulating surfaces with arbitrary roughness.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Scattering From 1-D Sea Surface With Large Windspeed by Using Iterative Physical Optics Algorithm

Li¹,

Li²,

Guo³

2017

PIER M

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Abstract-In the paper, the electromagnetic scattering (EM) from a one-dimensional (1-D) perfectly electric conducting (PEC) randomly rough sea surface with large windspeed is investigated by the iterative physical optics (IPO) algorithm. In this method the multiple coupling interactions among points on sea surface are considered. To improve computational efficiency, the local coupling technique is adopted to accelerate the iterative process. In numerical results, the EM scattering by 1-D sea surface for different polarizations is calculated and compared with that by the conventional method of moments (MOM), as well as the computing time and memory requirements. In addition, the influence of some parameters on the scattering of sea surface are investigated and discussed in detail, such as the threshold of coupling distance, iteration numbers, and windspeed.

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“…2 the NRCS of 1-D PEC rough sea surface is solved by the PO method, IPO method, and conventional MOM method [7], respectively. Both HH and VV polarizations are concluded.…”

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering From 1-D Sea Surface With Large Windspeed by Using Iterative Physical Optics Algorithm

Li¹,

Li²,

Guo³

2017

PIER M

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“…To account for the scattering appropriately, it is important to study the effect of variation in the salinity profile. Recently, different scattering models have been used to study the influence of moisture profiles on the backscattering of layered soil [5,6]. To the best of our knowledge, the influence of salinity profiles on the backscattering from sea ice has not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…The FEM is applied to the numerical modelling of physical systems in a wide variety of engineering disciplines. This approach has been used to study the scattering from soil [6] and a target above rough sea surfaces [12]. We tailor the FEM for layered sea ice by introducing the concept of totaland scattered-field decomposition (TSFD).…”

Section: Introductionmentioning

confidence: 99%

“…However, the 3D model has a higher-order complexity and needs much more computational time and memory than a 2D model, especially for the scattering simulations of sea ice with a set of varying geophysical parameters. Compared with the scattering from 2D surfaces, the scattering from 1D surfaces shows the same trend as a function of the surface roughness, correlation length, dielectric constant, and incidence angle for surfaces with isotropic roughness [6,13]. Thus, we restrict the model to 2D to provide instructive simulation results efficiently.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Microwave Scattering from Layered Sea Ice Based on the Finite Element Method

Brekke

Doulgeris

et al. 2018

Remote Sensing

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A two-dimensional scattering model based on the Finite Element Method (FEM) is built for simulating the microwave scattering of sea ice, which is a layered medium. The scattering problem solved by the FEM is formulated following a total- and scattered-field decomposition strategy. The model set-up is first validated with good agreements by comparing the results of the FEM with those of the small perturbation method and the method of moment. Subsequently, the model is applied to two cases of layered sea ice to study the effect of subsurface scattering. The first case is newly formed sea ice which has scattering from both air–ice and ice–water interfaces. It is found that the backscattering has a strong oscillation with the variation of sea ice thickness. The found oscillation effects can increase the difficulty of retrieving the thickness of newly formed sea ice from the backscattering data. The second case is first-year sea ice with C-shaped salinity profiles. The scattering model accounts for the variations in the salinity profile by approximating the profile as consisting of a number of homogeneous layers. It is found that the salinity profile variations have very little influence on the backscattering for both C- and L-bands. The results show that the sea ice can be considered to be homogeneous with a constant salinity value in modelling the backscattering and it is difficult to sense the salinity profile of sea ice from the backscattering data, because the backscattering is insensitive to the salinity profile.

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A mesh reconfiguration scheme for speeding up Monte Carlo simulations of electromagnetic scattering by random rough surfaces

Khankhoje

Cwik

2014

Computer Physics Communications

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Computation of Radar Scattering From Heterogeneous Rough Soil Using the Finite-Element Method

Cited by 17 publications

References 33 publications

Electromagnetic Scattering From 1-D Sea Surface With Large Windspeed by Using Iterative Physical Optics Algorithm

Electromagnetic Scattering From 1-D Sea Surface With Large Windspeed by Using Iterative Physical Optics Algorithm

Numerical Analysis of Microwave Scattering from Layered Sea Ice Based on the Finite Element Method

A mesh reconfiguration scheme for speeding up Monte Carlo simulations of electromagnetic scattering by random rough surfaces

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