Journal ArticleDOI
Radar images of rough surface scattering: comparison of numerical and analytical models
Hyunjun Kim,Joel T. Johnson +1 more
TLDR
In this article, backprojection tomography is applied to form two-dimensional (2D) synthetic aperture radar images from deterministic surface scattered field data at multiple incidence angles and frequencies.Abstract:
Rough surface scattering theories are investigated through analysis of radar images. Backscatter results from 10 GHz to 14 GHz under tapered wave illumination are considered for one-dimension (1D) random rough surface realizations which satisfy an impedance boundary condition. Back-projection tomography is applied to form two-dimensional (2D) synthetic aperture radar images from deterministic surface scattered field data at multiple incidence angles and frequencies. Numerical predictions of surface backscattered fields are obtained from an accelerated forward-backward (FB) method and the resulting images are compared with those obtained from approximate scattering theories such as the physical optics (PO) approximation, the small slope approximation (SSA), and the nonlocal SSA (NLSSA). The resulting radar images illustrate scattering sources associated with single and multiple scattering on the boundary, and a ray tracing analysis confirms the locations of time-delayed image points due to double reflections. For single scattering effects, the images demonstrate excellent agreement between analytical and numerical methods in both horizontal and vertical polarizations. For surfaces with RMS height 2.0 cm and correlation length 7.5 cm at normal incidence, multiple-scattering effects are observed and successfully captured when the lowest-order NLSSA is employed.read more
Citations
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Journal ArticleDOI
A critical survey of approximate scattering wave theories from random rough surfaces
TL;DR: In this paper, the authors provide a critical and up-to-date survey of the analytical approximate methods that are encountered in scattering from random rough surfaces and provide synthetic tables of their respective performances, according to a dozen important requirements a valuable method should meet.
A novel acceleration algorithm for the computation of scattering from rough surfaces with the forward-backward method
TL;DR: In this paper, an acceleration algorithm for more rapidly computing interactions between widely separated points in the forward-backward method is proposed and results in an O(N) algorithm with increasing surface size.
Journal ArticleDOI
Extension of the ADI-FDTD method to Debye media
TL;DR: In this article, an extension of the alternating direction implicit finite-difference time domain (ADI-FDTD) method was proposed to analyze problems involving Debye media, where the authors describe an extension to the ADI algorithm to analyze Debye Media.
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Statistical Properties of Low-Grazing Range-Resolved Sea Surface Backscatter Generated Through Two-Dimensional Direct Numerical Simulations
TL;DR: The simulation technique allows for the isolation and examination of the impacts of certain e/m and hydrodynamic approximations, including the replacement of rigorous solution to the BIE by a simpler analytical scattering model.
Journal ArticleDOI
A Positioning Lockholes of Container Corner Castings Method Based on Image Recognition
TL;DR: This method converts the original image of the containers captured by a camera into the HSV (Hue, Saturation, Value) color space and can locate the corner casting in the image by using the General Hough Transform fitting algorithm onto ellipses.
References
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