Numerical analysis of scattered waves from rough surfaces with and without an object
نویسندگان
چکیده
The effects of rough surface scattering on the detection and imaging of objects are important in many applications including the imaging of objects on or near ocean surfaces and the detection of objects buried under ground rough surfaces. This paper focuses on the following problems: (1) Scattering from wedge-like rough surfaces representing ocean surfaces with sharp crested waves. (2) Scattering by objects above or below the rough surfaces. (3) UWB confocal imaging of objects near rough surfaces. Finite-Difference Time-Domain (FDTD) method is used to obtain frequency domain as well as time domain responses. Numerical simulations of various representative cases are conducted to understand and gain insight into the scattering effects on object detection and imaging.
منابع مشابه
Studies of the Angular Correlation Function of Scattering by Random Rough Surfaces with and without - Geoscience and Remote Sensing, IEEE Transactions on
The discrimination of the scattered wave from an object buried in shallow ground from that of the rough surface is a difficult task with present ground penetrating radar (GPR) systems. Recently, a new approach for this classical problem has been proposed and its effectiveness has been verified. This new method is based on the angular correlation function (ACF) of the scattered wave observed at ...
متن کاملImaging and Coherence in Rough Surface and Object Scattering
This paper is concerned with two problems. First, when the object is near a rough surface such as an ocean or terrain, and the transmitter and the receiver are also located near the surface, how can we image or detect the object which may be obscured by multiple scattering due to rough surface scattering. Second, even though multiple scattering generally increases the incoherent field, there ar...
متن کاملA rapid boundary perturbation algorithm for scattering by families of rough surfaces
In this paper we describe a novel algorithm for the computation of scattering returns by families of rough surfaces. This algorithm makes explicit use of the fact that some scattering profiles of engineering interest (e.g., traveling ocean waves) come in branches parameterized analytically by a bifurcation quantity. Our approach delivers recursions which not only can be implemented to yield a r...
متن کاملA new application of reduced Rayleigh equations to electromagnetic wave scattering by two-dimensional randomly rough surfaces
The small perturbations method has been extensively used for waves scattering by rough surfaces. The standard method developped by Rice is difficult to apply when we consider second and third order of scattered fields as a function of the surface height. Calculations can be greatly simplified with the use of reduced Rayleigh equations, because one of the unknown fields can be eliminated. We der...
متن کاملInvestigation on the Scattering Characteristics of Gaussian Beam from Two Dimensional Dielectric Rough Surfaces Based on the Kirchhoff Approximation
The scattering characteristic of paraxial gaussian beam from two dimensional dielectric rough surfaces is studied in this paper. The modification of the Kirchhoff approximation theory for rough surface scattering by an incident gaussian beam instead of a plane wave are developed based on conventional Kirchhoff scattering theory and plane wave spectrum expansion method. The coherent and incohere...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002