Dissertation > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism

A Study on Scattering from Target and Rough Surface by Using FDTD Method

Author FuYuTao
Tutor ChenPing
School Huazhong University of Science and Technology
Course Electromagnetic Field and Microwave Technology
Keywords FDTD Electromagnetic Scattering Rough surface Complex targets Meshing Window function
Type Master's thesis
Year 2011
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With the continuous development of environmental remote sensing and radar detection technology , randomly rough surfaces and complex target electromagnetic scattering research attention gradually . How to target accurately model under various incident wave conditions and rough surface computing electromagnetic scattering model is an important goal of this kind of problem . Computing capacity increased dramatically in recent years , more and more scholars into the study of the rough surface and the target is calculated by the numerical method . In this paper, using the FDTD numerical method for rough surfaces and complex target electromagnetic scattering characteristics were analyzed . This article studies the rough surface scattering FDTD calculation method , to achieve a two-dimensional aspects of the introduction of the source , the incident in any angle in the three-dimensional case the introduction of the whole space , no leakage incident plane wave source . Focus on the window of the plane wave incident introduced , and further improvements , and new window function to load the way a rough surface scattering problem and incident introduced . This new incident wave loading method can guarantee in case of any incident angle , the incident can be a good and rough surface central area of ??interaction , greatly reducing the oblique incidence leaked directly into the side of the absorbing boundary The incident wave component . A good solution to the wide-angle oblique incidence case , the increase in the amount of computation and computational accuracy degradation rough surface scattering calculations . Lies in accurate target model gridded subdivision and the incident based on FDTD electromagnetic scattering problems dealing with complex target load properly . This paper presents a target mesh method based of AUTOCAD entity tool . This method makes full use of the existing three-dimensional drawing software entities split function , greatly reducing the target split time , to improve the computational efficiency of the overall objective of electromagnetic scattering .

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