A Study on Scattering from Target and Rough Surface by Using FDTD Method
|School||Huazhong University of Science and Technology|
|Course||Electromagnetic Field and Microwave Technology|
|Keywords||FDTD Electromagnetic Scattering Rough surface Complex targets Meshing Window function|
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 .