National Taiwan Ocean University Institutional Repository:Item 987654321/51670
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 28611/40649
造訪人次 : 642747      線上人數 : 60
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 進階搜尋


題名: A study of backscattering from multi-scale rough surface
作者: K. S. Chen
T. D. Wu
A. K. Fung
貢獻者: 國立臺灣海洋大學:電機工程學系
日期: 2012-04-03
上傳時間: 2018-12-14T08:15:30Z
出版者: Journal of Electromagnetic Waves and Applications
摘要: Abstract: Most of the rough surfaces are generally multiscale in nature as observed by radar even at narrow-band. In this paper, we apply the modulation concept to study the characteristics of backscattering from such a multiscale surface, using the IEM scattering model. The modulated surface is special kind of multiscale surface in that a random surface is superimposed upon a periodic type surface. The modulation is rationed from the fact the measured correlation function usually exhibits zero-crossing which equally states the fact that the maxima of surface spectra is shifted toward the higher wavenumber. The amount of the frequency shift depends on the modulation wavenumber. It changes the spectral decay rates behind the peak valued. The normal incidence angle can be significantly shifted as well. It is also found the maximum modulation wavenumber is related by the inverse of base-band correlation length. In all cases studied, it was found that the modulation effects significantly changes the backscattering behavior, both its angular trend and level, and is polarization dependent. It is inferred from this study that the actual surface correlation length is very difficult to measure and may not be defined by a single parameter. In fact, radar can only observe effective correlation length under an operation frequency, which in turns depends on modulation wavenumber. In particular, in terms of retrieval, the correlation length measured by the radar and that by field measured may have quite different meanings.
關聯: 12(7) pp.961-979
顯示於類別:[電機工程學系] 期刊論文


檔案 描述 大小格式瀏覽次數



著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋