基于矩量法与渐近波形估计技术的动态海面宽带电磁散射特性研究

项目名称： 基于矩量法与渐近波形估计技术的动态海面宽带电磁散射特性研究

项目编号： No.61501004

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 王安琪

作者单位： 安徽大学

项目金额： 19万元

中文摘要： 随着宽带和超宽带雷达信号的应用，动态海面的宽带电磁散射特性吸引了越来越多的关注，而以矩量法(MoM)为基础的频域计算方法存在多次重复计算、需要较多计算内存和计算时间的缺陷。本项目拟突破传统方法在解决该问题时计算精度、内存需求和计算效率无法兼顾的难题，以锥形波照射下一维动态海面和高斯波束照射下二维动态海面的宽带电磁散射特性为研究对象，重点围绕电磁波低掠角入射下一维及高海情二维动态海面宽带电磁散射特性进行研究。项目首先采用MoM或特征基函数方法(CBFM)精确获得一个或多个采样频点处动态海面的电磁散射，然后利用AWE技术获得宽带范围内动态海面电磁散射的有理拟合函数，同时，针对二维动态海面，引入非均匀有理B样条(NURBS)曲面建模技术减少未知量的个数。为动态海面宽带电磁散射的定量分析提供具有可操作性的技术手段，为宽带和超宽带雷达系统的设计、高海情动态海上运动目标的探测提供理论依据和技术支撑。

中文关键词： 宽带电磁散射；动态海面；矩量法；渐近波形估计；特征基函数法

英文摘要： With the application of the wide band and ultra-wide band radar, more and more attentions have been attracted into the properties of the wide band electromagnetic scattering from the dynamic ocean surface. However, for the method of moments (MoM) and its associated frequency domain methods, there are several defects, such as repeated calculation, requiring more computational memory and computing time. In this project, we will try to solve the difficulties of the above methods. The calculation accuracy, memory requirement and computational efficiency will be taken into account at the same time. The properties of the wide band electromagnetic scattering from the one-dimensional dynamic ocean surface illuminated by the tapered plane wave and those of the two-dimensional dynamic ocean surface illuminated by the Gaussian beam will be calculated and analyzed. We focus on the properties of the one-dimensional dynamic ocean surface on low-grazing incident angle and those of the two-dimensional dynamic ocean surface under high sea condition.The MoM or the characteristic basis function method (CBFM) is firstly adopted to accurately obtain the electromagnetic scattering from the dynamic ocean surface at one or more sampling frequency. And then, the asymptotic waveform evaluation (AWE) technique is applied to obtain the rational fitting function within the scope of broadband electromagnetic scattering from the dynamic ocean surface. At the same time, the non-uniform rational B-spline (NURBS) surface modeling is introduced to reduce the number of unknowns of the two-dimensional dynamic ocean surface. This project will provide an operable technology for quantitatively analyzing of the wide band electromagnetic scattering from the dynamic ocean surface, and provide theoretical basis and technical support for the designing of the broadband or the ultra-wideband radar system, the detecting of targets moving on the dynamic ocean surface under high sea condition.

英文关键词： Wide band electromagnetic scattering;Dynamic ocean surface;Method of moments;Asymptotic waveform evaluation;Characteristic basis function method