VB与MATLAB混合编制基于矩量法的导体目标RCS计算软件

针对VB和MATLAB各自的特点,首先在MATLAB中编制基于矩量法的导体目标RCS计算函数文件,然后利用ActiveX自动化技术,在VB中调用MATLAB函数实现对RCS的计算,通过将VB和MATLAB两者结合起来并用VB编制成具有友好人机交互能力的软件,实现了数据、图形和界面的有机结合。最后对典型实例进行了分析计算,结果与相关文献吻合良好,证明了本软件计算结果的正确性,实践表明,该软件具有较好的实用性和推广价值。     

应用ACA算法快速分析导体目标电磁散射特性

提出了一种分析导体目标电磁散射特性的有效数值方法,该方法以矩量法为基础,将自适应交叉近似算法应用于远场组阻抗矩阵的低秩压缩计算,并且结合等效偶极子法加速抽取阻抗矩阵元素的填充。与传统矩量法相比,计算时间和内存消耗都得到了有效缩减,数值结果证明了该方法的精确性和有效性。     

机载箔条弹RCS测量系统的设计实现

针对外场测量机载箔条弹RCS时,当箔条弹与载机分离后展开的箔条云会与载机同时处于雷达分辨单元内,测量设备无法准确测量箔条云展开过程中RCS时间特性的问题,开发了基于新的测量方法——频谱法的测量系统;在介绍了系统工作原理的基础上,进行了系统硬件设计,开发了系统应用软件,提高了测量精度;经运行测试,该系统操作方便,测试准确,性能稳定,满足实际需求。     

用于舰船目标SAR成像仿真的高频区RCS计算

针对舰船雷达目标雷达散射截面计算问题,提出了一种将快速建模和改进的图形电磁算法相结合的方法。利用搜集的舰船素材和建模软件对某型舰船进行较为精确的外形仿真建模,运用物理光学法和增量长度绕射系数法结合的改进图形电磁算法较为准确地计算了雷达散射截面。仿真实验表明,该算法在近实时条件下可得到良好的SAR图像仿真结果。     

基于MapX的无人机生存力分析系统

生存力是无人机设计和使用中最优先考虑的技术指标之一,针对现代战场仿真对态势实时显示及分析结果直观表现的要求,应用MapX组件技术研制了无人机生存力分析系统。首先,简要介绍了MapX的主要框架和特点,讨论了无人机生存力分析系统的功能、组成,并给出了系统的模块划分和程序流程;然后,详细分析了在VC++环境中结合MapX技术实现战区地图显示、漫游、缩放以及作战想定、生存力数据显示处理的功能;最后,给出了生存力分析仿真算例。仿真实验表明,该系统能真实、直观、动态地表现无人机所处的战场地理环境,便于生存力影响因素的分析。     

Electromagnetic scattering by arbitrarily shaped stratified anisotropic media using the equivalent dipole moment method

The equivalent dipole moment method, which was used to model the isotropic media, is extended and applied to the analysis of the electromagnetic scattering characteristics of arbitrarily shaped multilayer electric anisotropic media in this work. The initial motivation to put forward this method is based on the intrinsic physical properties of the electric anisotropic media whose constitutive parameter permittivity is a tensor matrix that can be modeled as equivalent electric dipole moment. This method employs the method of moments to solve the electric field volume integral equation (VIE) formulated by discretizing the scattering body into tetrahedral volume elements, in which the electrical parameters are assumed constant in each element. Then the VIE is solved directly to obtain the scattered field. Numerical results are given to validate the accuracy and efficiency of this method. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.     

Efficient analysis of wireless communication antennas using an accurate [Z] matrix interpolation technique

An accurate impedance matrix interpolation technique based on the surface integral equation (SIE) is presented for the analysis of wireless communication antennas over wide frequency bands. The first‐order derivative of the impedance matrix at the internal frequency is considered in the cubic polynomial‐based interpolation scheme, thus the novel impedance matrix interpolation scheme will provide high accuracy and high efficiency over a frequency band. To demonstrate the efficiency and accuracy of the proposed method, numerical results for planar inverted F antennas (PIFA) and a wideband E‐shaped patch antenna are presented. Good agreement among the interpolation results, exact MoM solutions, finite element method (FEM) solutions, and measured data is observed over the bandwidth. Besides, dimensions of the feeding probe are also studied to investigate their effect on the input impedance and radiation patterns. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.     

Fast solution of volume–surface integral equation for scattering from composite conducting‐dielectric targets using multilevel fast dipole method

This article presents a fast solution to the volume–surface integral equation for electromagnetic scattering from three‐dimensional (3D) targets comprising both conductors and dielectric materials by using the multilevel fast dipole method (MLFDM). This scheme is based on the concept of equivalent dipole‐moment method (EDM) that views the Rao–Wilton–Glisson and the Schaubert–Wilton–Glisson basis functions as dipole models with equivalent dipole moments. In the MLFDM, a simple Taylor's series expansion of the terms R^α (α = 1, ?1, ?2, ?3) and R? R? in the formulation of the EDM transforms the interaction between two equivalent dipoles into an aggregation–translation–disaggregation form naturally. Furthermore, benefiting from the multilevel grouping scheme, the matrix‐vector product can be accelerated and the memory cost is reduced remarkably. Simulation results are presented to demonstrate the efficiency and accuracy of this method. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012.     

基于精细计算的动载荷反演问题正则化求解

提出了一种新的动态载荷识别的时域法,通过精细计算法建立精确的动态载荷识别问题反演模型,对该反演问题对应的结构矩阵进行奇异值分解,剖析了动态载荷识别病态问题的本质,并引入正则化技术寻求一稳定近似解;最后将提出的方法成功应用于平面框架结构的动态载荷识别,为动态载荷识别的理论发展和实际应用打下一定的基础．     

Fast computation technique of Green's function and its boundary integrals for multilayered medium structures by using Fourier series expansion and method of images

This paper presents a systematic technique to improve the convergence of the Green's function for multilayered medium structure by introducing a three-layered model into the multilayered system. The technique uses a combination of Fourier series expansion and method of images. Numerical analysis demonstrates dramatic improvements of the convergence of Green's function and its boundary integrals. © 1998 John Wiley & Sons, Inc. Int J RF and Microwave CAE 8: 474–483, 1998