为了改善传统模基参数估计(model-based parameter estimation,MBPE)计算量大、参数难选择以及复杂环境电磁场重构困难的问题,提出将滑动窗口法与模基参数估计法相结合(model-based parameter estimation with the sliding window,SW-MB...为了改善传统模基参数估计(model-based parameter estimation,MBPE)计算量大、参数难选择以及复杂环境电磁场重构困难的问题,提出将滑动窗口法与模基参数估计法相结合(model-based parameter estimation with the sliding window,SW-MBPE)算法,通过少量采样数据即可重构二维空间的电磁场分布。将研究区域划分为不同的滑动窗,再通过模基参数估计(model-based parameter estimation,MBPE)算法在各个窗口内重构电磁场,既可大幅度减小计算量,又能灵活适应剧烈变化的电磁场;通过对相邻窗口重复计算区域的平均化处理,使滑动窗边缘得以平滑,以减轻分块效应。分析SW-MBPE算法的主要参数,得出1组适用于空间电磁场重构的模型参数。仿真结果表明,在均匀采样11%的情况下,SW-MBPE算法重构的FSIM值可达到0.8,可取得较好的重构效果。展开更多
本文将有理函数逼近技术(Rational Function Approximation Technique,RFAT)应用到合元极技术中以快速求解三维复杂目标的宽频带和宽角度散射特性.有理函数逼近技术是计算数学中的一种重要的函数逼近方法.近年来颇受关注的渐进波形估计...本文将有理函数逼近技术(Rational Function Approximation Technique,RFAT)应用到合元极技术中以快速求解三维复杂目标的宽频带和宽角度散射特性.有理函数逼近技术是计算数学中的一种重要的函数逼近方法.近年来颇受关注的渐进波形估计技术(Asymptotic Waveform Evaluation,AWE)和基于模型的参数估计技术(Model-Based ParameterEstimation,MBPE)均属于有理函数逼近的范畴.本文将AWE和MBPE两种有理函数逼近技术应用到合元极技术中,并从理论分析和数值性能的角度研究和比较了两种方法的优劣.典型数值实验表明,有理函数逼近技术结合合元极技术能够极大的加速三维复杂目标宽频带和宽角度散射特性的求解.展开更多
将提升类小波变换(lifting wavelet-like transform,LWLT)应用于矩量法(method of moment,MOM)快速求解电场积分方程(electric fieldintegral equation,EFIE),对生成的稀疏化线性系统采用模基参数估计(model based parameter esti matio...将提升类小波变换(lifting wavelet-like transform,LWLT)应用于矩量法(method of moment,MOM)快速求解电场积分方程(electric fieldintegral equation,EFIE),对生成的稀疏化线性系统采用模基参数估计(model based parameter esti mation,MBPE)算法求解,可获得小波域的宽带解,结合小波逆变换,最终实现目标电磁散射特性的宽频分析。通过不同三维散射体的计算分析,验证了算法的正确性。与传统模基参数估计算法相比,所提算法在计算时间和内存耗费上均有很大改善。展开更多
Abstract The generalized system function, H（s）, directly associated with the radiated or scattered fields is presented to effectively analyze the special resonant behavior of electromagnetic open systems in this pap...Abstract The generalized system function, H（s）, directly associated with the radiated or scattered fields is presented to effectively analyze the special resonant behavior of electromagnetic open systems in this paper, which is adaptively constructed by using the model-based parameter estimation （MBPE） technique in the complex frequency domain. By analyzing the characteristics of complex zeros, poles and residues of H（s） in a finite operational frequency band, we can effectively determine resonant frequencies and resonant intensity of electromagnetic open systems. It is known that an analysis of Q-factor of antenna and scattering systems has been an interesting and challenging problem. Based on H（s） and the complex frequency w theories, a complex frequency method for Q-factor of electromagnetic open systems is presented in this paper. Some examples of the practical antenna arrays are given to illustrate the applications and validity of the generalized system function theory proposed by this paper.展开更多
文摘将提升类小波变换(lifting wavelet-like transform,LWLT)应用于矩量法(method of moment,MOM)快速求解电场积分方程(electric fieldintegral equation,EFIE),对生成的稀疏化线性系统采用模基参数估计(model based parameter esti mation,MBPE)算法求解,可获得小波域的宽带解,结合小波逆变换,最终实现目标电磁散射特性的宽频分析。通过不同三维散射体的计算分析,验证了算法的正确性。与传统模基参数估计算法相比,所提算法在计算时间和内存耗费上均有很大改善。
文摘Abstract The generalized system function, H（s）, directly associated with the radiated or scattered fields is presented to effectively analyze the special resonant behavior of electromagnetic open systems in this paper, which is adaptively constructed by using the model-based parameter estimation （MBPE） technique in the complex frequency domain. By analyzing the characteristics of complex zeros, poles and residues of H（s） in a finite operational frequency band, we can effectively determine resonant frequencies and resonant intensity of electromagnetic open systems. It is known that an analysis of Q-factor of antenna and scattering systems has been an interesting and challenging problem. Based on H（s） and the complex frequency w theories, a complex frequency method for Q-factor of electromagnetic open systems is presented in this paper. Some examples of the practical antenna arrays are given to illustrate the applications and validity of the generalized system function theory proposed by this paper.
