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应用渐近波形估计技术快速计算宽带雷达散射截面 总被引:3,自引:0,他引:3
将渐近波形估计技术应用到矩量法中 ,计算了任意形状二维理想导体目标的宽带雷达散射截面 .计算中使用矩量法和奇异值分解技术求解电场积分方程 ,得到一展开频率点的表面电流密度 ,通过Pad啨近似求出给定频带内任意频率点的表面电流密度分布 ,进而计算出散射场和雷达散射截面 .奇异值分解技术的使用消除了电场积分方程的内谐振问题 .对数值计算结果与矩量法逐点求解的结果进行了比较 ,两者吻合良好 ,且计算效率提高了约一个数量级 相似文献
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应用渐近波形估计技术快速计算宽带雷达散射截面 总被引:4,自引:0,他引:4
将渐近波形估计技术应用到矩量法中,计算了任意形状二维理想导体目标的宽带雷达散射截面.计算中使用矩量法和奇异值分解技术求解电场积分方程,得到一展开频率点的表面电流密度,通过Padé近似求出给定频带内任意频率点的表面电流密度分布,进而计算出散射场和雷达散射截面.奇异值分解技术的使用消除了电场积分方程的内谐振问题.对数值计算结果与矩量法逐点求解的结果进行了比较,两者吻合良好,且计算效率提高了约一个数量级. 相似文献
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利用电场积分方程(EFIE)的矩量法分析了导体平板上有铆钉的电磁散射问题.铆钉和平板表面采用三角形面元进行剖分,面元上的电流分布用子域基函数表示,用伽略金法将电场方程转化为矩阵方程求解电流系数.数值计算了导体平板上有无铆钉时的雷达散射截面随入射角的变化,结果显示当平板上有多铆钉时,在一定的角度范围内,铆钉对雷达散射截面的影响非常明显并且与铆钉的分布情况有关. 相似文献
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采用渐近波形估计技术(AWE)和预处理技术求解导体目标的宽带雷达散射截面(RCS)。应用矩量法求解导体目标的电场积分方程,通过构造预条件算子,使由矩量法得到的阻抗矩阵稀疏化,从而计算导体表面电流时变得简便,再结合渐近波形估计(AWE)技术计算导体目标的宽带雷达散射截面(RCS)。实例结果表明,该方法在计算电大导体目标时具有较高的计算效率和很好的精度。 相似文献
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渐近波形估计技术在三维电磁散射问题快速分析中的应用 总被引:13,自引:0,他引:13
本文将渐近波形估计技术应用到矩量法中,计算了三维理想导体目标的宽带雷达散射截面(RCS)和单站RCS方向图.用矩量法求解电场积分方程,得到给定频率点、给定方向入射波照射下的导体表面电流密度,应用渐近波形估计技术分别得到频带内任意频率点以及任意角度入射波照射下的导体表面电流密度,进而计算出宽带RCS和单站RCS方向图.计算结果表明渐近波形估计技术与矩量法结合可以逼近矩量法逐点计算的结果,且计算效率大大提高. 相似文献
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考虑导体柱的电磁散射 ,由于一般实际导体为良导体 ,若利用表面阻抗的边界条件 ,则良导体柱的电场积分方程 (EFIE)为第二类Fredholm积分方程 ;将矩量法 (MOM )应用到该积分方程时 ,该积分方程转化为第二类Fredholm矩阵方程。本文提出了一种求解第二类Fredholm矩阵方程的Lanczos AWE递归迭代快速算法 ,首先采用Lanczos技术快速求解在某一给定频率或角度时第二类Fredholm矩阵方程 ,得到在该频率或角度时良导体的表面电流分布 ;然后采用渐近波形估计 (AWE)技术求取所考虑的频段内任意频率或角度范围内任意角度时良导体的表面电流分布。根据表面电流分布预测了任意形状良导体柱的单站雷达散射截面 (RCS)的宽带与宽角响应。计算结果表明Lanczos AWE技术可大大加快MOM法的计算速度。 相似文献
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A simple moment solution to the problem of the diffraction of a TM plane wave from an infinite, perfectly conducting slotted cylinder of an arbitrary cross section is summarized. The slit cylinder encloses a smaller perfectly conducting cylinder of an arbitrary cross section, and the space between the cylinders is filled with a dielectric material. The equivalence principle is used to obtain a set of coupled integral equations for the induced/equivalent surface currents on the cylinders, and the method of moments is used to solve numerically the integral equations. The electric field integral equation formulation is used. The advantages and the limitations of the method are discussed. Sample results for the induced current, aperture field, internal field, and scattering cross sections are given. These are in good agreement with some of the available published data 相似文献
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将切比雪夫逼近理论应用于目标宽带电磁散射特性分析中,通过求解给定频带内的切比雪夫节点和节点处的目标表面电流,实现了频带内任意频率点表面电流的快速预测,从而实现目标宽带雷达散射截面的快速计算.组合场积分方程的使用消除了内谐振问题.将计算结果与传统矩量法逐点计算的结果进行了比较,结果表明在不影响精度的前提下,该方法的计算效率大大提高. 相似文献
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An analysis is presented for determining the current induced by a known transverse electric excitation on a perfectly conducting cylinder located near the planar interface separating two semi-infinite, homogeneous half-spaces of different electromagnetic properties. The conducting cylinder of general cross section is of infinite extent and the excitation is transverse electric to the cylinder axis. Two types of integral equations, the magnetic field integral equation and the electric field integral equation, are formulated, and the Green's functions for the integral equations are derived in an appendix. Numerical solution methods for solving the integral and integrodifferential equations are presented. For a strip parallel or perpendicular to the interface, a circular cylinder, and a rectangular cylinder, data are presented and discussed for selected parameters, including the case of a cylinder resting on the interface. 相似文献
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Michalski K.A. Nevels R.D. Zheng D. 《Antennas and Propagation, IEEE Transactions on》1990,38(5):732-739
Two forms of the so-called mixed-potential electric field integral equation (MPIE) are developed for two-dimensional perfectly conducting (PC) surfaces of arbitrary shape in the presence of an infinite PC cylinder of circular cross section subject to transverse-electric (TE) excitation. One of the MPIEs is based on the Coulomb gauge; the other uses the Lorentz gauge. In either case, the effect of the cylinder is incorporated in the integral equation by means of the appropriate Green's functions, leaving the current distribution on the arbitrary surface as the only unknown. The Green's functions are derived by the eigenfunction expansion technique. An existing well-established moment method procedure is adapted to solve both forms of the MPIE numerically. Computed results are presented for several cases of interest, and the relative merits of the Coulomb and Lorentz gauge MPIEs are discussed 相似文献