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Viscoacoustic prestack reverse time migration based onthe optimal time-space domain high-order finite-difference method 被引量:7
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作者 赵岩 刘洋 任志明 《Applied Geophysics》 SCIE CSCD 2014年第1期50-62,116,共14页
Prestack reverse time migration (RTM) is an accurate imaging method ofsubsurface media. The viscoacoustic prestack RTM is of practical significance because itconsiders the viscosity of the subsurface media. One of t... Prestack reverse time migration (RTM) is an accurate imaging method ofsubsurface media. The viscoacoustic prestack RTM is of practical significance because itconsiders the viscosity of the subsurface media. One of the steps of RTM is solving thewave equation and extrapolating the wave field forward and backward; therefore, solvingaccurately and efficiently the wave equation affects the imaging results and the efficiencyof RTM. In this study, we use the optimal time-space domain dispersion high-order finite-difference (FD) method to solve the viscoacoustic wave equation. Dispersion analysis andnumerical simulations show that the optimal time-space domain FD method is more accurateand suppresses the numerical dispersion. We use hybrid absorbing boundary conditions tohandle the boundary reflection. We also use source-normalized cross-correlation imagingconditions for migration and apply Laplace filtering to remove the low-frequency noise.Numerical modeling suggests that the viscoacoustic wave equation RTM has higher imagingresolution than the acoustic wave equation RTM when the viscosity of the subsurface isconsidered. In addition, for the wave field extrapolation, we use the adaptive variable-lengthFD operator to calculate the spatial derivatives and improve the computational efficiencywithout compromising the accuracy of the numerical solution. 展开更多
关键词 REVERSE time migration Viscoacoustic Optimization Adaptive time-spacedomain finite-difference
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Full-Wave Analysis of Slotline Using Time-Domain Finite-Difference Method
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作者 李媛 罗贺琴 言华 《Transactions of Tianjin University》 EI CAS 2002年第1期43-47,共5页
The transmission and dispersive characteristics of slotline are calculated in this paper. The tail of Gaussion pulse is improved because a modified dispersive boundary condition (DBC) is adopted. It leads to a reduct... The transmission and dispersive characteristics of slotline are calculated in this paper. The tail of Gaussion pulse is improved because a modified dispersive boundary condition (DBC) is adopted. It leads to a reduction in computer memory requirements and computational time. The computational domain is greatly reduced to enable performance in personal computer. At the same time because edges of a boundary and summits are treated well, the computational results is more accurate and more collector. 展开更多
关键词 time domain finite difference SLOTLINE modified dispersive boundary condition
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Finite difference time domain method forward simulation of complex geoelectricity ground penetrating radar model 被引量:5
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作者 戴前伟 冯德山 何继善 《Journal of Central South University of Technology》 EI 2005年第4期478-482,共5页
The ground penetrating radar(GPR) forward simulation all aims at the singular and regular models, such as sandwich model, round cavity, square cavity, and so on, which are comparably simple. But as to the forward of c... The ground penetrating radar(GPR) forward simulation all aims at the singular and regular models, such as sandwich model, round cavity, square cavity, and so on, which are comparably simple. But as to the forward of curl interface underground or “v” figure complex model, it is difficult to realize. So it is important to forward the complex geoelectricity model. This paper takes two Maxwell’s vorticity equations as departure point, makes use of the principles of Yee’s space grid model theory and the basic principle finite difference time domain method, and deduces a GPR forward system of equation of two dimensional spaces. The Mur super absorbed boundary condition is adopted to solve the super strong reflection on the interceptive boundary when there is the forward simulation. And a self-made program is used to process forward simulation to two typical geoelectricity model. 展开更多
关键词 ground penetrating radar finite difference time domain method forward simulation ideal frequency dispersion relationship
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Finite-difference time-domain studies of low-frequency stop band in superconductor-dielectric superlattice 被引量:1
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作者 王身云 刘少斌 Le-Wei Joshua Li 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第8期374-378,共5页
The transmission coefficients of electromagnetic (EM) waves due to a superconductor-dielectric superlattice are numerically calculated. Shift operator finite difference time domain (SO-FDTD) method is used in the ... The transmission coefficients of electromagnetic (EM) waves due to a superconductor-dielectric superlattice are numerically calculated. Shift operator finite difference time domain (SO-FDTD) method is used in the analysis. By using the SO-FDTD method, the transmission spectrum is obtained and its characteristics are investigated for different thicknesses of superconductor layers and dielectric layers, from which a stop band starting from zero frequency can be apparently observed. The relation between this low-frequency stop band and relative temperature, and also the London penetration depth at a superconductor temperature of zero degree are discussed, separately. The low-frequency stop band properties of superconductor-dielectric superlattice thus are well disclosed. 展开更多
关键词 shift operator finite difference time domain method SUPERCONDUCTOR superconductor- dielectric superlattice high-pass filter
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Uniform stable conformal convolutional perfectly matched layer for enlarged cell technique conformal finite-difference time-domain method 被引量:1
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作者 王玥 王建国 陈再高 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第2期128-136,共9页
Based on conformal construction of physical model in a three-dimensional Cartesian grid,an integral-based conformal convolutional perfectly matched layer(CPML) is given for solving the truncation problem of the open... Based on conformal construction of physical model in a three-dimensional Cartesian grid,an integral-based conformal convolutional perfectly matched layer(CPML) is given for solving the truncation problem of the open port when the enlarged cell technique conformal finite-difference time-domain(ECT-CFDTD) method is used to simulate the wave propagation inside a perfect electric conductor(PEC) waveguide.The algorithm has the same numerical stability as the ECT-CFDTD method.For the long-time propagation problems of an evanescent wave in a waveguide,several numerical simulations are performed to analyze the reflection error by sweeping the constitutive parameters of the integral-based conformal CPML.Our numerical results show that the integral-based conformal CPML can be used to efficiently truncate the open port of the waveguide. 展开更多
关键词 enlarged cell technique CONFORMAL finite-difference time-domain convolutional perfectlymatched layer
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Investigation of three-pulse photon echo in thick crystal using finite-difference time-domain method 被引量:1
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作者 马秀荣 徐林 +1 位作者 常世元 张双根 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第4期190-197,共8页
This paper investigates the phenomenon of three-pulse photon echo in thick rare-earth ions doped crystal whose thickness is far larger than 0.002 cm which is adopted in previous works.The influence of thickness on the... This paper investigates the phenomenon of three-pulse photon echo in thick rare-earth ions doped crystal whose thickness is far larger than 0.002 cm which is adopted in previous works.The influence of thickness on the three-pulse photon echo's amplitude and efficiency is analyzed with the Maxwell-Bloch equations solved by finite-difference timedomain method.We demonstrate that the amplitude of three-pulse echo will increase with the increasing of thickness and the optimum thickness to generate three-pulse photon echo is 0.3 cm for Tm^(3+):YAG when the attenuation of the input pulse is taken into account.Meanwhile,we find the expression 0.09 exp(α'L),which is previously employed to describe the relationship between echo's efficiency and thickness,should be modified as 1.3 · 0.09 exp(2.4 ·α'L) with the propagation of echo considered. 展开更多
关键词 three-pulse photon echo Maxwell-Bloch equations finite-difference time-domain method
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A Novel Absorbing Boundary Condition for the Frequency-Dependent Finite-Difference Time-Domain Method
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作者 WANG Tong, ZHANG Wen jun, GE Ren wei, LIU Wei liang School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China 《Journal of Shanghai University(English Edition)》 CAS 2001年第2期111-115,共5页
A new absorbing boundary condition (ABC) for frequency dependent finite difference time domain algorithm for the arbitrary dispersive media is presented. The concepts of the digital systems are introduced to the (F... A new absorbing boundary condition (ABC) for frequency dependent finite difference time domain algorithm for the arbitrary dispersive media is presented. The concepts of the digital systems are introduced to the (FD) 2TD method. On the basis of digital filter designing and vector algebra, the absorbing boundary condition under arbitrary angle of incidence are derived. The transient electromagnetic problems in two dimensions and three dimensions are calculated and the validity of the ABC is verified. 展开更多
关键词 dispersive media fdtd(finite different time domain) absorbing boundary condition digital filter
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Optical simulation of in-plane-switching blue phase liquid crystal display using the finite-difference time-domain method 被引量:1
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作者 窦虎 马红梅 孙玉宝 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期117-121,共5页
The finite-difference time-domain method is used to simulate the optical characteristics of an in-plane switching blue phase liquid crystal display.Compared with the matrix optic methods and the refractive method,the ... The finite-difference time-domain method is used to simulate the optical characteristics of an in-plane switching blue phase liquid crystal display.Compared with the matrix optic methods and the refractive method,the finite-difference timedomain method,which is used to directly solve Maxwell's equations,can consider the lateral variation of the refractive index and obtain an accurate convergence effect.The simulation results show that e-rays and o-rays bend in different directions when the in-plane switching blue phase liquid crystal display is driven by the operating voltage.The finitedifference time-domain method should be used when the distribution of the liquid crystal in the liquid crystal display has a large lateral change. 展开更多
关键词 finite-difference time-domain method blue phase liquid crystal display in-plane switching convergence effect
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An efficient locally one-dimensional finite-difference time-domain method based on the conformal scheme
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作者 魏晓琨 邵维 +2 位作者 石胜兵 张勇 王秉中 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期74-82,共9页
An efficient conformal locally one-dimensional finite-difference time-domain(LOD-CFDTD) method is presented for solving two-dimensional(2D) electromagnetic(EM) scattering problems. The formulation for the 2D tra... An efficient conformal locally one-dimensional finite-difference time-domain(LOD-CFDTD) method is presented for solving two-dimensional(2D) electromagnetic(EM) scattering problems. The formulation for the 2D transverse-electric(TE) case is presented and its stability property and numerical dispersion relationship are theoretically investigated. It is shown that the introduction of irregular grids will not damage the numerical stability. Instead of the staircasing approximation, the conformal scheme is only employed to model the curve boundaries, whereas the standard Yee grids are used for the remaining regions. As the irregular grids account for a very small percentage of the total space grids, the conformal scheme has little effect on the numerical dispersion. Moreover, the proposed method, which requires fewer arithmetic operations than the alternating-direction-implicit(ADI) CFDTD method, leads to a further reduction of the CPU time. With the total-field/scattered-field(TF/SF) boundary and the perfectly matched layer(PML), the radar cross section(RCS) of two2 D structures is calculated. The numerical examples verify the accuracy and efficiency of the proposed method. 展开更多
关键词 conformal scheme locally one-dimensional(LOD) finite-difference time-domainfdtd method numerical dispersion unconditional stab
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Perfect plane-wave source for a high-order symplectic finite-difference time-domain scheme
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作者 王辉 黄志祥 +1 位作者 吴先良 任信钢 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第11期365-370,共6页
The method of splitting a plane-wave finite-difference time-domain (SP-FDTD) algorithm is presented for the initiation of plane-wave source in the total-field / scattered-field (TF/SF) formulation of high-order sy... The method of splitting a plane-wave finite-difference time-domain (SP-FDTD) algorithm is presented for the initiation of plane-wave source in the total-field / scattered-field (TF/SF) formulation of high-order symplectic finite- difference time-domain (SFDTD) scheme for the first time. By splitting the fields on one-dimensional grid and using the nature of numerical plane-wave in finite-difference time-domain (FDTD), the identical dispersion relation can be obtained and proved between the one-dimensional and three-dimensional grids. An efficient plane-wave source is simulated on one-dimensional grid and a perfect match can be achieved for a plane-wave propagating at any angle forming an integer grid cell ratio. Numerical simulations show that the method is valid for SFDTD and the residual field in SF region is shrinked down to -300 dB. 展开更多
关键词 splitting plane-wave finite-difference time-domain high-order symplectic finite-differencetime-domain scheme plane-wave source
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A spherical higher-order finite-difference time-domain algorithm with perfectly matched layer
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作者 刘亚文 陈亦望 +1 位作者 张品 刘宗信 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第12期166-176,共11页
A higher-order finite-difference time-domain(HO-FDTD) in the spherical coordinate is presented in this paper. The stability and dispersion properties of the proposed scheme are investigated and an air-filled spheric... A higher-order finite-difference time-domain(HO-FDTD) in the spherical coordinate is presented in this paper. The stability and dispersion properties of the proposed scheme are investigated and an air-filled spherical resonator is modeled in order to demonstrate the advantage of this scheme over the finite-difference time-domain(FDTD) and the multiresolution time-domain(MRTD) schemes with respect to memory requirements and CPU time. Moreover, the Berenger's perfectly matched layer(PML) is derived for the spherical HO-FDTD grids, and the numerical results validate the efficiency of the PML. 展开更多
关键词 higher-order finite-difference time-domain spherical coordinates STABILITY numerical dispersion perfectly matched layer
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Numerical Solutions of Finite Well in Two Dimensions Using the Finite Difference Time Domain Method
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作者 Huwaida K.Elgweri Amal Hamed Mohamed Mansor 《Journal of Physical Science and Application》 2022年第1期12-18,共7页
The higher excited states for two dimensional finite rectangular well potential are calculated numerically,by solving the Schrödinger equation using the finite difference time domain method.Although,this method i... The higher excited states for two dimensional finite rectangular well potential are calculated numerically,by solving the Schrödinger equation using the finite difference time domain method.Although,this method is suitable to calculate the ground state of the quantum systems,it has been improved to calculate the higher excited states directly.The improvement is based on modifying the iterative process involved in this method to include two procedures.The first is known as cooling steps and the second is known as a heating step.By determining the required length of the cooling iteration steps using suitable excitation energy estimate,and repeating these two procedures using suitable initial guess function for sufficient times.This modified iteration will lead automatically to the desired excited state.In the two dimensional finite rectangular well potential problem both of the suitable excitation energy and the suitable initial guess wave function are calculated analytically using the separation of variables technique. 展开更多
关键词 finite difference time domain method diffusion equation separation of variables method finite well potential Schrödinger equation
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Modeling of Surface Waves in a Fluid Saturated Poro-Elastic Medium under Initial Stress Using Time-Space Domain Higher Order Finite Difference Method
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作者 Anjana P. Ghorai R. Tiwary 《Applied Mathematics》 2013年第3期469-476,共8页
In this present context, mathematical modeling of the propagation of surface waves in a fluid saturated poro-elastic medium under the influence of initial stress has been considered using time dependent higher order f... In this present context, mathematical modeling of the propagation of surface waves in a fluid saturated poro-elastic medium under the influence of initial stress has been considered using time dependent higher order finite difference method (FDM). We have proved that the accuracy of this finite-difference scheme is 2M when we use 2nd order time domain finite-difference and 2M-th order space domain finite-difference. It also has been shown that the dispersion curves of Love waves are less dispersed for higher order FDM than of lower order FDM. The effect of initial stress, porosity and anisotropy of the layer in the propagation of Love waves has been studied here. The numerical results have been shown graphically. As a particular case, the phase velocity in a non porous elastic solid layer derived in this paper is in perfect agreement with that of Liu et al. (2009). 展开更多
关键词 LOVE WAVES FLUID Saturated Initially Stressed POROUS Layer time-Space domain finite difference Scheme Accuracy Dispersion Analysis Phase Velocity
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Finite-difference time-domain modeling of curved material interfaces by using boundary condition equations method
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作者 卢佳 周怀春 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期198-206,共9页
To deal with the staircase approximation problem in the standard finite-difference time-domain(FDTD) simulation,the two-dimensional boundary condition equations(BCE) method is proposed in this paper.In the BCE met... To deal with the staircase approximation problem in the standard finite-difference time-domain(FDTD) simulation,the two-dimensional boundary condition equations(BCE) method is proposed in this paper.In the BCE method,the standard FDTD algorithm can be used as usual,and the curved surface is treated by adding the boundary condition equations.Thus,while maintaining the simplicity and computational efficiency of the standard FDTD algorithm,the BCE method can solve the staircase approximation problem.The BCE method is validated by analyzing near field and far field scattering properties of the PEC and dielectric cylinders.The results show that the BCE method can maintain a second-order accuracy by eliminating the staircase approximation errors.Moreover,the results of the BCE method show good accuracy for cylinder scattering cases with different permittivities. 展开更多
关键词 finite-difference time-domain curved surface staircase error boundary condition equation
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高阶SF-SFDTD方法在含时薛定谔方程求解中的应用研究
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作者 谢国大 潘攀 +4 位作者 任信钢 冯乃星 方明 李迎松 黄志祥 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第3期72-81,共10页
时域有限差分方法(finite-difference time-domain,FDTD(2,2))被广泛用于量子力学中薛定谔方程的求解,然而受Courant-Friedrichs-Lewy(CFL)条件的影响,计算空间中的网格尺寸会限制时间步长的取值范围,极大降低了FDTD(2,2)方法的数值计... 时域有限差分方法(finite-difference time-domain,FDTD(2,2))被广泛用于量子力学中薛定谔方程的求解,然而受Courant-Friedrichs-Lewy(CFL)条件的影响,计算空间中的网格尺寸会限制时间步长的取值范围,极大降低了FDTD(2,2)方法的数值计算效率.另外,FDTD(2,2)方法在时间域和空间域只具有二阶数值精度,在计算中往往会导致较大的误差累计,影响仿真结果的正确性.为了克服这些问题,结合空间滤波方法(spatial filtering,SF)和高阶辛时域有限差分(symplectic finite-difference time-domain,SFDTD(3,4))方法(3和4分别表示时间和空间数值精度),提出了一种时间稳定性条件可扩展的SF-SFDTD(3,4)方法用于求解含时薛定谔方程.SF-SFDTD(3,4)方法无需对传统SFDTD(3,4)方法的迭代公式进行进一步的推导,只需要在每一次的数值迭代过程中加入空间滤波操作,滤除因采用不满足CFL条件的时间步长而产生的不稳定空间域高频分量,保证数值方法的稳定性,因此所提方法与传统SFDTD(3,4)方法具有较高的兼容性.同时,理论分析了SF-SFDTD(3,4)方法的数值色散误差.最后,通过数值算例验证了本文所提方法的正确性和有效性. 展开更多
关键词 辛时域有限差分方法 空间滤波方法 时间稳定性条件 薛定谔方程
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基于HIE-FDTD方法的电磁热耦合分析快速计算方法研究
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作者 牟春晖 陈娟 《现代应用物理》 2024年第1期116-125,共10页
基于混合显隐式时域有限差分(hybrid implicit-explicit finite-difference time-domain,HIE-FDTD)方法,提出了一种电磁热耦合分析快速计算方法。仿真电磁场时,采用HIE-FDTD方法求解Maxwell旋度方程;计算温度场时,采用时域有限差分(fini... 基于混合显隐式时域有限差分(hybrid implicit-explicit finite-difference time-domain,HIE-FDTD)方法,提出了一种电磁热耦合分析快速计算方法。仿真电磁场时,采用HIE-FDTD方法求解Maxwell旋度方程;计算温度场时,采用时域有限差分(finite-difference time-domain,FDTD)方法求解热传导方程。由于HIE-FDTD方法只对1维空间偏导数采用隐式差分方法进行离散,因此时间步长不受电磁目标精细结构所在方向网格大小的限制。采用电磁热耦合分析快速计算方法对十字缝隙频率选择表面的电磁热耦合效应进行分析,并将仿真结果与采用传统FDTD方法、CST软件以及COMSOL软件的仿真结果进行对比,所有结果均相互符合。十字缝隙频率选择表面算例结果表明:在保证计算精度的前提下,采用HIE-FDTD方法的仿真时间仅为传统FDTD方法仿真时间的1/6,有效提高了电磁热耦合仿真的计算效率。 展开更多
关键词 混合显隐式时域有限差分 多物理场 电磁热耦合分析 热传导方程 频率选择表面
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基于ADI-FDTD法的探地雷达正演数值模拟及验证
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作者 曾良生 迟耀丹 +1 位作者 周庆才 衣淼 《吉林建筑大学学报》 CAS 2024年第1期48-55,共8页
探地雷达(GPR)是一种应用前景广泛、用于探测和定位地下物体的浅层地球物理方法。通过开展探地雷达正演模拟研究,可以获得复杂地下结构的探地雷达图像回波特征。时域有限差分(FDTD)法受到稳定性和收敛性条件的限制,导致效率和精度低。... 探地雷达(GPR)是一种应用前景广泛、用于探测和定位地下物体的浅层地球物理方法。通过开展探地雷达正演模拟研究,可以获得复杂地下结构的探地雷达图像回波特征。时域有限差分(FDTD)法受到稳定性和收敛性条件的限制,导致效率和精度低。交替方向隐式-时域有限差分(ADI-FDTD)法克服FDTD法的稳定性限制,可以选择更大的时间步长来提高计算效率。从原理出发,对ADI-FDTD法进行公式推导,在基于ADI-FDTD法的基础上进行卷积完全匹配层(CPML)的结合。通过进行ADI-FDTD法的时间稳定性仿真和不同材质、不同填充介质的双管,沙槽正演模拟实验,结果表明,ADI-FDTD法可以保证时间无条件稳定性,相同情况下可采用更大的时间步长进行正演模拟,提高正演效率。对不同管线、不同材质情况下的正演剖面曲线特征进行解译分析,最后与沙槽实测进行对比,证明得到的探测解译结果与实际状况达到较好的吻合。 展开更多
关键词 探地雷达(GPR) 正演模拟 无条件稳定 卷积完全匹配层(CPML) 交替方向隐式-时域有限差分(ADI-fdtd)法
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融合FDTD与遗传算法的高精度光学薄膜优化
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作者 许韫诗 李纪风 戴志平 《现代信息科技》 2024年第10期165-167,171,共4页
该研究提出一种融合时域有限差分法(FDTD)和遗传算法的优化框架,旨在提高光学薄膜的反射性能。选择三层薄膜结构作为研究对象,通过使用FDTD方法计算薄膜结构的反射率,并将其作为遗传算法中的适应度函数。通过两者结合,在多维设计空间中... 该研究提出一种融合时域有限差分法(FDTD)和遗传算法的优化框架,旨在提高光学薄膜的反射性能。选择三层薄膜结构作为研究对象,通过使用FDTD方法计算薄膜结构的反射率,并将其作为遗传算法中的适应度函数。通过两者结合,在多维设计空间中有效搜索到了优化参数,显著降低了薄膜的反射率。这一方法不仅降低了计算成本,还提供了一种灵活且可扩展的解决方案,对未来高性能光学系统的设计和优化具有重要的实际意义。 展开更多
关键词 光学薄膜 时域有限差分法 反射率 遗传算法 设计优化
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High-Order Spatial FDTD Solver of Maxwell’s Equations for Terahertz Radiation Production
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作者 Abdelrahman Mahdy 《Journal of Applied Mathematics and Physics》 2024年第4期1028-1042,共15页
We applied a spatial high-order finite-difference-time-domain (HO-FDTD) scheme to solve 2D Maxwell’s equations in order to develop a fluid model employed to study the production of terahertz radiation by the filament... We applied a spatial high-order finite-difference-time-domain (HO-FDTD) scheme to solve 2D Maxwell’s equations in order to develop a fluid model employed to study the production of terahertz radiation by the filamentation of two femtosecond lasers in air plasma. We examined the performance of the applied scheme, in this context, we implemented the developed model to study selected phenomena in terahertz radiation production, such as the excitation energy and conversion efficiency of the produced THz radiation, in addition to the influence of the pulse chirping on properties of the produced radiation. The obtained numerical results have clarified that the applied HO-FDTD scheme is precisely accurate to solve Maxwell’s equations and sufficiently valid to study the production of terahertz radiation by the filamentation of two femtosecond lasers in air plasma. 展开更多
关键词 The finite-difference-time-domain Terahertz Radiation Production Filamentation of Femtosecond Laser Maxwell’s Equations Solution
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基于FDTD与GO结合算法的非规则地形电磁脉冲环境研究 被引量:1
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作者 杨超 翟鑫洋 +1 位作者 任泽平 陈再高 《现代应用物理》 2023年第1期117-123,144,共8页
对于宽频带电磁脉冲入射波,如高空电磁脉冲,单独使用数值分析或高频近似方法解决地面的电磁散射问题均具有局限性。针对该问题,采用时域有限差分和几何光学相结合的方法可有效仿真非规则地形的电磁脉冲环境,与单独使用时域有限差分方法... 对于宽频带电磁脉冲入射波,如高空电磁脉冲,单独使用数值分析或高频近似方法解决地面的电磁散射问题均具有局限性。针对该问题,采用时域有限差分和几何光学相结合的方法可有效仿真非规则地形的电磁脉冲环境,与单独使用时域有限差分方法相比,仿真尺度有大幅提升。对于结合算法中的时域有限差分方法,采用基于广义总场散射场的时域有限差分方法,而非传统时域有限差分方法,有效减小了地面截断产生的边缘效应。通过水平地面仿真验证了方法的正确性,并给出了非规则地形(山体)的电磁脉冲环境。 展开更多
关键词 时域有限差分 广义总场散射场 几何光学 电磁脉冲环境 非规则地形
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