摘要
提出一种带角点的细导线模型和传统FDTD相结合的方法分析加载斜拉式线天线目标散射特性。为进一步减小目标离散时的台阶化误差和节省计算资源 (内存和时间 ) ,给出一种简化的共形FDTD(SCFDTD)算法。通过坐标旋转使天线长段平行于某固定坐标轴 ,然后建立带有角点的细导线FDTD模型。以变形网格面积与正常网格面积之比 1/ 6作为SCFDTD算法的判据 ,既简化了已有CFDTD算法的复杂度 ,又不失其物理意义。与传统FDTD方法和实验测量结果对比数值计算例子表明了该方法的可行性与有效性。
A combined technique of coordinate circumvolve, thin wire FDTD model and a simplified CFDTD scheme is presented to analyze the EM scattering of target with an attached wire. The coordinate transform is employed to let the attached wire along a coordinate axis, then the thin wire FDTD model can be constructed. With a radio of 1/6 (the distorted cell area to the regular cell area) as a criterion, a simplified conformal FDTD (SCFDTD) scheme is proposed to overcome staircase error. To show the validity and applicable of the presented technique, the computed RCS's are compared with that from the conventional FDTD and measured values.
出处
《电波科学学报》
EI
CSCD
2004年第1期21-26,共6页
Chinese Journal of Radio Science
关键词
FDTD方法
细导线模型
共形FDTD技术
加载天线目标
时域有限差分
Electromagnetic wave scattering
Finite difference method
Mathematical models
Numerical analysis
Radar target recognition
Time domain analysis
