摘要
给出了基于Fock电流和增量长度绕射系数技术(Incremental Length Diffraction Coefficients,ILDC)得到的三维凸圆柱上的高频散射场的表达式,应用路径变换法和数值最速下降路径(Numerical Steepest Descent Path,NSDP)方法计算基于Fock电流的高振荡积分,得到散射场.数值算例显示,使用这一方法计算高频散射场,可以实现在不同频段的入射波下计算时间与频率无关.并给出一种基于测地线性质的爬行波寻迹算法,具有较高的精度和更高的计算效率,适用于任意光滑模型上爬行波的寻迹.
In this paper, we compute the high frequency scattered field based on the Fock current and incremental length diffraction coefficients （ILDC） technique. However, a high oscillatory integration occurs when the high-frequency scattered field is calculated by the Fock current. So, we calculate the highly oscillatory physical optics integral by the contour deformation method and the numerical steepest descent path （NSDP） method. Numerical examples illustrate that the proposed NSDP method for calculating the high frequency scattered fields could achieve the frequency independent computational workload. Furthermore, we propose a creeping wave ray tracing algorithm based on geodesic curve. It achieves high accuracy and computational efficiency, and it can be applied to creeping wave ray tracing on models of arbitrary shapes.
作者
杨杨
朱劼
邹宁
张楠
杨丹枫
吴语茂
YANG Yang ZHU Jie ZOU Ning ZHANG Nan YANG Danfeng WU Yumao(Key lab for Information Science of Electromagnetic Waves of Ministry of Education （MoE） , School of Information Science and Technology, Fudan University, Shanghai 200433, Chin)
出处
《电波科学学报》
CSCD
北大核心
2017年第2期199-206,共8页
Chinese Journal of Radio Science
基金
国家自然科学基金(61401103)
上海国家自然科学基金(14ZR1402400)
毫米波国家重点实验室(K201505)
关键词
路径变换法
爬行波
Fock电流
数值最速下降路径法
测地线
contour deformation method
creeping wave
Fock current
numerical steepest descentpath method
geodesic curve
