摘要
为解决传统时域有限差分方法计算三维弯曲拖曳细天线辐射场时精细网格离散计算空间造成消耗内存大和计算时间超长的难题,本文利用时域电流-电荷连续性控制方程和电偶极子近似模型快速计算三维弯曲细天线的甚低频辐射场。首先,通过仿真计算得到三维弯曲细天线上的电流分布和输入阻抗的频谱特性;然后,结合细天线上电流的分布特征将弯曲细天线分成若干物理单元,并考虑甚低频波段波长的特点将每一个物理单元近似为电偶极子辐射源;最后,利用矢量叠加原理得到沿弯曲细天线分布的若干电偶极子源在自由空间、半空间单层地面与双层地面、受限空间内的辐射场。利用该方法计算了物理长度为6 km工作频率为25 kHz的弯曲拖曳细天线的甚低频电流分布及在空气中的辐射场。
In order to address the challenges of extensive memory consumption and prolonged computation time associated with the traditional finite-difference time-domain method for calculating the radiation field of a three-dimensional curved towed thin-wire antenna,this paper employs the time-domain current-charge continuity equation and dipole approximation to efficiently compute the very low frequency radiation field of such antennas.Through simulation,the current distribution and frequency-domain input impedance characteristics of the three-dimensional curved thin-wire antenna are obtained.By analyzing the current distribution along the antenna,the curved thin-wire antenna is divided into several physical segments.Considering the wavelength characteristics of the VLF band,each segment is approximated as an electric dipole radiation source.Using the principle of vector superposition,the radiation fields from these dipole sources distributed along the curved thin-wire antenna are calculated in the free space and half-space,above single-layer and double-layer formation,and within confined spaces.Finally,this method is applied to compute the VLF current distribution and the radiation field in air for a 6 km long curved towed thin-wire antenna operating at 25 kHz.
作者
毛云志
郭占曹
郑奎松
张世田
杨铭月
MAO Yunzhi;GUO Zhancao;ZHENG Kuisong;ZHANG Shitian;YANG Mingyue(National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107,China;School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710129,China)
出处
《电波科学学报》
北大核心
2025年第3期473-482,共10页
Chinese Journal of Radio Science
基金
国家自然科学基金(61971351)
电波环境特性及模化技术重点实验室基金(6142403240304,6142403240202)
中国电波传播研究所稳定支持科研经费(A132301213)。
关键词
拖曳细天线
时域有限差分
电偶极子近似
甚低频
辐射场
towed fine antenna
time-domain finite-difference
dipole approximate
very low frequency
radiated fields
