地基VLF天线体积庞大、能耗惊人，易受攻击。星载VLF天线尺寸小、机动性强，辐射范围广。因而对星载VLF天线研究具有重要的战略意义。由于难以进行实验研究，电离层背景VLF天线的仿真分析成为该领域的研究热点。复杂电离层背景（各向异性色散介质）下波长与天线纵向几何尺寸的巨大差异使得采用数值算法对相关问题分析面临许多困难，传统算法往往难以满足计算需求。本项目拟发展十多年来得到广泛关注的时域非连续伽略金（DGTD）法，使之适用于各向异性色散介质背景天线电磁特性的分析需要。进一步研究基于高阶叠层型基函数的DGTD大规模并行计算方法，提升算法效率，拓展其应用范围。最后，结合传输线理论给出电离层中的线状VLF天线的阻抗特性、电流分布及传播特性的计算方案。本项目研究成果将为星载VLF天线的设计分析提供依据，推进相关数值算法的研究，并为进一步的复杂天线仿真分析打下基础。

The ground-based VLF antenna has disadvantages of huge equipment, high energy consumption, and being vulnerable to attack. Characterized by small volume, strong mobility, and high efficiency, the study on the spaceborne VLF antennas has significant strategic importance. Considering the difficulty of experimental researches, the numerical simulation of the spaceborne VLF antenna in the ionosphere has been a hotspot in this field. In the ionosphere (anisotropic dispersive medium), the huge difference between the wavelength and the longitudinal size of the antenna make it difficult to analyze the related problems by numerical methods, and traditional numerical methods generally cannot meet the requirements. This project intends to develop the discontinuous Galerkin time-domain (DGTD) method that has gained increasing popularity in more than a decade. The DGTD method will be extended to handle the anisotropic dispersive medium and analyze VLF antenna in this backgound. Furthermore, the parallel DGTD algorithm based on high-order hierachical basis functions will be studied to improve the efficiency and expand its application. Finally, combined with the transmission line theory, the scheme will be presented for calculation of the impedance characteristic, current distribution and propagation characteristic of the VLF antenna in the ionosphere. The results of this project will act as foundation for the design of spaceborne VLF antennas, as well as boosting the research of related numerical methods. It lays the foundations for further simulation of complex antennas.