直接从时间域出发，应用时域有限差分方法(FDTD)分析地下和地面的瞬变响应。
In this paper we analyze the transient responses directly in frequency domain using time domain difference (FDTD).
应用时域有限差分（FDTD）方法分析甚低频在地电离层波导中的传播特性。
The propagation characteristic of the VLF in the earth-ionosphere waveguide is analyzed by applying the FDTD method.
应用时域有限差分（FDTD）方法分析甚低频在地电离层波导中的传播特性。
The propagation characteristic of the VLF in the earth-ionosphere waveguide is analyzed by applying the FDTD method.
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