By using one-dimension FDTD method we simulates the decay of double exponential pulse through the soil media, and its refractive time-domain wave shape is discussed in detail.

用一维FDTD方法模拟了双指数脉冲在单层岩土介质中的衰减，并对电磁波在岩土层中的穿透进行了详细的讨论。

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Using this method the side-lobe level is suppressed more through double weighting in time domain.

采用双加权的失配处理分析方法，在时域进一步降低压缩脉冲的旁瓣电平。

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Proton NMR two dimensional time-domain data are collected based on the inversion-recovery technique. Double Fourier transformation of those data yields the two dimensional frequency-domain data.

基于反转恢复法建立质子nmr二维时域数据，经双重付里叶变换获得二维频域数据。

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