Based on the method of FDTD, two special boxes were constructed to calculate the far area radiation field.

在FDTD分析方法的基础上，构造出两个特殊盒子来计算远区辐射场。

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But the demand of recording far-field wavelet can't be met when water depth is only tens meters in ultra-shallow sea area.

但是在水深只有几十米的极浅海海域，无法满足记录远场子波的要求。

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