The image reconstruction problem of linear attenuation coefficients is very difficult and central in transmission TGS.

在TGS透射测量中，线性衰减系数值的图像重建问题是TGS的难点和核心问题。

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If a proper non - linear change of the instantaneous frequency is realized, we can get a frequency spectrum whose input is the mean of the reciprocals of bed attenuation coefficients.

如果把瞬时频率作适当的非线性变化，就可以得到一个以地层衰减率的倒数的平均值为输入的频谱。

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