物理含义：能量信号的自相关函数与能量谱密度函数构成傅立叶变换对。
Physical meaning: the self-correlation function and the energy spectrum density function compose a Fourier transform pair.
上式表明： 功率型信号的自相关函数与其功率谱密度函数构成傅立叶变换对。
Meaning: The self-correlation function and power spectrum density Function of a power-typed signal compose a FT pair.
应用伽利略变换对简化后的方程进行变量变换，使得曲面函数仅与空间相关；
The Galilean transformation was applied to the simplified equation to make a surface function related to only coordinates.
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