In a head-on collision, a rear-facing car seat spreads the energy of the crash across the toddler's entire back, not just across a narrow portion of a tiny body.

在正面相撞中，后朝向座位会使冲击力分散在婴幼儿的整个后方，而不是他小小的躯体上很窄的一部分。

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The time-domain filter can then be used to select the narrow central portion of the cross correlation function (CCF), capturing virtually all of the signal but rejecting most of the noise.

对相关函数进行时域滤波，挑选出互相关函数中窄信号自相关函数部分，去掉剩余的大部分噪声能量，得到加窗互相关函数（CCF）。

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