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提出一种基于富里叶变换线性性实现时变滤波的方法，该方法可提高某些在传播过程中随着传播时间增加其高频成分逐渐减少的接收信号的信噪比。
A method of time-varying filtering based on linearity of Fourier transform is proposed. This method can improve the signal-to-noise ratio (SNR) of the received signal with decreasing high-frequency components as propagation time increases.