In fact, the FFT spectrum is the convolution between read time series and window function in domain of frequency, the dominant frequency position influence on leakage should not be ignored.
由于实际信号和窗函数在频域为卷积关系，所以应该考虑实际频率在FFT谱上所处的位置。
Then the waveforms in the window are performed with FFT and the formation wave energy is calculated in frequency domain.
然后对时窗内的波形作快速傅立叶变换，在频域内求地层波能量。
The measuring accuracy has been improved due to adopting Inverse Fourier Transform based on adding window in frequency domain.
同时为了减少时域响应的泄漏，进一步提高测量精度，采用了基于频域加窗的逆傅里叶变换；
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