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《Chinese Journal of Geophysics》 1992-01
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DETERMINATION OF THE GROUND DISPLACEMENT USING FFT AND MODERN CONTROL ENGINEERING

LI HONG-JI(Institute of Geophysics, State Seismological Bureau, Beijing 100081)  
It is possible to yield incorrect results including false long period components, during the restitution of the ground displacement from digital seismograms directly using FFT. An iteration technique based on FFT and modern control engineering is presented. Comparing the recovered results of FFT with the displacement obtained by the iteration method shows that the approach proposed in this paper indeed improves the estimation of the ground displacement.
【Fund】: 地震科学联合基金
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