Analysis of the Disturbance Characteristics of Atmospheric Pressure on the Deformation Data of North Wudang Observation Station Based on EEMD Decomposition Method
By selecting typical events with significant atmospheric pressure interference in the horizontal pendulum,water pipe instrument,and telescopic instrument observation data at the North Wudang Observation Station,this paper analyzes and studies how atmospheric pressure changes affect the observed data changes;using Set Empirical Mode Decomposition(EEMD)to extract the Intrinsic Mode Function(IMF)components containing interference information from the original observation data;performs Hilbert transform on the IMF components to obtain the Hilbert time-frequency map.The results show that the horizontal pendulum and telescopic instrument are significantly affected by air pressure interference,while the water pipe instrument is less affected by air pressure interference,and the air pressure interference has a time delay.In summary,the analysis of the direction finding data from the North Wudang Observation Station using the EEMD method shows that this method has a good effect on the study of atmospheric pressure interference and improves the ability to identify interference information.
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