Solid tide response removing method based on improved variational mode decomposition

Abstract

The invention relates to a solid tide response removing method based on improved variational mode decomposition. The method comprises the following steps: inputting data collected by a ground instrument and carrying out data preprocessing; calculating the frequency spectrum of the data, comparing the frequency characteristics of the earth tide response, and determining the influence range of the earth tide response on the data in the frequency domain; determining a frequency segmentation point f according to the influence range of the earth tide response on the frequency domain; constraining the estimated center frequency of variational mode decomposition according to the frequency segmentation point f; decomposing the data by adopting a central frequency constrained variational mode decomposition method, finding out optimal components under different central frequency constraint conditions to obtain various modes, and arranging the decomposed modes from small to large according to the central frequency of the modes; and removing the earth tide response mode in each mode. The method solves the problem that it is difficult to effectively remove periodic response generated by earth tide in a frequency domain on the basis of not damaging frequency characteristics of different source signals in observation data in an existing method.

Description

technical field [0001] The invention belongs to the field of solid tidal response removal in ground observation data, in particular to a method for removing solid tidal response based on improved variational mode decomposition. Background technique [0002] Ground observation refers to the direct measurement of the local parameter values ​​near the surface at a certain point on the ground by special instruments. At present, ground observation technology is widely used in meteorological monitoring, hydrological monitoring and earthquake monitoring and other fields. With the advancement of science and technology, the research on ground observation instruments has developed rapidly, and the accuracy and stability of the instruments have been greatly improved. However, the ground observation data will still be interfered by external signals, which seriously affects the identification and extraction of the real information of the observation target. Solid tide refers to the per...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for removing solid tidal responses based on improved variational mode decomposition, which solves the problem that existing methods are difficult to achieve in the frequency domain without destroying the frequency characteristics of different source signals in the observation data. Periodic response generated by effective removal of solid tide

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