Method for removing colored noise in time series of GPS coordinates

Abstract

The invention provides a method for removing colored noise in the GPS coordinate time sequence. The method comprises steps that S1, a residual sequence of the GPS base station coordinate time sequenceis obtained, and the variance of white noise in the residual sequence is estimated; S2, the white noise is simulated according to the variance of the white noise; S3, the simulated white noise and the residual sequence are simultaneously subjected to wavelet decomposition; S4, an information entropy of wavelet coefficients of the simulated white noise and the information entropy of wavelet coefficients of the residual sequence are obtained; S5, the information entropy of the wavelet coefficients of the colored noise is obtained; S6, wavelet coefficients of the colored noise are obtained according to the information entropy of the wavelet coefficients of the colored noise; S7, the wavelet coefficients of the colored noise are reconstructed to obtain the colored noise; and S8, the obtainedcolored noise is subtracted from the GPS coordinate time sequence, and the time sequence that is unaffected by the colored noise is finally obtained. The method is advantaged in that influence of thecolored noise in the GPS coordinate time sequence can be effectively removed, and non-linear motion characteristics of the GPS coordinate time sequence are preserved.

Description

technical field [0001] The invention relates to the field of GPS data processing, in particular to a method for removing colored noise in GPS coordinate time series. Background technique [0002] GPS reference station coordinate time series are widely used in geodesy and geodynamics research. It can provide basic data for studying the temporal and spatial changes of crustal movement, structural deformation characteristics and other scientific issues. Due to various factors including the geophysical environment and systematic errors related to GPS technology, the GPS station coordinate time series contains white noise and colored noise (error). Since the noise in the GPS coordinate time series affects the stability and reliability of the station coordinates and leads to wrong interpretation of some geophysical phenomena, it is necessary to take measures to weaken the noise intensity of the GPS coordinate time series. However, the current denoising methods cannot remove the ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for removing colored noise in GPS coordinate time series, which is intended to solve the problem that existing methods for removing noise in GPS coordinate time series cannot effectively remove colored noise from GPS coordinate time series The problem

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