Method for removing colored noise in GPS coordinate time sequence

A coordinate time series, colored noise technology, applied in the field of GPS data processing, can solve the problem that colored noise cannot be effectively removed

Active Publication Date: 2019-05-03
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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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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  • Method for removing colored noise in GPS coordinate time sequence
  • Method for removing colored noise in GPS coordinate time sequence
  • Method for removing colored noise in GPS coordinate time sequence

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[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] Such as figure 1 As shown, the embodiment of the present invention provides a method for removing colored noise in GPS coordinate time series, which is characterized in that it includes the following steps:

[0046] S1, obtain the residual sequence of the coordinate time series of the GPS reference station, and estimate the variance (or amplitude) of the white noise in the residual sequence;

[0047] S2, simulating white noise according to the variance...

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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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37
Inventor 马俊曹成度姜卫平
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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