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Earth surface tide displacement obtaining method based on GPS and empirical tide model, and application method and system

A tide and displacement technology, applied in the direction of nuclear method, design optimization/simulation, etc., can solve the problems of limited number of GPS observation stations, limited application space, limited monitoring range, tidal load displacement calculation efficiency, etc., to improve measurement accuracy and overcome quantity Constraints and the effect of improving the measurement speed

Active Publication Date: 2021-12-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of GPS observation stations is limited, so a certain program limits its application space, especially in the face of large-scale surface deformation monitoring applications in coastal space, the number of GPS observation stations limits the monitoring range and the calculation efficiency of tidal load displacement

Method used

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  • Earth surface tide displacement obtaining method based on GPS and empirical tide model, and application method and system
  • Earth surface tide displacement obtaining method based on GPS and empirical tide model, and application method and system
  • Earth surface tide displacement obtaining method based on GPS and empirical tide model, and application method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Surface tidal displacement in this example Expressed as:

[0070]

[0071] in, Represents Q1, O1, N2, M2 tidal displacements with high estimation accuracy by dynamic PPP method; Represents the K2, K1, P1 tidal displacements estimated by the ocean tide loading model.

[0072] In this embodiment, the sum of the tidal displacements of the seven main tidal divisions of Q1, O1, N2, M2, K2, K1, and P1 is used as the surface tidal displacement. In other feasible embodiments, other tidal divisions can also be added Displacement, which is not specifically limited in the present invention. Wherein, the present invention obtains Q1, O1, N2, M2 tidal displacement with dynamic PPP method, is about to set Q1, O1, N2, M2 tidal as the target tidal in this embodiment, in other feasible embodiments, can be to It can be adjusted, and the present invention does not specifically limit it.

[0073] Dynamic PPP technology: It can be used to determine the displacement of ocean tidal...

Embodiment 2

[0094] This embodiment provides an application method based on the above method for obtaining surface tidal displacement, which is applied to correcting the differential interferogram, which includes: using the tidal displacement correction model to obtain the surface tidal displacement, and the surface tidal displacement is the ocean tide load displacement Correcting the data; and then using the surface tidal displacement to correct the tidal load displacement corresponding to the corresponding pixel position in the differential interferogram.

Embodiment 3

[0096] This embodiment provides a system based on the above-mentioned method for obtaining surface tidal displacement, which includes:

[0097] Empirical tidal model calculation module, using the empirical tidal model to calculate the harmonic parameters of tidal;

[0098] PPP measurement technology calculation module, based on the observation data of the GPS reference website and using the PPP measurement technology to calculate the harmonic parameters of the tide;

[0099] Prediction model construction module, using the harmonic parameters calculated by the empirical tidal model and the harmonic parameters calculated by the PPP measurement technology to construct a sample data set, and introducing machine learning to carry out network training to obtain the corresponding prediction model of the target tide;

[0100] The tidal displacement correction value calculation module uses the tidal displacement correction model to obtain the surface tidal displacement.

[0101] In so...

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Abstract

The invention discloses an earth surface tide displacement obtaining method based on a GPS and an experience tide model, and an application method and system, and the method comprises the steps: calculating harmonic parameters of partial tide through employing the experience tide model based on a tide harmonic analysis method, and calculating harmonic parameters of partial tide through employing a PPP measurement technology based on observation data of a GPS reference website; constructing a sample data set by using the calculated harmonic parameters, and introducing machine learning to carry out network training to obtain a prediction model corresponding to the target partial tide; and finally, obtaining surface tidal displacement by utilizing a tidal displacement correction model, wherein the partial tide displacement of the target partial tide in the surface tidal displacement correction model is calculated by utilizing a prediction model or utilizing a PPP measurement technology, and other partial tide displacements are calculated by adopting an empirical tide model. In conclusion, a high-precision and high-efficiency earth surface tide displacement correction model is established, and the method is suitable for high-precision and large-range InSAR deformation measurement.

Description

technical field [0001] The invention belongs to the technical field of surface deformation monitoring, and in particular relates to a method for obtaining surface tidal displacement based on GPS and an empirical tidal model, an application method and a system. Background technique [0002] Synthetic aperture differential interferometry technology has been widely used in ground deformation measurement. As the spatial scale increases, the displacement of solid tides and ocean tidal loads measured by InSAR differential interferometry also increases. Solid tides and ocean tidal loading effects are the elastic responses of the solid Earth to the gravitational changes of the sun and moon and the redistribution of ocean mass, both of which are nonlinear spatial large-scale signals. Previous studies have shown that in the DInSAR interferogram of ERS1 / 2 and ENVISAT ASAR data, the ocean tidal load is usually ignored at the 100km-level swath scale. The Sentinel-1A / B mission provides d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27G06N20/10
CPCG06F30/27G06N20/10
Inventor 彭葳
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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