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A method for obtaining surface tidal displacement and its 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: 2022-02-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
  • Claims
  • 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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  • A method for obtaining surface tidal displacement and its application method and system
  • A method for obtaining surface tidal displacement and its application method and system
  • A method for obtaining surface tidal displacement and its application method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Surface tidal displacement d in this embodiment OTL 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 oce...

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 a method for acquiring surface tidal displacement based on GPS and an empirical tidal model, an application method and a system. The method includes: based on a tidal harmonic analysis method, using an empirical tidal model to calculate the harmonic parameters of the tidal division, and a GPS reference website based on Observe the data and use the PPP measurement technology to calculate the harmonic parameters of the tidal division; then use the calculated harmonic parameters to construct a sample data set, and introduce machine learning for network training to obtain the prediction model corresponding to the target tidal division; finally use the tidal displacement correction model to get the surface The tidal displacement of the target tidal displacement in the tidal displacement correction model is calculated by using the prediction model; other tidal displacements are calculated by the empirical tidal model. In summary, a high-precision and high-efficiency tidal displacement correction model is established, which is suitable for high-precision, large-scale 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 Patents(China)
IPC IPC(8): G06F30/27G06N20/10
CPCG06F30/27G06N20/10
Inventor 彭葳
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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