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A Tropospheric Chromatography Method Involving Spatiotemporal Parameters of Water Vapor

A technology of spatiotemporal parameters and troposphere, applied in special data processing applications, instruments, ICT adaptation, etc., can solve the problems of insufficient precision of interpolation methods, and achieve the goal of improving the accuracy of tomographic modeling, accurate determination, and improving the accuracy of tomographic solutions Effect

Active Publication Date: 2022-03-04
CENT SOUTH UNIV
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Problems solved by technology

[0010] Based on the parametric tropospheric tomography model, the present invention develops an improved tropospheric tomography parameterization method for the problem of insufficient precision of its interpolation method, in which the wet refractive index varies with the spatial position and its value is determined by the voxel The weighted sum interpolation of the eight nodes is obtained, the horizontal direction adopts inverse distance weighted interpolation, and the vertical direction adopts exponential interpolation, and the parameters required by the interpolation method are obtained according to the real-time estimation of the tomographic wet refractive index field

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  • A Tropospheric Chromatography Method Involving Spatiotemporal Parameters of Water Vapor
  • A Tropospheric Chromatography Method Involving Spatiotemporal Parameters of Water Vapor
  • A Tropospheric Chromatography Method Involving Spatiotemporal Parameters of Water Vapor

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Embodiment Construction

[0043] According to the spatial variation characteristics of water vapor, the present invention obtains the wet refractive index of any point on the troposphere space from the weighted summation of the eight nodes of the voxel where it is located. The horizontal direction adopts inverse distance weighted interpolation, and the vertical direction adopts exponential interpolation. The required parameters are obtained according to the dynamic estimation of the tomographic wet refractivity field, which overcomes the defect of not considering the space-time parameters of water vapor in previous modeling, and refines the parameterized tropospheric tomography model. Its principle and process are as follows:

[0044] Along the ray path from the GNSS satellite to the receiver, SWD and wet refractive index N w The relationship between them can be expressed as:

[0045] SWD = ∫ l N w d l (1)

[0046] Such as figure 1 As shown, l is the oblique path in SWD. Based on the spatially...

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Abstract

The invention provides a tropospheric tomography method involving water vapor spatiotemporal parameters. In the method, the wet refractive index varies with the spatial position and its value is obtained by weighted summation and interpolation of eight nodes of the voxel. The horizontal direction adopts inverse distance weighting. Interpolation, the vertical direction adopts exponential interpolation, and the parameters required by the interpolation method are obtained according to the real-time estimation of the tomographic wet refractive index field. On the basis of the existing parametric tomographic model, the present invention improves the precision of tomographic modeling through the interpolation method of the refined parametric tomographic model. Especially when the grid division is large or the water vapor space changes drastically, the improved parameterization method proposed by the present invention can construct a tropospheric tomographic model more accurately.

Description

technical field [0001] The invention relates to the field of geophysics, in particular to a tropospheric tomography method involving water vapor spatiotemporal parameters. Background technique [0002] The troposphere is the layer of atmosphere closest to the earth's surface, and it is also the densest layer in the earth's atmosphere, containing about 75% of the mass of the entire atmosphere, as well as almost all water vapor and aerosols. Tropospheric tomography is an inversion calculation based on the wet delay information obtained by ray scanning, and reconstructs a three-dimensional image of the distribution of wet refractive index within the measured troposphere. Among them, the wet delay means that when the electromagnetic wave signal passes through the troposphere, its signal is bent by the refraction of water vapor, and the propagation path becomes longer than the geometric distance, so the propagation speed becomes slower. This is called the delay of the electromagn...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/37G01W1/00G06F30/20
CPCG01S19/37G01W1/00G06F30/20Y02A90/10
Inventor 陈必焰
Owner CENT SOUTH UNIV