ACMART method for GNSS ionosphere chromatography

Abstract

The invention discloses an ACMART method for GNSS ionosphere chromatography. The method comprises the following steps: S1, building a new iterative model through the multiplication of the intercept ofa ray passing through a grid and the electron density of the grid, and redistributing an error between a measured value and an inversion value of the total electron content of an ionosphere in gridswith different electron densities; S2, developing a self-adaptive iteration factor; and S3, carrying out smooth constraint according to the continuity and smoothness distribution characteristics of the electron density of the ionized layer between the adjacent grids. The method has important application value in GNSS navigation positioning precision improvement and disaster reduction and prevention capability of the space environment.

Description

technical field [0001] The invention relates to GNSS ionosphere chromatography technology, in particular to an ACMART method suitable for GNSS ionosphere chromatography. Background technique [0002] At present, ionospheric tomography is a multi-dimensional ionospheric detection technology that can effectively invert ionospheric electron density. In 1986, Austen et al. first proposed the idea of ​​ionospheric tomography technology: using multiple satellite ground stations to measure the total electron content (Total Electron Content, TEC) of the ionosphere on the propagation path, and using tomography technology to reconstruct the ionospheric The two-dimensional electron density distribution of the ionosphere, after which many experiments and theoretical studies on this idea have been carried out in the world, and the reconstruction of the three-dimensional and even four-dimensional ionosphere structure has been realized, which can not only reflect the horizontal structure c...

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Problems solved by technology

[0007] Ionospheric tomography distributes the error between the measured value and the retrieved value of the ionospheric total electron content according to the weight ratio of the intercept. However, this method only uses the ray intercept as the only basis for error distribution, and does not consider Effect of grid electron density on the model;

[0008] The iterative relaxation factor of this method is a fixed constant, which leads to the unbalanced propagation of noise errors in different electron density grids, which affects the accuracy of ionospheric tomography inversion;

[0009] For grids that do not have any rays passing through the tomographic area, after iteration convergence, the electron density values ​​of these grids are consistent with the initial values ​​given by the prior model, which affects the accuracy of ionospheric tomographic inversion

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