Accurate modeling method suitable for regional ionosphere TEC

Abstract

The invention discloses an accurate modeling method suitable for regional ionosphere TEC and belongs to the technical field of positioning systems. According to the method, original oblique ionospheretime delay TEC is acquired; the oblique TEC is converted into vertical TEC by means of an inclination factor; a radial basis function with a multi-multivariate quadratic function adopted as a basis function is built according to the longitude and latitude of an observation sample, and the corresponding vertical TEC; a linear matrix equation is constructed with the continuous radial basis function; optimal coefficients are resolved; a linear matrix equation set is reconstructed through the optimal coefficients; and the accurate ionosphere time delay prediction values of various grid points ora given position are obtained. The accurate modeling method provided by the invention not only can provide data support for the theoretical research of ionosphere morphology, but also provides accurate ionosphere refraction correction values for the majority of GNSS single-frequency users. With the method of the invention adopted, the problem of navigation positioning precision reduction due to data missing is solved, and the service performance of a space application system which uses radio as a transmission beacon is further improved.

Description

technical field [0001] The invention relates to the technical field of positioning systems, in particular to an accurate modeling method suitable for regional ionospheric TEC. Background technique [0002] The ionosphere is connected to the outer atmosphere at the top and the middle atmosphere at the bottom. It is an important link and key level connecting the past and the future in the space environment of the sun and the earth. The ionosphere contains a large number of free electrons and ions, which can change the propagation speed of electromagnetic waves passing through it, and reflect or refract, which will have an important impact on various space systems that use radio as a propagation beacon. Therefore, how to effectively eliminate the additional time delay in the ionosphere and improve the service performance of the majority of single-frequency GNSS receiver users is a hot issue studied by scholars at home and abroad. [0003] Since the Global Positioning System (G...

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Problems solved by technology

[0007] In view of this, the present invention discloses an accurate modeling method suitable for regional ionospheric TEC, which can not only provide data support for theoretical research on ionospheric morphology, but also solve problems caused by lack of data for the majority of single-frequency GNSS users. The problem of decreased navigation and positioning accuracy

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