Ionized layer chromatography technology and ionized layer delay correction method based on multi-scale subdivision

Abstract

The invention discloses an ionized layer chromatography technology and an ionized layer delay correction method based on multi-scale subdivision. A three-dimensional space of an area ionized layer is subdivided according to different 'pixel' scales to obtain a plurality of different single-scale ionized layer chromatography models, unknown variables of the models are uniformly solved and weighted according to different weight factors to obtain solutions of a multi-scale chromatography model, and electron density distribution of the area ionized layer is reconstructed to obtain delay of the area ionized layer. The space activity rule of the reconstructed ionized layer is high in fitting degree, high in timeliness and convenient to use. According to the obtained area ionized layer, the delay quantity solution result is high in accuracy, so that the application range of CORS measurement results is enlarged. It is proved through a lot of project case application result analysis that the electron density distribution of the area ionized layer reconstructed through the method is more smooth and reasonable compared with a traditional single-scale ionized layer chromatography model, and ionized layer delay correction accuracy is improved by 30% on average.

Description

technical field [0001] The invention relates to an ionospheric tomography technology and an ionospheric delay correction method based on multi-scale subdivision, and belongs to the application field of geodesy and spatial information technology. Background technique [0002] The ionosphere is the upper atmosphere 70-2000km from the earth's surface, mainly composed of the mesosphere, thermosphere and exosphere. However, when satellite signals pass through the ionosphere, a time delay (ionospheric delay) is generated, therefore, the accuracy of satellite navigation and positioning is significantly affected by the ionospheric delay. The ionospheric delay is generally expressed by the ionospheric total electron content (TEC), which is defined as the total number of electrons contained in a column that runs through the entire ionosphere along the signal propagation path when the bottom area is a unit area, that is, along the signal propagation path A linear integral of electron ...

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For the improved iterative reconstruction algorithm, although the calculation efficiency and reconstruction quality have been improved to a certain extent, it st

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