Ionized layer tomography method for improving iteration initial value precision

Abstract

The invention relates to an ionosphere tomography method for improving the precision of an iteration initial value, computer equipment and a computer readable storage medium. The method comprises steps of segmenting an ionosphere region into a plurality of grids, and determining the coordinate and the electron density initial value of each grid; a plurality of vertical measuring instruments being arranged below the ionosphere area at intervals, and the vertical measuring instruments being combined with satellite-borne full-polarization SAR data to determine the vertical electron density of a plurality of different points; updating an electron density initial value of the corresponding grid; acquiring a plurality of rays of different paths by using a GPS (Global Positioning System) and inverting a TEC value corresponding to each ray; calculating the projection length of each ray in each grid; and performing tomography iteration inversion based on a multiplication algebraic reconstruction method, and obtaining the electron density distribution of the ionized layer region after multiple iterations. According to the method, ionosphere IRI empirical model data is corrected by using the vertical measuring instrument and the satellite-borne full-polarization SAR data, so authenticity of an iteration initial value is improved, and ionosphere tomography precision can be improved.

Description

technical field [0001] The invention relates to the technical field of radar detection, in particular to an ionospheric tomography method for improving the accuracy of an iterative initial value, computer equipment and a computer-readable storage medium. Background technique [0002] The ionosphere is an important part of the solar-terrestrial space environment, which can have a significant impact on low-frequency signals passing through it, such as global navigation system (GPS) signals. But at the same time, because the signal contains a wealth of ionospheric information, ionospheric detection based on GPS signals has become the most widely used ionospheric detection technology. Ionospheric tomography (CIT) based on GPS signals can receive the echo information through the receiving station on the ground, invert the total electron content (TEC) of the path, and then solve the electron density distribution inside the ionosphere through iterative calculations . [0003] The...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the reliability of the iterative initial value determined by the ionospheric tomography method based on the ionospheric IRI empirical model in the prior art is relatively poor, resulting in low accuracy of electron density measurement

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