Ionized layer chromatography method and system based on high-orbit satellite-borne SAR system

Abstract

The invention discloses an ionized layer chromatography method and system based on a high-orbit satellite-borne SAR system. The ionized layer chromatography method based on the high-orbit satellite-borne SAR system comprises the following steps: determining a plurality of ground PS points in an area to be inverted; defining a path from a high-orbit satellite-borne SAR to a ground PS point as a ray, and calculating a TEC value on each ray; dividing the to-be-inverted area into a plurality of space grids; calculating an intercept length of each ray in each space grid; and iteratively calculatingan electron density distribution condition of the to-be-inverted area according to a formula, wherein Nejk+1 is an electron density value of a jth space grid after (k+1)th iteration, TECi is a TEC value of an ith ray, Ai is a length of the ith ray, Aij is the intercept length of the ith ray in a jth space grid, lambda k is a relaxation factor, and a value range is 0-1. In the invention, a capability of accurately inverting TEC of an ionized layer in real time in a complex environment can be achieved, and meanwhile accurate inversion of an electron density in a real-time large-range space canbe achieved.

Description

technical field [0001] The invention relates to the technical field of ionospheric chromatography, in particular to an ionospheric chromatography method and system based on a high-orbit spaceborne SAR system. Background technique [0002] The ionosphere will have a serious impact on space remote sensing, satellite communication, navigation and positioning and other fields. Therefore, it will be of great practical significance to accurately obtain real-time three-dimensional distribution data of ionospheric electron density by using modern technology. At the same time, because the ionospheric electron density will undergo major changes before (such as earthquakes) and when natural disasters occur (such as typhoons, volcanic eruptions, tsunamis, etc.), the accurate acquisition of real-time ionospheric electron density data is important in earthquake prediction and observation of meteorological disasters. It has important scientific research and application value in aspects suc...

AI Technical Summary

Problems solved by technology

The current ionospheric tomography methods based on spaceborne SAR all use low-orbit spaceborne SAR data. Due to the long revisit time and small coverage of low-orbit spaceborne SAR, it is impossible to conduct real-time and large-scale electron density reflections for specific regions. play

In addition, in the ionospheric TEC retrieval process, the existing ionospheric TEC retrieval methods based on low-orbit spaceborne SAR data seldom consider the influence of other errors other than the ionospheric delay error

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