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

An ionospheric and spaceborne technology, applied in the field of ionospheric tomography, can solve the problems of long revisit time, small coverage, and inability to invert electron density in specific areas of low-orbit spaceborne SAR.

Inactive Publication Date: 2020-04-28
CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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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 re...

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

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[0065] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0066] Such as figure 1 As shown, the ionospheric tomography method based on the high-orbit spaceborne SAR system according to the embodiment of the present invention includes:

[0067] S1, determine multiple ground PS points in the area to be inverted; the "ground PS points" here can be understood as high reflection points on the ground.

[0068] S2, defining the path from the high-orbit spaceborne SAR to the PS point on the ground as a ray, ...

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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...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张龙田野李博骁
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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