Edge-enhanced ionized layer chromatography method

Abstract

The invention provides an edge-enhanced ionosphere chromatography method. The method comprises the following steps: step 1), jointly resolving a measured ionosphere TEC by using a GPS code observation value and a carrier phase observation value; step 2), establishing a virtual reference station, and calculating a virtual TEC value through triangular linear interpolation; 3) uniformly dividing the to-be-inverted region into grids according to the longitude, latitude and height directions, calculating the intercept of all observation signals in each grid, and arranging the observation signals according to the sequence of the grids and the observation times to form an observation matrix A; 4), adopting an IDW interpolation method as a horizontal constraint, and enabling the grids through which no signal rays pass to participate in chromatography iteration; and 5), constructing an edge function, and solving ionosphere electron density distribution through an ART iterative algorithm. According to the method, the situation of marginal area observation signal scarcity in actual inversion is fully considered, correction weighting is carried out on the ART algorithm to limit correction on the marginal area, and over-fitting is prevented.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to an edge-enhanced ionospheric tomography method. Background technique [0002] The ionosphere refers to the space atmosphere about 50 kilometers to 1,000 kilometers above the ground. The molecules of the earth's atmosphere in this range are ionized due to the interaction between the ultraviolet radiation of the sun and the high-speed particles in the upper atmosphere of the earth, molecules, and cosmic rays. Generates a large number of free electrons and ions. [0003] The ionosphere is an important part of the sun-earth system and an important part of the near-Earth space environment where human beings live, and has a very important impact on human production and activities. On the one hand, under normal circumstances, the reflection of the ionosphere is conducive to the realization and development of long-distance radio communication; Aerospace and satellite navigation and ...

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Problems solved by technology

[0006] Due to the aforementioned reasons, in the actual tomographic process, there are many grids without any observation signal passing through, which makes the inversion become a serious ill-conditioned problem, especially in the edge area of ​​the area to be inverted, compared with the central area, the observation value is relatively small. less, the traditional ART algorithm can no longer be well applied, too many unknowns reduce calculation efficiency, and over-fitting often occurs in marginal areas, making it difficult to achieve high-precision and high-efficiency ionospheric electron density retrieval

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