A Method of Correcting Atmospheric Refraction for Optical Imaging Satellites Using Stellar Observation Data

Abstract

The invention relates to a method for correcting atmospheric refraction of an optical imaging satellite through utilizing fixed star observation data and belongs to the technical field of remote sensing image processing. The method comprises steps that S1, an atmospheric layering model is established according to a light wave band of an observed satellite image; S2, a fixed star light refraction model is established, and the atmospheric refractive index is calculated through utilizing the observed fixed star deflection phenomenon and the layer-by-layer forward iterative algorithm; S3, the deflected fixed start light is corrected through the fixed star light refraction model and the atmospheric refractive index, and the atmospheric refractive index is updated through the correction result;and S4, the fixed star light refraction phenomenon is predicted through the fixed star light refraction model, the coplanar nature of a satellite and the updated atmospheric refractive index. The method is advantaged in that the atmospheric refractive index is estimated based on the observed fixed star deflection phenomenon, volatility characteristics of the atmospheric refractive index can be better reflected, and the method can further be used in the case where a satellite observation space target is refracted twice by the atmosphere.

Description

technical field [0001] The invention relates to a method for correcting atmospheric refraction of an optical imaging satellite by using star observation data, and belongs to the technical field of remote sensing image processing. Background technique [0002] In recent years, optical imaging satellites have always been the focus of research in various countries due to their advantages such as wide observation area, less subject to national boundaries, and less susceptible to electromagnetic interference. In optical imaging satellite observation, stars are relatively fixed in their positions. It plays an important role in the calibration and positioning of stars and in the navigation process, and the extraction and position determination of stars are often the focus of research. [0003] However, in existing optical imaging satellite observations, the deflection of star light due to atmospheric refraction is often not considered, so stars are mistakenly regarded as the monito...

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Problems solved by technology

[0003] However, in existing optical imaging satellite observations, the deflection of star light due to atmospheric refraction is often not considered, so stars are mistakenly regarded as the monitoring target, resulting in a waste of monitoring resources. , because the phenomenon of atmospheric refraction is not considered, it is impossible to track the stars when they just appear, thus reducing the effect of stargazing

[0004] In addition, the previous atmospheric refraction methods often focus on the atmospheric refraction modeling of ground targets or the atmospheric refraction modeling of ground-to-air targets, that is, only focus on the refraction of light passing through a layer of atmosphere, while for satellite observation of stars Or the case of a space target that has undergone double refraction is not discussed

[0005] At the same time, in the modeling of atmospheric refractive index, the classical atmospheric refractive index calculation formula is generally related to the pressure, temperature, and atmospheric density at the current location, and is not a function that simply depends on the height. Therefore, if only the classical atmospheric refractive index is used The calculation method based on the height model can only reflect the general situation of the atmospheric refractive index in a long period of time, but cannot reflect the characteristics of the short-term fluctuation of the atmospheric refractive index with the change of the air flow

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