Ellipsoidal layered atmospheric refraction-based optical satellite image accurate ground positioning method

Abstract

The invention provides an ellipsoidal layered atmospheric refraction-based optical satellite image accurate ground positioning method. The method comprises the following steps of establishing a corresponding relationship between the height of any global point and an atmospheric refraction index; determining an intersection point of the incident light vector and the reference ellipsoid of the nextlayer according to the light initial point, and determining a refracted light vector on the next layer; gradually reducing the height of the positioning point by finely layering the atmosphere, and iteratively resolving the intersection point of the light ray and the reference ellipsoid until the intersection point is intersected with the real terrain surface to obtain the optical satellite imageaccurate ground positioning point based on ellipsoid layering atmospheric refraction. According to the method, the atmospheric refraction processing is provided, the ground point coordinates are moreaccurate, the layered refraction light vectors under the influence of atmospheric refraction are accurately extracted by calculating the normal vector of the reference ellipsoid at the refraction point, and the method is achieved through an atmospheric fine layering and gradual iterative solution mode, so that implementation is easy and convenient, and the positioning precision is high.

Description

technical field [0001] The invention belongs to the technical field of optical satellite images, and includes a precise ground positioning method for optical satellite images based on ellipsoid layered atmospheric refraction. Background technique [0002] Most of the existing optical satellite direct-to-earth positioning models adopt the collinear equation model without considering the influence of atmospheric refraction [1]; although some consider the influence of atmospheric refraction, they are based on the round earth model instead of the ellipsoid model, or Only the geocentric angle caused by atmospheric refraction is calculated, and the atmospheric stratification is also very rough and unrealistic[2,3]. The positioning model based on ellipsoid layered atmospheric refraction proposed by the present invention overcomes the above shortcomings, and can be used for precise ground positioning of optical satellite images. [0003] references: [0004] [1] Shan Jie. A Brief ...

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Problems solved by technology

[0002] Most of the existing optical satellite direct-to-earth positioning models adopt the collinear equation model without considering the influence of atmospheric refraction [1]; although some consider the influence of atmospheric refraction, they are based on the round earth model instead of the ellipsoid model, or Only the geocentric angle caused by atmospheric refraction is calculated, and the atmospheric stratification is also very rough and unrealistic[2,3]

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