Geometric pretreatment method for vertical rail swing images of satellite-borne linear array sensor

Abstract

The invention discloses a geometric pretreatment method for vertical rail swing images of a satellite-borne linear array sensor. The geometric pretreatment method comprises steps of establishing a collinearity equation model of original single-frame images according to the imaging geometry of the original single-frame images; performing geometric correction treatment on all the original single-frame images, dividing all the original single-frame images into virtual three-dimensional grids, resolving rational polynomial model coefficients corresponding to the original single-frame images, establishing a positive and negative calculation relation of each original single-frame image coordinate and a tangent plane image coordinate, and performing geometric correction on all the original single-frame images on the basis of a rational polynomial model to obtain frame images under an object space tangent plane coordinate, wherein the geometric correction treatment comprises constructing a mutual conversion relation of an object space local coordinate and a geocentric rectangular coordinate and constructing a mutual conversion relation of the tangent plane image coordinate and the object space local coordinate; splicing all the frame images under the object space tangent plane coordinate on the basis of the coordinate to obtain the spliced images; resolving the rational polynomial model coefficients corresponding to the spliced images.

Description

technical field [0001] The invention belongs to the field of aerospace and aerial photogrammetry, and relates to a high-precision geometric preprocessing method of a space-borne linear array sensor in a pendulum-sweep imaging mode. Background technique [0002] Linear array CCD (charge-coupled device image sensor) is currently the main sensor for obtaining high-resolution optical satellite images. In the process of high-resolution optical imaging, the CCD observation field is narrow due to the long focal length of the lens. Using vertical orbit swing-broom imaging instead of along-track push-broom imaging can effectively increase the observation field of view. However, in the vertical orbit sweep imaging method, the imaging relationship is more complicated due to the mirror sweep movement, and the geometric distortion of the obtained image is large, which needs to be solved urgently in high-precision geometric applications. [0003] Conventional line scan images realize sy...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a high-precision geometric preprocessing method for the swing-sweep imaging method of the spaceborne linear array sensor to solve the problem of large internal geometric distortion of the image; moreover, by giving the rational polynomial model of the image , enabling users to use ground control points for subsequent higher-precision geometric processing of images

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