Coordinate back calculation method for TDICCD (time delay and integration charge coupled devices) linear array push-sweep sensor

Abstract

The invention discloses a coordinate back calculation method for a TDICCD (time delay and integration charge coupled devices) linear array push-sweep sensor. The method comprises the following steps of: 1, according to a geometric model M, carrying out back calculation on an object space coordinate Pi (Bi, Li and H0) to obtain a virtual image coordinate (sample i and vline i); 2, computing a raw image line number line i; 3, computing an object space coordinate P' (B' and L') according to an object space elevation H0 in a raw image coordinate p (sample i and vline i) and an object space coordinate true-value P0; and 4, comparing the object space coordinate P' (B' and L') computed in the step 3 with the object space coordinate true-value P0 (B0 and L0) to judge whether iteration end conditions are met or not, and if so, outputting the raw image coordinate p (sample i and line i), otherwise, enabling i to be equal to i+1, computing the object space coordinate Pi which is equal to P0*2-P', and returning to continue iteration.

Description

technical field [0001] The invention belongs to the field of aerospace and aerial photogrammetry, and relates to a high-precision coordinate inversion method based on a virtual image line number when using a collinear equation model of a TDICCD linear array push-broom sensor to inversely calculate image-space coordinates from object-space coordinates. Background technique [0002] TDICCD (Time Delay Integral Charge Coupled Device) is currently the main sensor for obtaining high-resolution optical satellite images. The line integration time of TDICCD can be adjusted in real time during the push-broom imaging process, which on the one hand compensates for image movement, making the definition of TDICCD images better than traditional CCD (charge-coupled device) images; on the other hand, it also makes line array sensors The smoothness of the collinear equation model decreases, which makes the fitting accuracy of the rational polynomial model insufficient, or the iteration does ...

AI Technical Summary

Problems solved by technology

When the TDICCD line integration time jumps, the smoothness of the collinear equation model of the line array sensor will be greatly reduced, and the fitting accuracy of the geometric model M (including rational polynomials and three-dimensional polynomials) will also be reduced, and finally the coordinate inversion accuracy will be reduced. Can not meet the use requirements

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