Full-link optical satellite geometrical imaging model construction method and full-link optical satellite geometrical imaging model construction system

Abstract

The invention provides a full-link optical satellite geometrical imaging model construction method and a full-link optical satellite geometrical imaging model construction system. The method comprisesthe following steps: determining a relative motion relation between an imaging exploration element and an observation site object point, and based on relative motion speed of an imaging image point to an observation earth surface, constructing an aberration error correction model of a satellite image light direction; based on an atmospheric subdivision mode, calculating geometrical positioning error caused by multiple layers of atmospheric refraction, obtaining an actual side-view angle of an exploration element light after the atmospheric refraction error is corrected, and based on a side tilt angle and an angle of pitch of updated imaging light under a satellite orbit coordinate system, constructing the atmospheric refraction error correction model of the satellite image light direction; according to the aberration error correction model and the atmospheric refraction error correction model, performing fine treatment for a conventional geometrical model, and constructing a fine geometrical imaging model in which atmospheric refraction and aberration error correction are considered. The model provided by the invention can reflect a mapping relation between the image point coordinate of a high-resolution optical remote sensing satellite image and a ground point coordinate more precisely.

Description

technical field [0001] The invention belongs to the field of aerospace photographic silhouette measurement, and aims at high-resolution optical remote sensing satellites, and relates to a method and system for constructing a full-link optical satellite geometric imaging model. Background technique [0002] At present, the traditional satellite geometric imaging model and geometric calibration model are constructed based on the ideal collinear equation, that is, the image point, the imaging feature point and the projection center satisfy the three-point collinear principle. With the enhancement of satellite mobile imaging capabilities, more and more satellites have agile imaging capabilities. Agile optical satellite imaging has the characteristics of large angle and multiple angles, that is, it has the ability of large-angle imaging from the sub-satellite point ±40-50 degrees and the ability to perform multi-orbit or same-orbit multi-angle continuous imaging for the same sens...

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Problems solved by technology

Related literature "Greslou, D., Lussy, F.D., Montel, J. LIGHT ABERRATION EFFECT IN HR GEOMETRICMODEL[J]. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2008." Correction of vector, literature "Yan, M., et al. Atmosphere Refraction Effects in Object Locating for OpticalSatellite Remote Sensing Images [J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(9):995-1002." on atmospheric refraction The geometric positioning deviation caused by the method has been solved, but both have not refined and corrected the imaging geometric model, and only for one of the errors

Therefore, the scope of application of the two documents is limited to error analysis, and the construction of an optical satellite geometric imaging model that takes into account atmospheric refraction and aberration correction has not been realized, and an effective technical solution to the problem has not been provided.

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