On-orbit geometric calibration method and system for multi-camera optical push-broom satellites

Abstract

Disclosed is an on-orbit geometric calibration method and system of a multi-camera optical push-broom satellite. The method includes: subjecting each camera to stepwise internal and external calibration to acquire internal and external calibration parameters of the cameras; using a field control point as an orientation point, re-calculating the external parameters of the cameras on the basis of least-squares adjustment, and determining a multi-load mounting angle relation; for the camera, serving as a main load, re-calculating the external calibration parameter on the basis of least-squares adjustment with global multi-calibration field data as the orientation point, and converting the external calibration parameter into a corresponding final mounting matrix; according to the mounting angle relation, solving final mounting matrixes of other auxiliary loads to obtain the final external calibration parameters of the cameras. According to the imaging feature of the multi-camera optical push-broom satellite, the mounting relation of the multiple loads is fully considered, high-precision geometric calibration of the multi-camera push-broom satellite is achieved, and the relative geometric precision of following multi-view stereo images is improved.

Description

technical field [0001] The invention belongs to the field of geometric processing of remote sensing images, and relates to a multi-camera optical push-broom satellite on-orbit geometric calibration method and system. Background technique [0002] On-orbit geometric calibration of satellites is a key link for high-resolution optical remote sensing satellites to achieve high-precision geometric positioning, which directly affects the geometric quality of satellite images. Although the satellite will undergo strict laboratory calibration before launch, due to factors such as vibration during launch, changes in imaging conditions during in-orbit operation, and aging of devices, the geometric imaging parameters of the satellite will change. It cannot meet the needs of high-precision geometric processing, so on-orbit calibration of satellites is required. [0003] At present, a lot of research and practical work have been carried out on the geometric calibration of close-range ca...

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to construct a suitable joint geometric calibration model and method according to the structure and imaging characteristics of the multi-line array push-broom camera, but there is a lack of relevant research results in this field.

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