海洋一号C卫星海岸带成像仪在轨几何定标
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1.武汉大学国家网络安全学院;2.国家卫星海洋应用中心;3.武汉大学测绘遥感信息工程国家重点实验室

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On-orbit geometric calibration of HY-1C CZI
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1.School of Cyber Science and Engineering,Wuhan University;2.National Satellite Ocean Application Service,Beijing;3.State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University

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    摘要:

    海洋一号C卫星(HY-1C)搭载的海岸带成像仪(CZI)为满足大幅宽成像需求,采用双相机组合成像,每台相间使用两片四色CCD器件拼接。本文从严密几何成像模型出发,对相机成像过程中存在的系统误差进行分析,采用了一种基于探元指向角的几何定标模型,并结合CZI相机设计特点与几何特性,设计了一套针对于HY1C/CZI的几何定标方案。首先利用CZI参考基准波段影像与高精度参考影像进行绝对几何定标,采用分步迭代的方法对参考基准波段影像内外定标参数进行解算,最后进行波段间相对几何定标,得到所有波段影像的几何定标结果。实验结果表明,经在轨几何定标后,平面无控定位精度优于5个像元,影像几何质量得到明显改善,说明本文所采用的定标模型和方案合理有效。

    Abstract:

    In order to meet the requirements of wide-width imaging, Coastal Zone Imager (CZI)adopts the combination of two cameras for imaging, and splices two four-color CCD devices between single phase. Based on the rigorous geometric imaging model, this paper analyzes the systematic errors existing in the imaging process of the camera, adopts a geometric calibration model based on the directional angle of probe, and designs a geometric calibration scheme for the CZI camera based on the design of camera characteristics and geometric characteristics. CZI reference band image and high-precision reference image are carried out to absolute calibration, internal and external calibration parameters of reference band image are calculated by step iterative method. According to the bands’ constraint relation, calibration results of non-reference band image are obtained by relative calibration between bands. The experimental results show that the geometric quality of the image is obviously improved, and the positioning accuracy of plane-free control points is better than 6 pixels after on-orbit geometric calibration, which indicates that the calibration model and scheme adopted in this paper are reasonable and effective.

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文章历史
  • 收稿日期:2022-04-20
  • 最后修改日期:2022-10-12
  • 录用日期:2023-02-17
  • 在线发布日期: 2023-07-18
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