光学线阵相机在轨几何定标平台设计与实现

Design and Implementation of On-orbit Geometric Calibration Platform for Linear Array Camera

文章采用一种基于探元指向角和相机安装角的星载线阵相机在轨几何定标模型,设计了适合于不同几何成像特点的在轨几何定标模式和流程,并对定标过程中的关键技术环节进行了分析说明。在此基础上设计并实现了星载线阵相机在轨几何定标软件,最后选择资源系列卫星数据,利用软件进行了实验验证。实验结果表明,设计和实现的多个模式定标软件能高效、高精度地完成多星、多相机的在轨几何定标任务,具有兼容多模式定标要求、可扩展至其他卫星型号的特点,能够作为统一的在轨几何定标软件平台。

AbstractIn this paper, we adopt an on-orbit geometric calibration model for space-borne optical linear array camera based on the detector’s directional angle and the camera’s installation angle; we design different on-orbit geometric calibration mode and workflow which are applicable to the characteristics of different geometric imaging patterns; we also analyze the key technology in the process of the calibration. On the basis of the above, we have designed and implemented an on-orbit geometric calibration software for space-borne optical linear array camera. Finally, we chose the satellites’ data of ZY series to validate the software. The validation result proves that the multiple modes of calibration software we design and implement can not only complete on-orbit geometric calibration task of multiple satellites and multiple sensors with high efficiency and high precision, but also has the characteristic of compatibility of multiple calibration mode requirements and good extendability to other satellites. This shows that the software proposed in the paper can be used as a unified on-orbit geometric calibration software platform.