发表机构
Kyung Hee University; Korea Astronomy and Space Science Institute（庆熙大学; 韩国天体物理与空间科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文针对韩国达努里号月球轨道器上的广角偏振相机（PolCam），介绍其在轨数据的综合辐射校准流程，包括暗电流去除等。通过算法减轻原始数据拖影伪像，恢复数据质量，给出偏振测量示例验证校准性能，为后续定量分析做准备。
AI 中文摘要
韩国首个月球轨道器达努里号于2022年8月5日发射，已成功运行其两年的标称任务阶段。搭载的广角偏振相机（PolCam）是首个从月球轨道进行全球偏振观测的仪器。本文介绍了用于PolCam在轨数据的综合辐射校准流程，包括暗电流去除、拖影校正和平场校正。PolCam原始数据存在严重拖影伪像，通过严格校正算法有效减轻，恢复数据质量以用于科学分析并便于精确推导线性偏振度（DoLP）。最后给出偏振测量示例验证校准性能，虽当前校准聚焦定性科学分析的数据质量恢复，但结果表明了强度与偏振之间的预期反比关系。定量DoLP分析所需的绝对光度校准留待后续发表。
英文摘要
Danuri, South Korea's first lunar orbiter, was launched on 2022 August 5, and has completed its two-year nominal mission phase. The wide-angle Polarimetric Camera (PolCam) onboard Danuri is the first instrument to conduct global polarimetric observations from lunar orbit. This paper presents the image artifact correction pipeline for PolCam's on-orbit data. It encompasses the primary steps of the radiometric calibration, consisting of dark current removal, smear correction, and flat-fielding, except for inter-channel relative response and the final radiance calculation. Notably, PolCam's raw data exhibit severe smear artifacts induced by the frame-transfer CCD architecture, which degrade both radiometric fidelity and the accuracy of polarimetric measurements. These smear artifacts have been mitigated through a rigorous correction algorithm, restoring data quality to a level sufficient for scientific analysis and facilitating the precise derivation of the degree of linear polarization. These steps serve as an essential prerequisite for conducting subsequent absolute radiance and photometric calibrations. Finally, we present representative examples of polarimetric measurements to validate the calibration performance. Although the current calibration focuses on restoring data quality for qualitative scientific analysis, these results demonstrate the expected inverse linear relationship between intensity and polarization.
Comments19 pages, 13 figures, 3 tables, accepted for publication in PASP
