基于FY-2C的大口径空间相机辐射定标研究

Radiometric calibration of large entrance pupil space telescope

摘要: 针对目前国内外热点研究的大口径空间相机，分析了其较之普通口径相机在辐射定标方面所具有的特点和难点。在FY-2C星红外水汽波段实验室辐射定标方法的基础上，提出了一种改进的适用于大口径空间相机的新型辐射定标方案。该方案克服了传统黑体准直括束系统的定标方法中存在的括束系统视场、口径必须与空间相机参数匹配的难点，通过改进的后端光路插入黑体方法，实现了任意口径空间相机的全光路辐射定标。最后通过对新方案的辐射定标不确定度分析，论证了新方案在定标精度等方面的优势。

Abstract: A study on the radiometric calibration of large entrance pupil space telescope is made. After analyzing the difficulties on this work, a new calibration method based on the improved on-board blackbody source calibration in FY-2C is put forward. This new method overcomes the limitation in field of view and diameter of the entrance pupil; and it realizes the full light path calibration to telescope with any possible entrance pupil. Finally, based on the uncertainty analysis of the new method, the advantages of the new method are given.