基于温度修正的GF-5全谱段光谱成像仪热红外谱段辐射定标  

Radiation Calibration of Thermal Infrared Bands of GF-5 VIMI Based on Temperature Correction

作　　者：王浩[1,2] 晋利兵[1,2] 李岩 赵艳华[1] WANG Hao;JIN Libing;LI Yan;ZHAO Yanhua(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China;Key Laboratory for Space-Based Target Monitoring Technology of CAST,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094 [2]中国空间技术研究院天基空间目标监视技术核心专业实验室,北京100094

出　　处：《红外技术》2020年第6期547-551,共5页Infrared Technology

基　　金：国家重大科技专项工程。

摘　　要：针对GF-5全谱段光谱成像仪热红外谱段存在响应异常、辐射定标精度难以保障的问题,开展了地面辐射定标补充试验,发现热红外谱段响应对仪器内部温度、焦面温度变化敏感是导致异常现象的主要原因。进一步对相机输出信号值随仪器内部温度、焦面温度变化规律进行了分析总结,提出了基于仪器温度、焦面温度修正的绝对辐射定标算法,成功应用于全谱段光谱成像仪热红外谱段的实验室绝对辐射定标,结果表明定标不确定性为1.36%。Owing to the abnormal response of the thermal infrared bands of the visible infrared multi-spectral imager(VIMI)aboard GF-5 satellite it is challenging to guarantee the radiometric calibration accuracy;considering this fact,we conducted a supplementary test of ground radiometric calibration.We obtained that the response sensitivity of the thermal infrared bands to the change of instrument cavity temperature and the focal plane temperature was the main reason for this abnormal phenomenon.Furthermore,we analyzed and summarized the law of output signal changing with instrument cavity temperature and focal plane temperature.An absolute radiation calibration algorithm based on instrument temperature and focal plane temperature revise was proposed.It was successfully applied to laboratory absolute radiation calibration of thermal infrared bands of VIMI.The results show that the uncertainty of calibration is 1.36%.

关 键 词：高分五号 绝对辐射定标 热红外遥感 HGCDTE探测器 温度修正 

分 类 号：V443.5[航空宇航科学与技术—飞行器设计]