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%.