Infrared Technology, Volume. 42, Issue 6, 547(2020)
Radiation Calibration of Thermal Infrared Bands of GF-5 VIMI Based on Temperature Correction
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%.
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WANG Hao, JIN Libing, LI Yan, ZHAO Yanhua. Radiation Calibration of Thermal Infrared Bands of GF-5 VIMI Based on Temperature Correction[J]. Infrared Technology, 2020, 42(6): 547
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Received: Apr. 3, 2019
Accepted: --
Published Online: Jul. 16, 2020
The Author Email: Hao WANG (wanghao9490@163.com)
CSTR:32186.14.